Simulation of yearly and monthly water flow regime for small catchments of Zanjan province
2011
Rezaei, Ali
For watershed management and water resources planning especially at small watersheds need to know hydrological relationships among the time series of yearly and monthly runoff depth. For investigation the ability of selected mathematical models as simulation of yearly and monthly runoff depth, with scrutiny of the all hydrometery stations in and around of Zanjan province only the numbers of 7 catchments were selected from the point of view of area, accuracy and long of data series. The area of all selected catchments is less than 170km2 and acceptable hydrometric data time series period are equal 6 to 27 years. At every selected catchments depth of yearly and monthly runoff, depth of precipitation and potential evapotranspiration estimated for months of every water year. After for simulation of yearly runoff depth with calibration coefficient of (X) the mathematical model of (GR1A) and for monthly runoff depth the mathematical model of (GR2M) with calibration coefficients of _³1& X 2 were selected. The amounts of calibration coefficients of them were so determined that the Nash-Sutcliffe coefficient to be maximized as a performance index of models. Results are that for yearly water yield model the percent of Nash-Sutcliffe coefficients are 63.5 to 35.4 and acceptable only at 4 catchments with geological rock units and less soil depth with calibration coefficients of (X) that are between 0.11 to 0.24. But for monthly discharge model at every 7 investigated catchments the Nash-Sutcliffe coefficient percents are acceptable and average calibration coefficients are X1=95.23 and X2= 1.33. Key words: GR1A, GR2M, Mathematical model, Monthly discharge, Water
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