عنوان مقاله [English]
Flood is one of complex and destroyed phenomenon. Generally flood risk determines flood situations in each basin. Iran country have a arid climate that rainfall with high density is the main climatic features and caused many floods with destruction human, buildings and engineers structures. The object of this study is the analysis of flood situations in sub-basins of westerns Azerbaijan province. To do this statistics of flood hazards and destruction analyzed.
Westerns Azerbaijan province located in the north west of Iran and have a temperate climate with rainy season in winter and autumn. Data used in this study are lithology, slope gradient, thickness of materials, humidity coefficient and rainfall rate, temperature, land use. Other data were used is
Satellite data including ETM images of 2005 studied and using color composite images of 7, 4 and 1 bands recognized. Then in order to flood susceptibility areas take places with high accuracy, Straher method for river classification were used. Using this classification for each of these classes, one area titled hazard flood area calculated in GIS environment and finally Qal geology formation added this area from geology map scaled 1:100000. In next step in order to calculation of flood intensity used historical flood records.
Results and Discussion
The result indicated that Zangbar sub-basins have high flood hazards and need required works to mitigate floods impacts. The prepared map show Simineh Rud and Zarineh Rud subbasins have high intensity and Simineh rod have high flood areas. In generally the analysis shows 3033 residential centre and 36 urban areas located in studied province that 603 residential and 10 urban areas were located in flooded zones. The western subbasins with 125 residential centers have highest number of located in flooded areas.
Consider to location of western n Azerbaijan and due to high latitude and high elevation have high rate of snow. In addition spring season rainfall increase and caused flood occurrence. In totally all subbasins have flood susceptibility areas with low and high intensity. Then in order to combat with flood hazards in these areas is vital and different methods can be used.