HEC-RAS模型在桥墩壅水计算与影响分析中的应用

HEC-RAS是一种一维水动力模型,采用HEC-RAS中的恒定流模型对上犹江特大桥施工期和建桥后进行壅水分析和计算.计算得上犹江特大桥施工期5年一遇洪水最大壅高值为0.02 m;建成后10年一遇、20年一遇以及50年一遇洪水最大壅高值分别为0.01 m、0.02 m和0.03 m;大桥的兴建引起的壅水较小,因此对河道行洪安全影响较小,对河段上游河段排涝影响较小.HEC-RAS中的恒定流模型基于能量方程,利用该模型对桥墩进行壅水计算及防洪影响进行分析,参数设置简单,断面布设方便,值得推广.

Application of HEC-RAS model in the analysis of pier backwater calculation and influence

HEC-RAS is a one-dimensional hydrodynamic model. Constant flow model in HEC-RAS model can be used for analysis and calculation of Shangyoujiang bridge backwater during construction period or upon completion.The results showed that the maximum backwater height value is 0.02min the event of a 5 year flood during construction period of Shangyoujiang bridge. The maximum backwater height value is 0.01m, 0.02m, 0.03m in the event of 5 year,10 year, 50 yearflood aftercompletion of Shangyoujiang bridge.Due to the construction of the Shangyoujiang bridge backwater is very small .its impact on river flood safety is smaller, and less impact on the upper reaches of river drainage. By incorporating the energy balance equation, constant flow model in HEC-RASmodel canbe usedin analysis of pier backwater calculation and influence. The parameter setting is simple, the section layout is convenient, and it is worth popularizing.