Hydrogeomorphology
Mohammad Hossein Rezaei Moghaddam; Davoud Mokhtari; meysam skandarialni
Abstract
Hydrological models are an effective tool for managing water resources as well as water balance components among research works. Today, basin hydrological models have been developed, but choosing the right model to simulate a specific basin has always been a challenge. Therefore, it is necessary to choose ...
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Hydrological models are an effective tool for managing water resources as well as water balance components among research works. Today, basin hydrological models have been developed, but choosing the right model to simulate a specific basin has always been a challenge. Therefore, it is necessary to choose a model that can simulate the hydrological processes with the simplicity of the structure and using minimal factors. Northwest Iran was simulated by AWBM and SWAT models. The AWBM model is an integrated model that simulates the runoff in catchment areas using two variables, rainfall and evaporation, and on the other hand, the SWAT model is a continuous and semi-distributed model that simulates hydrological processes using the physical characteristics of the basin (soil, land use, slope) as well as several water and meteorological information such as rainfall, temperature. The results of runoff simulation in the calibration and validation periods were evaluated using two Nash Sutcliffe statistical indices (NSE) and R2 coefficient of determination. By comparing the results of the statistical indicators used in the study, it was found that the SWAT model has better results in the simulation of monthly runoff in the validation and validation periods.
Hydrogeomorphology
Mohammad Hossein Rezaei Moghaddam; Davoud Mokhtari; Tohid Rahimpour; Vahideh Taghizadeh Teimourloei
Abstract
Azarshahrchai catchment area, located on the western slope of the Sahand mountain range, is formed by the connection of numerous tributaries flowing in deep valleys, and every year in the spring season, with the onset of rains, floods occur in these valleys. The purpose of this research is to evaluate ...
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Azarshahrchai catchment area, located on the western slope of the Sahand mountain range, is formed by the connection of numerous tributaries flowing in deep valleys, and every year in the spring season, with the onset of rains, floods occur in these valleys. The purpose of this research is to evaluate the performance of the weighted evidence (woe) function for preparing the flood susceptibility map of the Azarshahr Chai catchment area. In order to reach the mentioned goal, first, the location of 82 flood catch points using Landsat8.c2.l2 satellite images based on the flood of April 2016 was randomly divided into two groups of 70% (57 flood catch points) for training data and 30 percent (25 points) flood) was used for validation data. Then 14 effective factors in flood occurrence elevation, slope, Aspect, slope curvature, distance to river, distance to road, river density, TWI (topographic moisture index), lithology, soil type, rainfall, and NDVI in Arc software environment and land use in ENVI5.3 software environment, analysis, and location of flood catch points in all 14 factors were investigated. The ROC operating characteristic curve was used to validate and correct the results obtained. The results of the research indicate that 19.56% of the basin is in the very high sensitivity class, 19.18% in the high sensitivity class, 24.61% in the moderate class, 21.94% in the low class and 14.68% in the shallow class in terms of flood vulnerability.
Hydrogeomorphology
Abazar Esmali Ouri; Shokrollah Asghari; Arezoo Eshaghzadeh; Raoof Mostafazadeh
Abstract
Determining the extent of riverbank erosion and displaying it as a map in a GIS environment is effective in the optimal management of water and soil resources. The aim of the current research is to delineate the riverbank erosion zone from aerial photographs, perform regression modeling, and identify ...
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Determining the extent of riverbank erosion and displaying it as a map in a GIS environment is effective in the optimal management of water and soil resources. The aim of the current research is to delineate the riverbank erosion zone from aerial photographs, perform regression modeling, and identify factors influencing the development of riverbank erosion using various spatial data including physiographic, hydrological, geological, and environmental data in different sections of the Balikhlouchai River in Ardabil Province. Initially, influential parameters in riverbank erosion in the region, including topographic, soil and land factors, hydrology, and land use changes, were calculated. Accordingly, the variables under study were obtained for four time periods: 1955 using aerial photographs, 1980 using TM satellite images, and years 2010 and 2013 using Google Earth images, and the effective extent of riverbank erosion was compared. Subsequently, multivariate regression analysis was performed using independent variables (including topographic, hydrological, soil erodibility, and land factors) and the effective extent of riverbank erosion as the dependent variable, using SPSS software, and suitable models were developed to estimate the amount of different riverbank erosion. Based on the results of regression analysis, environmental parameters such as slope of the river reaches, peak discharge, area under irrigated agriculture, concentration time, pasture coverage, and residential areas played a more significant role in exacerbating riverbank erosion.
Hydrogeomorphology
Hamid Amoonia; Mohammadreza Yousefi Roshan; Mohammad Dِaymevar
Abstract
Gorgan Bay, one of the most important wetlands in northern Iran, has experienced significant water level fluctuations with severe environmental consequences for surrounding areas. This study employs a comparative analysis of spectral water indices to monitor water level changes in Gorgan Bay. Previous ...
