Hydrology
Mahnaz Rezaei; Somaiyeh Khaleghi; Mohammad Mahdi Hosseinzadeh
Abstract
Considering the importance of the subject, in this research, the factors affecting the hydrological changes of the Taleghan River have been investigated. Descriptive-analytical methods have been used in this research. The most important data of the research included Landsat 5 and 8 satellite images, ...
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Considering the importance of the subject, in this research, the factors affecting the hydrological changes of the Taleghan River have been investigated. Descriptive-analytical methods have been used in this research. The most important data of the research included Landsat 5 and 8 satellite images, the SRTM 30-meter height digital model, Taleghan synoptic station climate information, and regional discharge information. Also, the most important tools used in the research were ArcGIS, ENVI, and SPSS. According to the subject of the study, this research has been done in several stages. In the first stage, the evaluation of land use changes, in the second stage, the evaluation of changes in climatic elements, and in the third stage, using IHA indicators, has been paid to evaluate the hydrological changes of the Taleghan River. The results of this research have shown that during the years 2000-2017, the average temperature of the region has increased and the area covered by snow has decreased. Also, under the influence of population growth, the use of artificial areas has increased and the use of gardens and pastures has decreased. Also, the total results of this research have shown that the discharge of the Taleghan River under the influence of natural and human changes, in terms of all IHA indicators, has had a significant decreasing trend. Also, among the stations in the region, the Glink station, which is located downstream of other stations, has faced more changes, which can be considered as the result of human activities and climate changes.
Behroz Nasiri; Mohammd Hosain Naserzadeh; Meysam Toulabi Nejad; Zahra Zaree Chaghabalaki
Volume 2, Issue 5 , January 2017, , Pages 141-166
Abstract
Behroz Nasiri[1] Mohammad Hosaien Naserzadeh[2] Meysam Toulabi Nejad[3]* Zahra Zareei Chaghabalaki[4] Abstract The current study investigates the effect of ENSO atmospheric-oceanic pattern as an effective factor in hydrological conditions of Kashkan River. To do so, the related data of Southern ...
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Behroz Nasiri[1] Mohammad Hosaien Naserzadeh[2] Meysam Toulabi Nejad[3]* Zahra Zareei Chaghabalaki[4] Abstract The current study investigates the effect of ENSO atmospheric-oceanic pattern as an effective factor in hydrological conditions of Kashkan River. To do so, the related data of Southern Oscillation patterns using East Angelina university website was gathered, and the statistics period of 1984-2010 was considered. The related data of Kashkan’s annual discharge was also collected using related references. Pearson coefficient analysis was used in order to analyze the monthly and annually data, with at least (p_value=0.01) 0.99% significant level. For assessing the effect of cold and warm phases of this macro-scale weather pattern, discharge’s annual data based on the mentioned monthly phases was considered and Independent two-tail t-test was run. Applying this test, the meaningfulness of differences among discharge’s annual data in cold and warm phases was investigated. Finally, the cause and atmospheric relationship between data was analyzed using Synoptic map analysis. The results show that Kashkan River’s discharge has a meaningful significant coefficient with ENSO index in October, November and December. Also the result of synoptic map analysis shows that in years with warm phase of ENSO (El-nino), autumn raining around Kashkan River increased about 26 percent over the long term. But in the cold phase autumn raining in that area had been about 10.5 percent less than the normal amount. Running the Independent two tail t-test on the annual discharge shows that in the years with warm phase of ENSO, the average amount of Kashkan River’s annual discharge has been 35 percent more than the years with cold phase of ENSO. [1]- Assistant Professor in Climatology, the University of Lorestan [2]- Assistant Professor in Climatology, the University of Lorestan.. [3]- Ph.D Student in Urban Climatology , University of Kharazmi (Corresponding author), Email:meysam.toulabi@gmail.com . [4]- Ph.D Student in Climatology ,the University of Loresta.
