暴雨预报套网格数值模式试验的初步结果

INITIAL EXPERIMENT RESULTS OF THE NESTED GRID NUMERICAL MODEL FOR TORRENTIAL RAIN FORECASTING

本文设计了双向的粗细网格相互嵌套的套网格模式,采用同模式自身相互嵌套,既加密了网格,改善了预报质量,又不致过多地增加计算量。结果表明:24小时模拟过程中计算稳定,在网格嵌套处未见到边界值有不协调的现象,暴雨预报结果亦较原模式有所改进。

A two-way grid model internested by coarse-fine mesh is designed. As the model is self-internested, it densifies the grid, much Improving the quality of forecasting without having to do many calculations. Results show that operation is stable in the 24-hr simulation process and there is no incoordination between the boundary values at the nested grid. The new model proves to be an improvement on the original one in heavy rain forecasting.