عنوان مقاله [English]
Instantaneous Unit Hydrograph (IUH) is the response of a watershed subjected to a storm with an excess rainfall of 1 unit depth occurring on the watershed instantaneously, used as the response function in rainfall- runoff modeling. Omission of excess rainfall duration from unit hydrograph theory has made it better and easier to investigate on rainfall- runoff relationship. This study focuses on derivation of IUH from direct runoff hydrograph using Diskin method in Jafar Abad watershed (109 km2) located in Golestan province. Using hourly hydro-meteoerological data the index unit hydrograph was derived from 27 storms by S curve method and then index IUH was calculated from S curve. Then the Diskin method was used for derivation of IUH from 4 different direct runoff hydrographs. The efficiency of Diskin method was evaluated by statistical comparison with the observed IUH. The results indicated that the method derived IUHs with good accuracy, 85% according to the Nash-Sutcliffe criterion. Also mean relative error of instantaneous peak discharge and relative error of instantaneous time to peak, are 2.24% and 6.25% respectively while the model bias for water balance is -0.92%. Nonetheless more researches in other watersheds are suggested for derivation of instantaneous and flashy floods for planning into reduction of flood damages.
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