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Gorgan Bay, one of the most important wetlands in northern Iran, has experienced significant water level fluctuations with severe environmental consequences for surrounding areas. This study employs a comparative analysis of spectral water indices to monitor water level changes in Gorgan Bay. Previous studies have documented substantial water level variations, leading to substantial ecological and economic losses, highlighting the urgent need for effective management strategies. The present research utilizes Landsat 5 and 8 images to investigate water level changes in Gorgan Bay through a comparative assessment of spectral water indices (NDWI, MNDWI, AWEI, and NDPI). The findings reveal that MNDWI outperforms other indices, with an average RMSE of 21/66, for water extraction from Landsat imagery. MNDWI-derived water area estimates indicate an increase of 2384 hectares between 1990 and 2000, a decrease of 1488 hectares between 2000 and 2010, and a further decrease of 11080 hectares between 2010 and 2020. The alarming 11080-hectare decline in water area from 2010 to 2020 underscores the need for intensified efforts in Gorgan Bay's water level monitoring and management. This study emphasizes the potential of satellite imagery and spectral water indices, particularly MNDWI, as valuable tools for effective water level monitoring and management in Gorgan Bay. The results can serve as a scientific guide for managing and planning water level changes in Gorgan Bay.
Hydrogeomorphology
mohsen rezaei; maryam zare
Abstract
Among the types of environmental hazards, flood is one of the most destructive natural disasters that causes a lot of damages and injuries. Therefore, it is very important to identify the potential areas of flood risk to reduce the damages caused by it. Using morphometric indices and AHP and ANP methods, ...
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Among the types of environmental hazards, flood is one of the most destructive natural disasters that causes a lot of damages and injuries. Therefore, it is very important to identify the potential areas of flood risk to reduce the damages caused by it. Using morphometric indices and AHP and ANP methods, this research seeks to identify flood vulnerable areas in the sub-basins of the Kashf Roud watershed. For this purpose, 16 morphometric indices include: basin area, basin perimeter, waterway length, basin length, shape factor, branching ratio, drainage density, roundness ratio, elongation ratio, tissue ratio, waterway frequency, shape index, maintenance index. The watercourse, basin elevation, elevation ratio, and elevation number were extracted from the DEM of the region, and the flood risk of all sub-basins was determined using two methods, AHP and ANP, and classified into five flood classes: very high, high, medium, low, and very low. were classified The comparison results of AHP and ANP methods were evaluated using Spearman's correlation and checking the percentage of changes. Finally, it was found that the ANP method is more effective in preparing the flood map of the basin. According to the results of this method, 24.3% of the basins are in the very high flood class and 25.7% are in the high class, and in total, more than 50% of the basins are in the high and very high flood class.
Hydrogeomorphology
Gholamreza Khosravi; Mehdi Teimouri
Abstract
It is necessary to examine all the components at different spatial and temporal scales to describe and evaluate all the complexities to develop river ecosystem management plans. In this regard, a key step is hydromorphological characterization, looking at rivers from a perspective that discloses the ...
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It is necessary to examine all the components at different spatial and temporal scales to describe and evaluate all the complexities to develop river ecosystem management plans. In this regard, a key step is hydromorphological characterization, looking at rivers from a perspective that discloses the relevant processes and forms. The aim of this study is to classify, evaluate, and determine the hydromorphological condition of the Khormarud River in Golestan province, Iran, by employing the integrated application of the MQI and MQIm indices. In the first step, using remote sensing and GIS, the main characteristics studied at the geographical scale and used to determine the hydromorphological status of reaches by MQI and MQIm methods. Based on the analysis of MQI, 15 reaches are placed in very poor and poor classes. In contrast, nine and two reaches are placed in moderate and good classes, respectively. The difference among MQI index values across the reaches is significant at 5% level. In addition, the difference among MQIm index values for the two periods, before and after human interventions, in the investigated reach is significant at 5% level. For most reaches, the lowest scores are related to the indicators of vegetation, functional, morphology, and stream changes, respectively. Both the MQI and MQIm morphological evaluation indices are used in different time scales, so they can be considered as complements and not substitutes for hydromorphological condition assessment. By integrating the MQI and MQIm indices, a more comprehensive view of the hydromorphological condition can be gained,
Hydrogeomorphology
Masoumeh Rajabi; Fatemeh Rangraz Forough
Abstract
There are various types of tourism depending on the motivation for travel, one of which is health tourism. Health tourism has grown significantly in recent years due to the spread of machine life and psychological pressures. This type of tourism includes individuals and groups who travel for medical ...
