通过自动雨量站数据分析清江流域强降水分布特征

Analysis of the Distribution Characteristics of Heavy Rainfalls in Qingjiang River Basin based on Data from Automatic Rainfall Stations

利用2007—2011年清江流域62个区域自动雨量站资料,对该流域出现的94次强降水过程的时间、地域分布特征进行分析。结果表明,(1)该流域的强降水为流域中游大、上游、下游两头小的特征,雨量最小值在下游桃山,最大值在中游恩施境内马者至屯堡一带;(2)清江流域强降雨时段多在夜间,降水的日变化主要特征为,一天中降水主要集中在0时至08时,降水最强出现在04时至05时,08时以后降水逐时递减。

Based on the rainfall data from 62 automatic rainfall stations in Qingjiang River basin from 2007 to 2011,the temporal and spatial distribution characteristics of 94 heavy rainfalls occurred in the basin are analyzed. The results show that the rainfalls are bigger in the middle reaches and smaller in both the upper and lower reaches,with the minimum value occurred in Taoshan in the lower reaches and the maximum in Mazhe to Tunpu areas in the middle reaches. The heavy rainfalls usually occurred in the night. For the daily distribution,most of the rainfalls occurred in the time duration from 0 to 8 o＇clock,with the peak rainfall occurred between 4 and 5 o＇clock. After 8 o＇clock,the rainfalls decreased gradually.