Efficiency Evaluation of Diskin Method in Derivation of Instantaneous Unit Hydrograph in Jafar-Abad watershed, Golestan Province

Mostafazadeh, Raoof; Bahremand, Abdolreza; Zabihi, Mohsen

doi:10.22059/ije.2015.56144

Efficiency Evaluation of Diskin Method in Derivation of Instantaneous Unit Hydrograph in Jafar-Abad watershed, Golestan Province

Document Type : Research Article

Authors

¹ Assistant Professor, Dept. of Rangeland and Watershed Managemnet

² Associate Professor, Dept. of Watershed Management, Gorgan University of Agriculture Sciences and Natural Resources, Gorgan, Iran

³ PhD Student in Watershed Management Sciences and Engineering, of Science Graduated, Dept. of Watershed &lrm;Management Engineering, Faculty of Natural Resources, Tarbiat Modares University

10.22059/ije.2015.56144

Abstract

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.‎

Keywords

Main Subjects

Ecohydrology

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