基于临界雨量的陕南地区无资料小流域山洪灾害预警研究  

Research on Flood Warning Based on Critical Rainfall in Small Watershed of Ungauged Basins in the South of Shaanxi

作　　者：王云[1] 张鑫[1] 王文亚[1] 苏夏羿 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《中国农村水利水电》2017年第8期92-95,102,共5页China Rural Water and Hydropower

基　　金：国家高技术研究发展计划("863"计划)项目(14110209);国家科技支撑计划项目(2011BAD29B01);中央高校基本科研业务费科研创新重点项目(Z109021202)

摘　　要：临界雨量预警指标是小流域山洪灾害预警预报的重要依据。本文针对陕南地区无资料小流域,采用水位反推法计算三种不同前期土壤含水量P_a的临界雨量,确定前期土壤含水量对临界雨量的影响。研究结果表明:采用推理公式法计算洪峰流量比较符合实际;临界雨量值随着土壤含水量的增大而减小;土壤含水量对临界雨量的影响随着时段的增长而增大。水位反推法简单易行,对陕南地区无资料小流域临界雨量预警指标的确定具有较好的适用性。The warning index of critical rainfall is an important gist in warning and forecasting mountain torrent disasters in small watersheds.In order to analyze the effects of antecedent soil moisture content（Pa） to critical rainfall,this paper calculates the critical rainfall of three soil moisture contents by using the inverse-water level,which was aimed at small watershed of ungauged basins in the south of Shaanxi. The results show that it is accordance with the actual circumstances better by calculating the designing peak flow with rational formula. The critical rainfall decreases with the increase in Pa under different soil moistures. The effect of Pa on critical rainfall is increscent with the growth of time. The inverse-water level method is simple and easy,and it is applicative in small watershed of ungauged basins in the south of Shaanxi.

关 键 词：临界雨量 推理公式法 水位反推法 山洪灾害 

分 类 号：TV125[水利工程—水文学及水资源] S422[农业科学—植物保护]