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Information Journal Paper

Title

CALIBRATION OF ANNUAL WATER YIELD MODEL OF CATCHMENTS

Pages

 Start Page 16 | End Page 23

Abstract

 Watershed management and water resources planning need to know hydrological relationships especially the data time series of annual runoff depth at the outlet of catchments. The numbers of 7 catchments were obtained to investigate the ability of selected MATHEMATICAL MODEL for simulation annual runoff depth yearly. Area of all selected catchments are less than 170km2, acceptable hydrometric data time series long equal 6 to 27 years and so all of them located in and around of ZANJAN PROVINCE. At every selected catchments depth of precipitation, runoff and potential evapotranspiration (Blanney- Criddle method) estimated for every year. Based on gathered data and information, determined the calibration coefficient (only calibration variable parameter) of a MATHEMATICAL MODEL named (GR1A). The optimization criterion of calibration coefficient is the maximization of Nash-Sutcliffe coefficient as agency of model performance. Result is that the percent of Nash-Sutcliffe coefficient is 63.5 to 35.4 and acceptable at 4 catchments but is invalid at others. The invalid of Nash- Sutcliffe coefficient is affected by imprecise measured data, especially hydrometric data. So calibration coefficient of mentioned model is 0.11 to 0.24 at accepted catchments.

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