沙澧河上游关键区汛期强降水面雨量对洪峰的影响

Influence of Area Rainfall of Heavy Precipitation on Flood Peak in the Key Area of Sha-li River Upstream in Flood Season

根据河南省气候中心提供的1980-2000年6月1日至8月31日沙澧河流域上游关键区所选取测站逐日20时-20时降水实测资料,建立了面雨量库,并利用统计方法分析了沙澧河上游关键区面雨量气候特征以及面雨量与洪水的关系,结果表明:沙澧河上游关键区面雨量年际变化非常大,且年面雨量趋势是增加的。沙澧河流域上游关键区汛期逐月月平均面雨量以7月最多,其次是8月,6月最少,并且6月和7月月平均面雨量有增加的趋势,而8月则有减少的趋势。强降水面雨量预报对于预测洪峰有很好的指示意义。

In this paper,according to the daily precipitation data at 20—20 in the key area of Sha-li river upstream in June—August,1980—2000 provided by Henan Provincial Climate Centre,the paper established the area rainfall database and analyzed the climatic characteristic of area rainfall as well as the relation between area rainfall and the flood peak using statistical method.The results show that annual variation of area rainfall in the key area of Sha-li river upstream is large,and the trend is increasing.In flood season,the largest month of average monthly area rainfall is July,and the least is June,August in middle,moreover,the trend of June and July is increasing,while the trend of August is decreasing.The forecast of area rainfall of heavy precipitation has good indication meaning over the flood peak.