基于全国50km×50km网格的大尺度陆面水文模型框架

Macro-scale land hydrological model hased on 50km×50km grids system

基于陆面物理过程模型VIC及中国内陆50km×50km分辨率网格,建立了大尺度陆面水文模型框架,生成了网格植被参数库和土壤参数库,完成了740个气象站点降水及温度数据在全国50km×50km格网上的插值。该模型考虑了陆气间的水分和能量平衡,径流机制同时考虑蓄满产流、超渗产流及土壤性质的空间非均匀性。利用所建立的模型框架对处于半干旱区的渭河部分子流域进行分析,结果表明所建模型框架具有一定的合理性和适应性。

Based on the variable infiltration capacity(VIC)land surface model a macro-scale land hydrological model with 50km×50 km grid system of China is established.The database for vegetation parameter and soil parameter are derived from AVHRR(Advanced Very High Resolution Radiometer)information and the precipitation and temperature for 740 meteorological stations in the grids are obtained from interpolation.In the new hydrological model not only the balances of water content and energy between land and atmosphere are taken into account but also the mechanism of Horton runoff and the effect of soil heterogeneity on runoff are to be considered.The model is applied to analyze the hydrological data of the Weihe River.The result shows that the calculated runoff discharge by using this model is in good agreement with observation data.