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There are various types of tourism depending on the motivation for travel, one of which is health tourism. Health tourism has grown significantly in recent years due to the spread of machine life and psychological pressures. This type of tourism includes individuals and groups who travel for medical treatment, such as using mineral and warm waters, spending time in recovery, and so on. As one of the natural resources, hot springs are a part of health tourism that are used to treat various medical conditions. The current research focuses on the hot springs of East Azerbaijan province. The study is descriptive-analytical in terms of methodology and applied in terms of purpose. Due to its geographical location, climatic features, and geological and tectonic conditions, East Azerbaijan province is considered one of the important centers of hot springs, which are concentrated around Sahand mountain and Bozgoush mountain range in the northeast of Kalibar. This research uses the Comanescu method, library research, Internet-based surveys, documentary studies, and surveys of 20 experts from the Regional Water Organization and the Provincial Tourism Department, Motalleq Hot Springs, Bostan Abad, Asbforoushan, Allah. Haq, Isti Su Liqvan, Yel Sui, Top Tapan, and Dash Alti were selected and evaluated. The results revealed that the Motalleq Hot Spring, with a total score of 86, has the highest score among the eight selected springs. The Asbforoushan hot spring comes in second with 84 points, the Yel Sui hot spring comes in third with 82 points.
Hydrogeomorphology
Aghil Madadi; sayyad Asghari Saraskanrood; Hossein Hajatpourghaleroodkhany
Abstract
Monitoring of land use changes and destruction of vegetation as one of the dominant parameters in soil erosion is one of the important issues for assessment and control in natural resource management. The Hyrcanian forests of Gilan province, over the past years, have deteriorated due to neglect and have ...
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Monitoring of land use changes and destruction of vegetation as one of the dominant parameters in soil erosion is one of the important issues for assessment and control in natural resource management. The Hyrcanian forests of Gilan province, over the past years, have deteriorated due to neglect and have taken on a different face. So; The purpose of this research is to reveal the changes in land use and the destruction of forest cover and its effects on soil erosion in the watershed of Ghaleroodkhan Fuman. For this purpose, the changes in land use that took place between 1371 and 1402 were extracted using Landsat images and object-oriented classification techniques and were classified (agriculture, forest, pasture, water, and residential). In the next step, by identifying the effective factors in the erosion of the area and preparing the information layers of each criterion in GIS, the standardization of the layers was done using the fuzzy membership function, the weighting of the criteria using the CRITIC method and the final modeling was done using the MARCOS multi-criteria analysis method. The study of the changes in watershed use shows that the forest cover in 1992, with an area of 222.17 square kilometers, had the largest area among the land uses, and in 2023, its area decreased to 205.03 square kilometers. Also considering the results; Residential use with an increase of 27.17 square kilometers has changed the most during the 30 years of study. According to the erosion zoning map, respectively; The area of the floor with very high and high erosion potential has increased from 18.04 and 31.05 percent in 1992 to 22.52 and 32.34 percent in 2023. According to the obtained results, it is possible to reduce the forest cover and convert it into residential areas, agricultural lands, and pastures, as well; He considered the conversion of agricultural lands to residential areas and the increase of residential and agricultural use in the boundaries and riverbeds as the most important factors involved in increasing the soil erosion potential of the basin.
Hydrogeomorphology
Fariba Karami; Davoud Mokhtari; Farnush Ahmadi
Abstract
The aim of this study is to estimate the rate of soil erosion and its relationship with landforms of Zonuzchay catchment in Marand city. In this study to estimate the rate of soil erosion and sediment production, the modified global model of soil loss (RUSEL), geographic information system (GIS) and ...
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The aim of this study is to estimate the rate of soil erosion and its relationship with landforms of Zonuzchay catchment in Marand city. In this study to estimate the rate of soil erosion and sediment production, the modified global model of soil loss (RUSEL), geographic information system (GIS) and remote sensing (RS) was used. To implement the model, rainfall erosivity factors (R), soil erodibility factor (K), slope length-gradient factor (LS), support practice factor (P), and cover-management factor (C) in Arc GIS environment calculated and Then a soil erosion map was drawn. Topographic position index (TPI) was used to classify and map the landforms of the basin. Then, the role of different landforms in relation to soil erosion rates was investigated by combining relevant maps. The results showed that the values of soil erosion in Zonuzchay basin vary between 0 and 50.20 tons per hectare per year. Valleys and cuts located on heights and slopes have the highest rate of erosion and low-slope domains and flat areas and plains include areas with low and very low erosion. In Zonuzchay basin, soil erosion is mostly on the builders of Flysch type deposits, red and gray conglomerates with Marny layers and alluvial terraces. Investigation of regression relationships between (RUSLE) model factors and soil erosion of Zonuzchay basin showed that the slope length-gradient factor has the greatest effect in calculating the rate of erosion of Zonuzchay basin. .
