SNOWMELT RUNOFF SIMULATION BASED ON COUPLED ATMOSPHERIC-HYDROLOGICAL MODELING IN ALPINE REGIONS

In order to improve the simulation accuracy of snowmelt runoff in the alpine areas and better guide the sustainable development and utilization of water resources in the glacial snowmelt areas, and the Ili river basin as a typical research area. the meteorological simulation results of the Weather Research and Forecasting (WRF) model with high resolution simulation accuracy were used to drive the distributed Variable Infiltration Capacity (VIC) hydrological model, and the data assimilation technology was used to improve the accuracy of meteorological simulation in the WRF model. The WRF-VIC atmospheric-hydrological coupling model based on the data assimilation correction is constructed to carry out snowmelt runoff simulation research in alpine mountains. The results show that the WRF-VIC atmospheric-hydrological coupling model has better simulation results in non-flood season runoff, and the total simulation error value of the whole flood season was -81.85mm; and the data assimilation improves the runoff simulation effect of the WRF-VIC atmospheric-hydrological coupling model in the flood season, and the error is reduced from -81.85 mm to -68.86 mm.

Automated summary

This study used the high-resolution Weather Research and Forecasting (WRF) model and data assimilation technology to construct the WRF-VIC atmospheric-hydrological coupling model for simulating snowmelt runoff in alpine areas, and achieved satisfactory simulation results.