天然河道洪峰流量推求方法实例分析

Analysis of an Example of the Method for Estimating Peak Discharge of Natural River Course

采用水力学公式和历史资料相关分析法对天然河道的洪峰流量进行推算分析。水力学公式法一般适用于河道断面有实测比降和糙率的情况,相关分析法适用于无实测比降和糙率断面。两种方法计算分析表明,其计算误差较小,在部分发生较大洪水的特定河段,因种种原因没有施测洪峰流量时,可采用理论推算值来估算洪峰流量,为各级应急防汛部门提供参考建议。

The research adopts hydraulic formula and historical resource related analysis method to analyze and estimate the peak discharge of natural rive course.Hydraulic formula is generally applicable to the measured ratio drop and roughness of fluvial cross section,while correlation analysis method is applicable to the non-measured ratio drop and roughness cross section.The analysis and calculation of two methods indicate that its calculation error is relatively little.In some parts of specific reach with relatively large flood,if there is no measure of peak discharge because of various reasons,we can adopt theoretical estimation to calculate peak discharge,to provide references for emergency flood prevention departments of different levels.