摘要
山区线性工程一般穿越沟谷,因缺乏实测资料,设计洪水通常采用暴雨途径推求,其关键环节是设计暴雨计算。分析了滇中山区线性工程所穿越沟谷的各种频率暴雨量与海拔高程的相关关系,并计算区内沟谷断面集水区各种频率的暴雨量。结果表明,区域内暴雨量与海拔高程和集水面积密切相关,区域暴雨量与高程拟合的经验公式具有较高精度;利用经验公式,结合集水区平均高程计算其点暴雨量,再采用点-面折减系数计算设计面暴雨量的方法符合该区域暴雨特征。
The design flood for linear engineering in mountainous area is generally estimated by rainstorm due to the lack of measured data there, so the key point is the design storm calculation. We analyzed the relationship between storm rainfall of dif-ferent frequency and elevation in valley area, and estimated the storm rainfall of different frequency at the cross-section in valley catchment. The results show that the storm rainfall is closely related to the elevation and catchment area;the empirical formula of the area storm rainfall and elevation possesses high accuracy. The design area storm flood could be calculated by using the empir-ical formula, in which the point storm rainfall is estimated according to the average elevation of the catchment area, and then the design area storm rainfall is obtained by using point-area reduction coefficient, the result is accord with the characteristics of rainstorm in those mountainous area.
出处
《人民长江》
北大核心
2015年第15期22-25,共4页
Yangtze River
基金
云南省水利厅水利科技项目(2014003)
关键词
暴雨-高程拟合
集水区
设计面暴雨量
滇中山区
storm-elevation fitting
catchment
design area storm rainfall
central mountainous area of Yunnan Province
