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Effect of Base Flow and Rainfall Excess Separation on Runoff Hydrograph Estimation using Gamma Model (Case Study: Jong Catchment)

  • Erfan Bahrami
  • Omolbani MohammadrezapourEmail author
  • Meysam Salarijazi
  • Parviz Haghighat jou
Water Resources and Hydrologic Engineering
  • 5 Downloads

Abstract

A forecast of runoff hydrograph leads to effective decision making in flood management. In this study, effect of three base flow separation methods- straight line (DRH1), fixed base (DRH2), and variable slope (DRH3) and two methods of excess rainfall estimation (Ø index and SCS (Soil Conservation Service) method) with six different rainfall-runoff events are studied on the flood hydrograph simulation. The 6 rainfall-runoff events recorded at Jong catchment in Iran were used for this study. The Percentage Error in Volume (PEV), Percentage Error in Peak (PEP), Percentage Error in Time to Peak (PETP), Nash-Sutcliffe Coefficient (NSC), R2 and Root Mean Square Error (RMSE), were also used to evaluate the results. The results show that the combination of SCS-DRH2 method is the best combination of base flow separation - excess rainfall for improving the accuracy of the model in predicting the hydrograph shape. Also, in estimating the flood volume, the SCS-DRH3 and SCS-DRH1 are the best combination in estimating peak flood and time to peak the flood respectively. The analysis of the results suggests that the combination of SCS-DRH2 is the best combination in improving the accuracy of Gamma model.

Keywords

base flow separation excess rainfall gama model runoff flood peak flow 

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Copyright information

© Korean Society of Civil Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Erfan Bahrami
    • 1
  • Omolbani Mohammadrezapour
    • 1
    Email author
  • Meysam Salarijazi
    • 2
  • Parviz Haghighat jou
    • 1
  1. 1.Dept. of Water EngineeringUniversity of ZabolZabolIran
  2. 2.Dept. of Water EngineeringGorgan University of Agricultural Sciences and Natural ResourcesGorganIran

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