太湖流域设计暴雨的时空分布计算

利用太湖流域1951-2010年的雨量资料,从平均暴雨日数和最大30 d雨量两个方面,分析流域暴雨时空分布特性。太湖流域多年平均暴雨日数、多年平均最大30 d雨量在时间分布上都呈增加趋势但不显著,在空间分布上山丘区均大于平原区。通过对流域和分区时段雨量的重现期进行统计分析,提出两种可能的流域设计暴雨空间组合方案及反映太湖流域暴雨特点的设计暴雨时空分布计算方法,结果表明本文提出的针对太湖暴雨特点设计的暴雨空间组合方案及计算方法合理。

Calculation of temporal and spatial distribution of design storm in Taihu basin

The paper analyzed the spatiotemporal characteristics of storm of the Taihu Basin by use of the rainfall data from 1951 to 2010 of Taihu basin from two aspects of average rainfall days and the maximum precipitation of 30 days.The results indicated that the temporal distribution of average rainfall days and the maximum precipitation of 30 days possesses the upward trend but is not obvious,and the spatial distribution of storm in hilly areas is more than that of plain areas.The paper propsed two spatial combination schemes of design storm by statistical analysis for the return period of period rainfall of the basin and partitions could reflect the feature of design storm of calculation method of temporal and spatial distribution.The results indicated that the spatial combination scheme of design storm and related calculation method adopted in this paper aimed at the feature of storm in Taihu basin are reasonable.