Hydrogeomorphology
hasan Setayeshi Nasaz; sayyad Asghari Saraskanrood; Raoof Mostafazadeh; Aghil Madadi
Abstract
Rivers are very important in terms of human uses and ecological functions. In the present research, the environmental flow components of the Khiavchai River have been determined. Therefore, changes in the EFCs were determined using IHA software. According to the results, the values of low flows were ...
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Rivers are very important in terms of human uses and ecological functions. In the present research, the environmental flow components of the Khiavchai River have been determined. Therefore, changes in the EFCs were determined using IHA software. According to the results, the values of low flows were high in the first period (1988 to 2017), but decreased in recent periods. Also, the decrease in the discharge values of the maximum flow indicators and the increase in the number of days with zero discharge to the number of 174 days were also caused by the change of the river regime. The amount of peak rate and decline rate components has increased in recent periods. The values of low flow duration indicators and low flow frequency have increased. Based on the change of flow dispersion index, the occurrence of strong or very low flows in the river has been intensified. According to the FDCs, in the early periods of the river flow regime, river flow was higher than 0.01cms during the year, while in recent periods it has decreased to less than 0.001cms. Based on the changes in the duration of the flow in recent periods, the duration of the river has changed to 50-60% of the days of the year with a very low discharge. Overuse of river flow changes in the flow regime, and successive droughts have increased the severity of the change in the flow regime and the deviation of the river conditions from the normal state.
Hydrogeomorphology
Alireza Ildoromi; Mehdi spehri
Abstract
In this researchlandslide sensitivity was zoned using statistical models intheKurdistan Dam watershed and the most appropriatemodel was introduced.First, the studied area was determined and with field observations, the number of 9 landslides was recorded and a landslide distribution map was prepared. ...
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In this researchlandslide sensitivity was zoned using statistical models intheKurdistan Dam watershed and the most appropriatemodel was introduced.First, the studied area was determined and with field observations, the number of 9 landslides was recorded and a landslide distribution map was prepared. In the next step, the factors affecting the occurrence of landslides including geology, rainfall, land use, distance from the river, distance from the fault, slope and height were identified and then a map of these factors was prepared. To determine the rateof each of the effective factors in the occurrence of landslides, the map of each information layer of the effective factors is integrated with the distribution map of the landslide and using AHP, BWM and FUCOM statistical modelsseparate information layers are weighted and By overlapping different layers, the final landsliderisk zoning mapswere prepared and compared.The results showed that land use in AHP and BWM methods and rainfall lines, in addition to land use inFUCOM method have the greatest effect and the criteria of heightdistance from the fault and slope respectively in the three AHP, BWM and FUCOM methods have the least effect on the occurrence of landslidestheresults showed that the lithological variable has a great role on the occurrenceof landslides in the studied area.In generalthe results showed that in AHP and BWM methods, the numberof required pairwise comparisons increases significantly with the number of compared parameters, and in this case, the uncertaintyof opinions increases, which shows the superiority of the FUCOM method over It showswell in other ways.
Hydrogeomorphology
Mohammad Hossein Rezaei Moghaddam; Fariba Karami; Kolson Abazari
Abstract
Floods are one of the most destructive natural disasters that cause huge and frequent human losses ,financial and resource losses all over the world(Mishra & Sinha, 2020,1). Flash floods are caused by heavy rains and due to the sudden accumulation and release of runoff from upstream to downstream. ...
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Floods are one of the most destructive natural disasters that cause huge and frequent human losses ,financial and resource losses all over the world(Mishra & Sinha, 2020,1). Flash floods are caused by heavy rains and due to the sudden accumulation and release of runoff from upstream to downstream. This natural phenomenon is the result of the activity of two groups of different parameters. The first group is the meteorological features that change according to space and time. The second group of fixed parameters includes geomorphological and geological characteristics(Youssef et al, 2011,755).Therefore, identification and zoning of areas prone to flood risk is necessary for sustainable development planning and protection of human societies(Farhan & Ayed, 2017, 719). The Ojan Chai basin, which has been flooded in recent years, especially due to human intervention in basin system. One of the most unprecedented floods occurred in this basin in 2016. Therefore, according to the history of flooding in this basin, it is necessary to assess and zoning the risk of sudden flood. The aim of the current research is to evaluate and zoning flash flood-prone areas in the basin based on physiographic characteristics, which is the basis of the modified flash flood potential index (MFFPI).
Hydrogeomorphology
ali abdolmaleki; amjad maleki; ali khazai
Abstract
In addition to damaging structural effects, earthquakes also have adverse environmental effects, including polluting water resources. In this article, the quality changes of surface water resources due to earthquakes are monitored. In the present research, in order to achieve the above goal, by using ...
