Developing an Empirical Relations between Nash Model Parameters and Watersheds Topographical Characteristics for Predicting Direct Runoff Hydrograph
نویسندگان
چکیده
The limited availability of the recorded rainfall-runoff data for many watersheds restricts development and management different activities water resources. To overcome this limitation, Natural Resources Conservation Service (NRCS) estimating storm excess rainfall momentum optimization methods were combined in a mathematical model to estimate optimal parameters Nash Instantaneous unit hydrograph (IUH) resulting direct runoff (DRH), using developed computer program MATLAB. available 14 storms (out 18) four northern Iraq have been applied calibration stage. An empirical relationship was between average each IUH parameter (obtained by as an method according tests) effective watershed topographical characteristics. relations used verification stage DRH compare with that resulted from Haan’s method. statistical tests showed efficiency better than close method, where value Nash-Sutcliffe Efficiency applying 0.925, 0.587, 0.883 respectively. results indicated model’s ability ungauged Iraq.
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ژورنال
عنوان ژورنال: Tikrit Journal of Engineering Science
سال: 2023
ISSN: ['2312-7589', '1813-162X']
DOI: https://doi.org/10.25130/tjes.30.2.9