Comparison of Derived Instantaneous Unit Hydrograph fromH2U, Laplaceand H2U-Nash, Case Study:North Karoon River Basin, Iran
Journal Title: International Research Journal of Applied and Basic Sciences - Year 2013, Vol 5, Issue 3
Abstract
Flooding is a kind of natural disaster affects life, livelihoods and human assert sat an unexpected scale. Recently there is heightened research interest in simulation of flood hydro graph as watershed response to rainfall. Hence, studying floods is counted as significant portion of hydrology and reservoir management projects;one of the most popular methods in volume trice valuation of output water from ungauged catchments is applying synthetic unit hydro graph, particularly the instantaneous type. Due to the lack of good knowledge about the performance of Laplace transformation, H2U, and H2U-Nash models in the study area the present work is an attempt to explore derived values on three catch ments located in western part of Iran, which are named Bazoft, Juneghan, and Khanmirza. For each catchment 10 individual rainfall-runoff events were collected as observation to compare to transformed Laplace hydro graph (simulated based on effective rainfall and lag time), H2U(characterized by ranking parameters of catchments and average travel time) and H2U-Nash (by applying momentum of effective rainfall and direct runoff). Statistical comparison between simulated hydro graphs and observations ranked H2U-Nash, Laplace transformation, and H2U model with RMSE 0.3, 0.37, and 0.51 in their agreement with measurements respectively. The Nash–Sutcliffe model efficiency coefficient approved this ranking as well. Moreover, Bazoft, Khanmirza, and Juneghan catchments, with mean absolute of relative errors 0.31, 0.41, and 0.46 respectively, stand in the aforesaid hierarchy based on the precision of hydro graph properties estimation in all three models. This study also covers a comparison among different properties of simulated hydro graph, on the whole models showed comprising results for the base time of hydro graphs.
Authors and Affiliations
Zohre Abdollahian Dehkordi| MSc Graduated Student of watershed Management Engineering, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran, Sayedjavad Sadatinejad| Associated professor of Watershed Management Engineering, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran, Afshin Honarbakhsh *| Assistant professor of Watershed Management Engineering, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran, email: afshin.honarbakhsh@yahoo.com, Khodayar Abdollahi| Ph.D Student, Vrije Universiteit of Brussel, Brussel, Belgium, MohammadNekooeimehr| Instructor atResearch Center of Agricultural and Natural Resources of Chaharmahal and Bakhtyari, Shahrekord, Iran
Keywords
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