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In addition to damaging structural effects, earthquakes also have adverse environmental effects, including polluting water resources. In this article, the quality changes of surface water resources due to earthquakes are monitored. In the present research, in order to achieve the above goal, by using various data from Sunnynell 1 satellites, optical data from Landsat 8, and Madis satellite images, the data has been unified in such a way that they can be used together in the form of a dataset for processing. be placed In this research, by using the combination of satellite images (radar and optics), the Starfam algorithm, the spectral signature of Sentinel 1 data and the use of remote sensing indicators (MNDWI, NDVI and RGB color combination), water resources The studied area was identified and then the quality changes of surface water resources affected by the earthquake were obtained in the environment of ARC GIS and SNAP SANTINEL software. The results show that the earthquake caused shaking and displacement of the surface and subsurface layers of the earth and due to the karstic location of the studied area, it caused an increase in the concentration of dissolved anions and cations in water. In the studied area, the role of faults is very obvious. According to the geological structure of Zagros, Sarpol-Zahab city has numerous faults and the most changes of water resources are located in the main path of the faults and follow the fault lines of the region. Also, in terms of geology,
Hydrogeomorphology
najmeh Haj seyed ali khani; hamzeh saeediyan; alijan Abkar
Abstract
Underground dams can be a very suitable alternative to check dams so that in recent decades due to their privileged characteristics, they have attracted the attention of various researchers around the world. Geoelectric samples were carried out at the axle and reservoir of Dehbakri underground dam by ...
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Underground dams can be a very suitable alternative to check dams so that in recent decades due to their privileged characteristics, they have attracted the attention of various researchers around the world. Geoelectric samples were carried out at the axle and reservoir of Dehbakri underground dam by sondage putting method and with using Schlumberge array. These samples were performed during 6 profiles (P1 to P6) and 32 electric sondage. The results of geoelectric studies indicate that there is a two-layer model along the geoelectric sections that the upper layer has alluvial and the underlying layer has bedrock. Alluvial layer is divided into dry parts at the top and wet parts at the bottom. The depth of reaching groundwater level varies in different parts of the study area, but on average it can be considered 5 meters. Alluvial thickness also varies during profiles, but the highest thickness is generally in the middle parts of the geoelectric sections and more close to the right support. The highest alluvial thickness was estimated at the S26 catheter site and 13 meters. Considering the specific electrical resistance scale of the layers and considering the rock outcrops on both sides of the river, it seems that the bedrock in most places has alternating lithology made of shale, marl and sandstone and in some parts of the marl material.
Hydrogeomorphology
Gholam Reza Maghami Moghim; Yasaman Harasany; sharbano Bynaeyan
Abstract
Today, soil erosion is one of the important problems in catchments, lakes behind the dam, various agricultural areas and natural resources, which also causes land degradation, reduced soil fertility and filling the reservoir of dams. Due to climatic conditions, the erosion process in Iran requires more ...
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Today, soil erosion is one of the important problems in catchments, lakes behind the dam, various agricultural areas and natural resources, which also causes land degradation, reduced soil fertility and filling the reservoir of dams. Due to climatic conditions, the erosion process in Iran requires more attention because in this country, soil formation occurs in the long run and its destruction in the short term. The best place to control soil erosion is catchments. It is necessary to pay attention to catchments in the erosion process, especially catchments whose rivers flow into lakes behind dams or play an important role in providing drinking water to a city or region. In this study, using the hydrophysical model (CSY), the sedimentation potential of Damghan River watershed in the southern slopes of Alborz was calculated. The results of this study showed that the Namakeh sub-basin has the highest and the Dibaj sub-basin has the lowest sedimentation potential. The Kalateh Rudbar basin is also in moderate conditions. Therefore, the Namakeh basin is more vulnerable to erosion and should be properly managed by implementing soil protection plans and proper management of the erosion process in this basin.
Hydrogeomorphology
eisa jokar sarhangi; ghasem lorestani; vahid falah
Abstract
The studied area on the Haraz Road from Poldakhter to Vana is prone to avalanches due to its cold mountain climate. The purpose of this research is to determine the most important factors affecting the occurrence of avalanches and its risk zoning using LNRF and Shannon Entropy models. For this purpose, ...
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The studied area on the Haraz Road from Poldakhter to Vana is prone to avalanches due to its cold mountain climate. The purpose of this research is to determine the most important factors affecting the occurrence of avalanches and its risk zoning using LNRF and Shannon Entropy models. For this purpose, the criteria of snow cover, elevation, slope, aspect, slope curvature, landuse and distance from the road have been used. The results of determining the most important factors affecting the occurrence of avalanches in the studied area using Shannon's Entropy model showed that the aspect, landuse, distance from the road and snow cover with weights of 0.541, 0.143, 0.129 and 0.083 respectively are more important. Avalanche risk zoning maps show that the highest avalanche risk is due to the location of these areas at an altitude of 2100-2700 meters and a slope of 30-60 degrees with the direction of the northeastern and northern slopes. Evaluation of avalanche risk zoning maps using the empirical probability index (P) indicates the appropriateness of Shannon entropy and LNRF models in the region, but the application of Shannon entropy has led to an increase in map accuracy up to 97%.
