Application of VIC Model in Western Tianshan Mountains
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Abstract:
To guide the studies on snowmelt runoff simulation and flood forecast in alpine regions, in this paper, we took the Kashi River basin in Western Tianshan Mountains as the study area, and built a VIC model to conduct runoff simulation study based on the hydro-meteorological data, CFSR reanalysis data, DEM, soil and vegetation data of the study area during 1990 to 2000. It was found that 1) CFSR reanalysis data can be used as a data source in areas lacking meteorological data, but they should be calibrated as they deviate from the real situation. 2) It is feasible to remove CFSR abnormal data by using the precipitation data of an appropriate hydrological station as the basis on which CFSR reanalysis data are calibrated, taking the CFSR reanalysis data grid of the hydrological station as the standard, and establishing its correlations with other CFSR grids. 3) The established VIC model had certain applicability in the study area, and the parameters in this model were reasonable. 4) In the calibration period, the relative errors of model efficiency coefficient and multi-year runoff were 0.80 and 4.7% respectively on the monthly scale, and 0.64 and 3.3% respectively on the daily scale. In the verification period, the relative errors of model efficiency coefficient and multi-year runoff were 0.84 and 14.5% respectively on the monthly scale, and 0.70 and 13.1% respectively on the daily scale.
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