降雨点面折减系数计算方法综述

Review on calculation methods of areal reduction factor

概括了降雨点面折减系数(ARF)的影响因素,包括流域面积、降雨持续时间、重现期、地形、天气类型和季节等,综述了估算ARF的定点定面法和动点动面法的算法过程、基础数据类型和应用范围,分析了各种方法的特点和适用性。指出方法的选择对ARF的计算有显著的影响,ARF的经验法虽然计算烦琐,对数据要求高,但其时间和空间适用性强,仍具有优势。解析法及动点动面法往往依赖于简化的假设,应用范围有限。未来应系统研究各种计算方法的差异,并借助于卫星、雷达等高分辨率降雨数据,开展ARF的空间分析,为工程设计及水文模拟提供更可靠的信息。

The influencing factors of rainfall area reduction factor(ARF) are summarized,including watershed area,rainfall duration,return period,terrain,weather type and season.This paper summarizes the algorithm process,basic data types and application scope of “fixed-point fixed-surface” method and “moving-point moving-surface” method for estimating ARF,and analyzes the characteristics and applicability of various methods.It is pointed out that the selection of methods has a significant impact on the calculation of ARF.Although the empirical method of ARF is cumbersome and requires high data,it still has advantages because of its strong applicability in time and space.Analytical method and “moving-point moving-surface” method often rely on simplified assumptions,and their application range is limited.In the future,systematic research should be carried out on the differences of various calculation methods,and spatial analysis of ARF should be developed with the help of high-resolution rainfall data such as satellite and radar,so as to provide more reliable information for engineering design and hydrological simulation.