Volume 15, Number 58 (winter 2012)                   JWSS 2012, 15(58): 231-240 | Back to browse issues page

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A. Shirzadi, K. Chapi, P. Fathi. The Estimating of Synthetic Unit Hydrograph Using Regional Flood Analysis and Geomorphologic Parameters (Case Study: Kanisavaran and Marenj Watersheds, Kurdistan). JWSS. 2012; 15 (58) :231-240
URL: http://jstnar.iut.ac.ir/article-1-2047-en.html

Abstract:   (13984 Views)
Estimation of flood hydrograph is of necessities in hydrological studies such as flood mitigation projects. This estimation in un-gauged watersheds is usually taken place using geomorphological characteristics of watersheds. The objective of this research is to estimate synthetic unit hydrograph using regional flood frequency analysis and geomorphological parameters of watersheds. 1-hour and 2-hour hydrographs of two watersheds, Kanisavaran and Maranj Watersheds, were generated using maximum discharge data based on regional flood frequency analysis. Estimated hydrographs were compared with observed data and the efficiency of the model was evaluated using Nash-Sutcliffe coefficient, absolute and bias errors. The results showed that multiple regression models give more acceptable results among others for the computation of synthetic unit hydrograph (higher coefficient of determination). The Nash-Sutcliffe coefficient was 0.98 for 1-hour hydrograph while it was 0.93 for the 2-hour hydrograph. The absolute error in 1-hour hydrograph and 2-hour hydrograph was 0.13 and 1.2, respectively. The bias error was close to zero for both hydrographs, indicating that the proposed model is efficient. The model may be used for estimation of synthetic unit hydrograph in similar un-gauged watersheds.
Full-Text [PDF 473 kb]   (4081 Downloads)    
Type of Study: Research | Subject: Ggeneral
Received: 2012/03/17

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