溇水流域降水特征及上游降水对江垭水库来水量影响

Precipitation Characteristics of Lou-River Basin and the Influence of Upstream Precipitation on the Inflow of Jiangya Reservoir

利用中国气象局气象数据统一接口端(MUSIC)提供的降水资料以及湖南澧水流域水利水电开发有限责任公司提供的江垭水库日平均入库流量数据,对溇水流域的降水时空特征及上游降水对水库来水量的影响进行了分析。结果表明,溇水流域年平均降水量1682.5 mm,近58年来整体呈现下降的趋势,并且在上世纪80年代出现了由多到少的突变;春季与秋季降水逐年减少,夏季与冬季降水逐年略增加,雨季开始的时间主要集中在4月份,雨水集中期的分布主要集中6月下旬,雨季结束的时间段主要集中在7月中旬及下旬;鹤峰气象站的年降水总量和江垭水库的年来水总量两者相关性极高,同时江垭水库的洪水与鹤峰气象站48 h内降雨及前期雨量密切相关。

By using meteorological unified service interface community(MUSIC)data supplied by CMA and average daily inflow data of Jiangya reservoir supplied by Hunan lishui river basin water conservancy and hydropower development Co.Ltd,the precipitation characteristics of Lou-river basin and the influence of upstream precipitation on the inflow of Jiangya reservoir have been analyzed,the results show that the average annual precipitation of Lou-River Basin is 1682.5mm,it had a downward trend over the past 58 years and a mutations of more to less in the 1980s,the precipitation in spring and autumn decreases year by year,opposite in summer and winter.The rainy season begins in April,the time of rain concentration is mainly concentrated in late June,the rainy season ends in mid-to-late July.The annual precipitation of Hefeng meteorological station is highly correlated with the annual inflow of Jiangya reservoir,and the flood of Jiangya reservoir is closely related to the rainfall within 48 hours and the previous rainfall at Hefeng meteorological station.