Asadollah Hejazi; Sogra Andariani; Farhad Almaspour; Abolfazl Mokhtari Asl
Volume 2, Issue 3 , January 2017, , Pages 61-80
Abstract
Flood is the main destructive phenomena in Iran which causes human casualties and financial damages every year. The purpose of this research is to define flood susceptible zones in Ligcanchai Catchment. To achieve this end this study provided different information layers such as slope, elevation, ...
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Flood is the main destructive phenomena in Iran which causes human casualties and financial damages every year. The purpose of this research is to define flood susceptible zones in Ligcanchai Catchment. To achieve this end this study provided different information layers such as slope, elevation, soil hydrological units, curve number, runoff height, lithology, land use and landcover, hydrography density, compactness coefficient of 23 basins by using maps, reports, satellite images and field studies. All layers were then weighted with criteria and sub criteria. The study used the hierarchical method to weight criteria and fuzzy logic to weight sub criteria. Then 5 flood susceptible zones were defined by using multi-criteria evaluation and linear combination was weighted. The results show that around 28 percent of the Catchment has high and very high flood risk and that these areas are located near Tabriz city. Since flood events destroy the infrastructures and cause human casualties every year, substantial actions must be taken to prevent the high and very high flood risks. These activities must be planned in the integrated watershed management plans, and the flood risk management in order to improve the watershed vegetation in the watershed to minimize financial damages and human life losses.
Asdolla Hejazi; Mahdi Mezbani
Volume 2, Issue 5 , January 2017, , Pages 63-81
Abstract
A. Hejaci M. Mezfani Abstract A valid estimation of runoff volume and maximum discharge in the dried and semiarid regions which lack data is important for flood management. One of the estimating methods of runoff volume is related to curve number (CN) of American soil conservatives ...
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A. Hejaci M. Mezfani Abstract A valid estimation of runoff volume and maximum discharge in the dried and semiarid regions which lack data is important for flood management. One of the estimating methods of runoff volume is related to curve number (CN) of American soil conservatives services (SCS). In this study, the drainage basin of Darrehshah Sarab has been studied with regard to its runoff volume potentiality, maximum discharge and effective factors. To estimate the runoff volume and maximum discharge of the sub-catchments, the curve number method has been used. First, the layers and the needed data including the land use, soil hydrological groups and a maximum 24 hours precipitation was prepared for basin. Then the CN values, infiltration (S), runoff volume (Q) and maximum discharge (Q max) were calculated for the entire basin and each sub-basin. Finally, factor analyses based on 19 parameters were used to identify the effective factors on maximum discharge at sub-basins. The results showed that among the used parameters in sub basins, two physiographic parameters (area and drainage density) were effective parameters in flooding potential of the drainage basin of Darrehshah Sarab.
