双重套网格数值模式对一次暴雨系统模拟的比较试验

COMPARATICE EXPERIMENT OF A HEAVY RAIN SYSTEM SIMULATION USING THE DUAL NESTED GRID NUMERICAL MODEL

本文以自嵌套方式，将一个有限区域暴雨数值模式编制成单向和双向的套网格模式，同时又将这两个套网格模式分别与T42L9模式进行了单向嵌套。形成了单向、双向两个双重套网格模式。运用这两个模式对1991年7月江淮流域的一次特大暴雨过程进行了数值试验。结果表明：套网格模式的模拟结果要比未套网格模式的好。而双向套网格模式在雨带、系统等方面的模拟比单向套网格模式为好．文中对部分试验结果进行了比较分析。

In this study, a limited-area numerical model for heavy rain is coinplied into a oneway and a two-way nested grid models by the auto-nesting approach. And the two models are then one -way-nested respectively with T42L9 model, thus forming a one - way and a two-way dual nested grid models, with which numerical simulation xperiments are done on an extrordinarily heavy rain occuring over the Changjiang - Huaihe River reaches in July 1991. Modelling indicates that the results from the nested grid model are better than those from the unnested grid model and those from the two-way nested grid model are better than those from the one-way nested grid model. And comparative analysis is made of part of the experiment results in much detail.