بررسي خصوصيات سيل هاي رودخانه گرگانرود در ايستگاه هيدرومتري گنبد

According to the UN reports, among natural disasters, floods and storms have caused the most damages to human society. In Iran, due to the destruction of environmental and natural resources, there has been an increase in flood disasters. In this research, in order to study flood characteristics of Gorgan Rud river in Gonbad hydrometric station. 40 years (1337-1377) daily discharge data was analyzed. At first, homogeneity of data was tested by Smirnov-kolmogrov technique using technical hydrology soft ware. The daily discharge of hydrograph was drawn for the entire period and then all the floods during the period were studied. Then, the floods characteristics including time of occurrence (month, season and year), initial discharge, peak discharge, volume, time to peak and… were extracted from hydrograph. The study showed that there was an increase in the frequency of floods’ occurrence during 1338-1377. Flood occurred in spring and summer has the longest and the shortest base time, respectively.