摘要
在对比分析临界雨量预警指标常用计算方法优缺点的基础上,针对小流域无资料地区,提出以水文水力学为基础,基于24 h设计暴雨的水位流量反推法和基于有效降雨的降雨径流关系曲线插值法综合确定临界雨量预警指标浮动区间的方法,并提出预警时段临界指标系数概念,直观地反映各预警时段山洪灾害的易发程度,为山洪灾害防治工作提供指导依据。经肃州区西沟村5组实例验证表明,研究方法合理可靠,为无资料地区小流域的临界雨量预警指标计算提供了一种新思路。
The merit and demerit of commonly used method to calculate the warning index of critical rainfall has been discussed. A combination of two methods based on hydrologichydraulics to calculate critical rainfall aimed at small watershed of Ungauged Basins was introduced in this paper. Back stepping method of water level and flow based on 24-hour rainfall calculation and interpolation method of rainfall-runoff relation curve based on effective rainfall were the aforementioned two methods. Floating interval was used to represent the warning index of critical rainfall. A new conception named Critical Coefficient to Warning Duration was established to intuitively reflect the easy-happening degree of flash flood at any warning duration. An application example shows that the method introduced in this paper is reasonable and reliable. The method provides a new way to calculate the critical rainfall for small watershed of Ungauged Basins.
出处
《人民珠江》
2016年第9期22-25,共4页
Pearl River
关键词
临界雨量
山洪灾害
水位流量反推法
降雨径流插值法
critical rainfall
flash flood
Back stepping method of water level and flow
interpolation method of rainfall-runoff
