关键词: 暴雨洪水, 水科院推理公式法, 林平一法, 参数敏感性分析, 坡面排水设计

Abstract: For slope drainage design with slope length less than 1.5km, the project often lacks sufficient hydrological information and data. The choice of design storm flood calculation parameters determines the reliability of storm flood design. IWHR reasoning formula method and Linpingyi method were used to verify each other. The influences of each parameter' change on calculation results were analyzed. Parameters' sensitivities were studied by using the standard deviation. The results showed that the two algorithms had similarities and many common parameters. Using the two algorithms to verify the design of rainstorm flood on small-area slope can improve the credibility of the calculation results. In the two algorithms, the parameters of F, J,(H24,n1 and m were positively correlated with the flow. The parameters of L, μ and N0 were negatively correlated with the flow. The sensitivity order of each parameter in the IWHR reasoning formula method was FQ>n1Q>(H24Q >LQ>mQ>JQ>μQ; the sensitivity order of each parameter in Linpingyi method is FQ0>(H24Q >L0Q>n1Q> N0Q>J0Q>μQ. For a slope drainage project with a defined slope length less than 1.5 km, the calculation results of designing storm flood were mainly affected by the parameter's m value or N0 value. By using Linpingyi method, the deviation of confluence parameter m value in the IWHR reasoning formula can be reduced effectively, and the calculation results of storm flood in small-area slope design were more in line with the actual situation. This study can provide support for slope drainage design.

Key words: storm flood, IWHR reasoning formula method, Linpingyi method, parameter analysis, slope drainage design;