Hydrogeomorphology
maryam bayatikhatibi; Negar Zabet
Abstract
In Iran, due to the fact that a large part of the country is located in arid and semi-arid areas, the problem of salinity has become a big problem in agriculture. In Iran, about 14.7% of the total area of the country is made up of saline lands, and nearly 50% of the agricultural lands are faced with ...
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In Iran, due to the fact that a large part of the country is located in arid and semi-arid areas, the problem of salinity has become a big problem in agriculture. In Iran, about 14.7% of the total area of the country is made up of saline lands, and nearly 50% of the agricultural lands are faced with the problem of salinity or alkalinity and waterlogging to varying degrees (Hussaini, 2015). In the Azerbaijan region due to Lake Urmia, and illegal cultivation and extraction of underground water, soil salinity has become a big problem in a large part of the region and it seems that its dimensions will increase in the future. In this article, the most research focus is on the problem of salinity. The soil is within a radius of a few kilometers from Lake Urmia and near Tabriz. Preliminary observations and studies show that the problem of water salinity and then soil salinity has increased in the study area to such an extent that it has caused farmers to complain and abandon agriculture. and in terms of the dangerous dimensions of the problem, it has drawn the attention of researchers to the problem of soil salinity. The main reason for focusing on this area is excessive soil salinity within a 50-kilometer radius of Urmia Lake.
Hydrogeomorphology
Alireza Ildoromi; nasrin hassanzadeh; fariba hedayetzadeh
Abstract
Sustainable quality of rivers water has become one of the main concerns in developing countries, so monitoring the water quality of these resources for various uses is essential to formulate a public health and environmental management policy. The purpose of this study is to evaluate the water quality ...
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Sustainable quality of rivers water has become one of the main concerns in developing countries, so monitoring the water quality of these resources for various uses is essential to formulate a public health and environmental management policy. The purpose of this study is to evaluate the water quality of Karun and Dez river systems in Khuzestan province and to analyze the suitability of their water quality for drinking and agricultural purposes. To this end, various techniques, indicators and statistical analyzes are used to evaluate spatio-temporal changes in the interpretation of large and complex datasets of 12 water quality parameters collected from the Karun and Dez river basins over a period of 17 years (2003-2019).Evaluation of the trend of water quality changes in the study period also showed that according to WQI, the water quality of Karun and Dez rivers from 2003 to 2007 are in the category of "very poor"and "poor", and from 2008 to 2018 in the "unsuitable" and "very poor"category, respectively. Regarding irrigation parameters, the lack of a clear trend in their values can indicate the lack of effect of river water quality from natural factors and their obedience with human factors. Overall, this study highlights the importance of using water quality indicators that provide a simple interpretation of monitoring data to help improve water quality, because based on these indicators and PCA, it can be concluded that related human activities along the banks of the Karun and Dez rivers, especially in recent years, affect their water quality.
Hydrogeomorphology
Mohammad Mehdi Hosseinzadeh; Ali Reza Salehi Milani; Fateme Rezaian Zarandini
Abstract
Floods, as natural and unexpected events, have occurred frequently in recent decades. To reduce the damages caused by floods and flood management, it is mandatory to assess the possibility of danger and prepare maps of possible danger zones. In recent decades, many destructive floods have occurred in ...
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Floods, as natural and unexpected events, have occurred frequently in recent decades. To reduce the damages caused by floods and flood management, it is mandatory to assess the possibility of danger and prepare maps of possible danger zones. In recent decades, many destructive floods have occurred in the Nakarod catchment. Because of this, to manage floods, reduce damages, and properly use water resources, the flood potential of the sub-basins of the Nakarod catchment has been studied. Neka River is 176 km long, and it is one of the important rivers of Mazandaran province and one of the catchments of the Caspian Sea. In this research, to prepare a map of the sensitivity of the sub-basins to the flood risk of the basin, 11 influencing parameters have been used, which includes elevation, slope, distance from drainage network, drainage density, flow accumulation, rainfall, land-use, geology, stream power index, topographic wetness index and curvature of the topography. The layers were weighted using the Analytical Hierarchy Process (AHP); and eventually, by using the weighted linear combination method in ArcGIS software, the standardized layers were multiplied by the corresponding weight, and then the results of all the variables were added and accumulated together, and the final sensitivity map was divided into five classes. The results of the research indicate that flood sensitivity is different in the sub-basins of the Neka RiverAmong the effective environmental factors in flooding, the elevation and stream density were the most influential factors in the flood risk of the Neka catchment.
