基于推理公式的山洪预警雨量计算方法研究

基于水科院推理公式,从山洪雨量预警需求出发,解除原公式在部分汇流中对流域面积分配曲线的矩形概化,经反演得出各典型时段临界雨量计算式;同时采用等流时方法,有效解决了计算式中最大部分汇流面积的定量问题。研究提出的预警雨量计算方法,物理概念清晰,易于理解和掌握,计算便捷,且无需水文资料,可作为现行山洪预警雨量分析计算的一种新方法。

Calculation Method of Flash Flood Warning Rainfall Based on Reasoning Formula

Based on reasoning formula, according to the flash floods rainfall warning requirement, the study removed the rectangular generalized of watershed area distribution in some concentration flow from the original formula, and made an inversion to obtain the critical rainfall calculation formula for the various typical durations, and then used isochrones method to solve the quantitative problem of the most concentration flow area in the calculation formula. The proposed calculation method of the rainfall warning has a clear physical concept, is easy to understand and master, is convenient for calculation, and is unnecessary to use hydrological data, which can be used as a new method for analysis and calculation of the flash flood warning rainfall.