柘林水库修河流域降水时空分布特征与旱涝研究

根据1953—1983年降水资料,分析了柘林水库修河流域降水时空分布特征和旱涝规律。降水主要集中在6月中、下旬,有时可推迟到7月中旬,此时暴雨频数高,强度大,历时长,是柘林水库洪水运行管理的关键时期。为此,需要了解梅雨晚期发生的大暴雨的形成条件和时空分布,以及梅雨期旱涝情况和采用预报的风险程度。本文在这方面进行了一些综合性分析,特别是对5,6月旱涝年份的统计规律、环流特征作了较详细的气候学对比研究。

Distribution of precipitation and regularity of droughts and floods over drainage basin of Xiuhe River in upper reaches of Zhelin Reservoir

Based on the precipitation data from 1953 to 1983, the features of the spatial-temporal distribution of precipitation and regularity of droughts and floods oyer the Xiuhe River basin in the upper reaches of Zhelin Reservior are analysed. In general, rainfall mainly occurs in the middle and last decade of Jane, Sometimes the rainy season is delayed to the middle decade of July, Statistics show that two month's rainfall from May to June yields about 55% of the year's total. The heavy rainstorms in the end of Maiyu are of great importance for the responsible department to control flood operation. A composite distribution map of 14 heavy rainstorms is given, meanwhile, the features of circulation during drought and flood years are also comparatively investigated in this paper.