Hydrogeomorphology
Abolfazl Faraji mondared; shahram roostaei; Davoud Mokhtari
Abstract
Due to their geomorphological characteristics, alluvial fans are part of the high flood risk area. Placement of human phenomena in flood zones is a factor that intensifies the instability of currents. For this purpose, in this research, we applied the location of human phenomena in the geographical space ...
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Due to their geomorphological characteristics, alluvial fans are part of the high flood risk area. Placement of human phenomena in flood zones is a factor that intensifies the instability of currents. For this purpose, in this research, we applied the location of human phenomena in the geographical space of Pardisan in the flood zone with an applied-experimental method. To achieve this goal, the HEC-RAS-6 hydraulic model has been used as a working tool. Due to the size of the area, the area was divided into 15 sub-basins. First, the sub-layers of rivers and floodplain network were extracted, then human phenomena in the studied space were extracted and located on the RAS background map. Then the measured data and values were considered and implemented in the model. By locating the phenomena and considering the conditions of the alluvial fan flood, it was determined that the 100-year-old flood in the area of railway and communication lines, stairs in the west of Pardisan, west side of Payamnoor University, upstream of Pardisan town and also agricultural lands, has a high vulnerability rate. In general, despite the newly established Pardisan town, urban design and subsequent study and modification of the route did not match the geographical features of the region and the prospect of instability has prevailed in the geographical space of the area. It is suggested that for the future development of the city, the flood route be improved and monitored upstream to maintain environmental sustainability.
Hydrogeomorphology
fatemeh menbari; Amjad Maleki; nayyeri hadi
Abstract
Morphometric analysis of a drainage basins and river network plays an vital role in understanding the hydrogeological behavior of the drainage basin . Therefore, the current research was conducted with the aim of modeling flood and its relationship with morphometric variables using multivariate regression. ...
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Morphometric analysis of a drainage basins and river network plays an vital role in understanding the hydrogeological behavior of the drainage basin . Therefore, the current research was conducted with the aim of modeling flood and its relationship with morphometric variables using multivariate regression. The research method is based on the destruction of morphometric parameters and statistical analysis, including correlation coefficient and linear regression analysis. In this regard, first, the studied basins have been selected using ARC GIS 10.5 software, and the limits of each one has been determined. Then, their morphometric characteristics have been extracted. The Flood discharge has also been reconstructed in return periods of 2 to 500 years using easy-fit software. For modeling, first, the linear relationship between each morphometric variable as an independent variable with flood discharge as a dependent variable was investigated. After ensuring the linear relationship between variables and flood discharge, correlation between each variable and flood discharge was calculated. The variables with the highest correlation were watershed area, basin length, and surface flow length. Using multivariate regression, modeling was used for independent variables and flood discharge. The results show that as the return period increases, the relationship between independent variables and flood discharge increases, So that the correlation of the area with the return period of 25 years is 0.609 and with the return period of 200 years is 0.677.also, the proposed models have more validity for flood prediction using multivariate regression analysis in return periods above 25 to 500 years.
Hydrogeomorphology
Amir Saffari; Sara Mohammadi; Ali Ahmadabadi; Sahar Darabi
Abstract
Floods are one of the most important natural hazards that often affect millions of people around the world annually with huge impacts. In recent years, due to the occurrence of frequent floods in the watershed of Cheshmekile River and the subsequent damage caused by floods, the need to pay attention ...
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Floods are one of the most important natural hazards that often affect millions of people around the world annually with huge impacts. In recent years, due to the occurrence of frequent floods in the watershed of Cheshmekile River and the subsequent damage caused by floods, the need to pay attention to the zoning of the flood risk in the investigated basin is becoming more apparent. Among the different methods for preparing flood zoning maps, statistical methods are more important due to their simplicity and acceptable accuracy. The aim of this research is to compare the reliability of Shannon entropy models, frequency ratio and witness weight in the context of flood zoning in Cheshmekile watershed. In this research, the criteria of slope, elevation classes, soil type, topographic humidity index, distance from the river, geology, land use, watercourse density, NDVI and rainfall have been used. The probability of flood occurrence has been calculated for each class of each parameter. The calculated weights for each class were applied in the ARC GIS software in the relevant layers and flood zoning maps of the area were obtained. The final maps resulting from the implementation of these three models in the region were divided into 3 low risks, medium and high-risk classes. And finally, the reliability of each model was evaluated using the system performance characteristic curve (ROC). The results have shown that frequency ratio (FR), weight of evidence (WOE) and Shannon entropy (SE) techniques have the highest accuracy in predicting the occurrence of floods.
