山洪灾害临界雨量分析计算方法研究

Research on critical precipitation amount computation method of mountain torrential flood disaster

一个流域或区域某一时间段内降雨量达到或超过某一量级和强度时,该流域或区域将发生山溪洪水、泥石流、滑坡等山洪灾害,把这时的降雨量或降雨强度,称为该流域或区域的临界雨量(强)。临界雨量(强)是一项指标,对于山洪灾害防治有着重要意义。采用水文部门现有雨量站网的雨量资料,并利用气象站网雨量资料作为补充,提出了临界雨量的分析计算方法,同时也给出了资料缺乏和无资料区域或流域临界雨量的估算方法。通过对典型区域的实例分析,证明提出的方法是可行的。

When the precipitation amount in a time interval in a basin or region reaches a certain amount order or intensity,flood disasters,such as mountain torrent,mud-rock flow,landslide etc.,will occur,and the precipitation amount or intensity at this time is known as the critical precipitation amount(intensity) in the basin and region.The critical precipitation amount(intensity) is an index which is of significance for the prevention and treatment of disaster caused by torrential floods.An analysis and calculation method for critical precipitation amount is put forward by using precipitation data from existing hydrological observation network,with precipitation data from meteorological observation network serving as supplementary data.An estimation method for critical precipitation amount in regions with less or no precipitation data is also given.The provided methods have been proved to be feasible through analyzing case histories in typical regions