Hydrogeomorphology
Davoud Mokhtari; Amir Heshmati
Abstract
Knowing the subsurface structures is one of the ways to access underground resources, and knowing the characteristics of alluvial sediments is very important for exploitation, management and control of underground water. Shahryar plain located in the west of Tehran city and south of central Alborz, which ...
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Knowing the subsurface structures is one of the ways to access underground resources, and knowing the characteristics of alluvial sediments is very important for exploitation, management and control of underground water. Shahryar plain located in the west of Tehran city and south of central Alborz, which supplies an important part of Tehran city's drinking water, is covered with Quaternary alluvium. The purpose of this article is to determine the thickness of these alluviums. There are different geophysical methods to estimate the thickness of different layers of the earth to determine the characteristics of alluvial deposits, including the type, depth, thickness, etc., of this plain, the data of electric soundings includes: 12 profiles and 186 sections, received from the regional water organization, geological maps, and data DEM used. After checking and validating the data, by choosing the normal kriging interpolation method with exponential variogram, the alluvial thickness and topography maps of the underlying layers include: alluvial thickness map, evaporite sediment surface topography, tuff and igneous rocks topography, The topography of the bedrock of the region, the thickness of evaporite sediments and the topography of the conglomerate surface of the region were preparedin in GIS with the highest accuracy. Then horizontal and vertical characteristics of these deposits were investigated. The results showed the maximum thickness of the alluvium is up to 350 meters in the center And near the edge of the plain, the thickness of alluvium decreases so that it is about 10 meters in the west and southwest.
Hydrogeomorphology
Jafar Jafarzadeh; Meysam Argany
Abstract
Groundwater is one of the most important natural resources in arid and semi-arid regions. The purpose of this study is to identify areas that have groundwater capacity and to prioritize the factors affecting it. In this study, 11 indicators affecting groundwater capacity including Slope, Elevation, Aspect, ...
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Groundwater is one of the most important natural resources in arid and semi-arid regions. The purpose of this study is to identify areas that have groundwater capacity and to prioritize the factors affecting it. In this study, 11 indicators affecting groundwater capacity including Slope, Elevation, Aspect, Distance from River, Drainage Density, Distance from Fault, Topographic Wetness Index, and Topographic Position Index, lithology, Land use and Relative Slope Position were used. 30% of the totals of 230 wells were randomly placed in the validation data group and 70% in the training data. To prioritize the effective factors and zoning of groundwater potential in Ghorichay watershed, the random forest method was used using ArcGIS and to evaluate the model of relative performance curve (ROC) and Area Under the curve surface (AUC). The results showed that the groundwater capacity of about 8% of the watershed is higher at the outlet of the watershed. According to the VIP diagram, the TWI layer with a value of 0.329 and the distance from the river layer with a value of 0.175 was the most and the least influential factors on groundwater capacity, respectively. The area below the AUC curve showed an accuracy of 87% in the training phase to identify areas with groundwater potential. The result of this study can be used in groundwater management in the Ghorichay watershed.
Hydrogeomorphology
Vahideh Moradzadeh; Zeinab Hazbavi; Abazar Esmali Ouri; Raoof Mostafazadeh; Shirin Zarei; Nazila Alaei
Abstract
Ecological indicators have become important tools for evaluating and monitoring natural resources. Understanding the relationship between biological activities and ecological interactions is essential to their structure. On the other hand, human activities have significant effects on landscape evolution ...
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Ecological indicators have become important tools for evaluating and monitoring natural resources. Understanding the relationship between biological activities and ecological interactions is essential to their structure. On the other hand, human activities have significant effects on landscape evolution through changes in sediment production, transport, and storage. Therefore, this issue should be considered in the comprehensive management of different watersheds and ecosystems. Accordingly, the present study was conducted to evaluate the spatial heterogeneity of the hydro-sedimentologic disturbance index (HSDI) in the watershed located in the central part of Ardabil province. For this purpose, sediment transport (ST), hydrological stress (HS), recharge potential of groundwater (Rec), and soil erosion potential (SEP) were first calculated for 27 different sub-watersheds. Then, these factors were weighted using the Shannon entropy method. The hydro-sedimentologic disturbance index (HSDI) was calculated and zoned using the weighted average. The results showed that the mean, maximum and minimum values of the HSDI index in the Samian watershed were 10.17, 45.67, and 0.20, respectively. In addition, 87.67, 5.33, 5.32, and 1.68% of the watershed area were classified into very low, low, medium, and high levels of disturbances, respectively. Sub-watershed 19 located in the northern part, and sub-watersheds 20 and 21 located in the central part of the Samian watershed have the most disturbances, so they are prioritized for management actions. The present research framework can be used as a potential tool to support decisions that should focus on improving natural resource management.
