HEC-RAS模型在河道治理工程水面线推求中的应用

Application of HEC-RAS Model in Water Surface Profile Calculation of River Management Engineering

为掌握山区复杂流态河流暴雨洪水特性,以吴上湾河大埠口村段河道治理工程为例,利用HEC-RAS软件构建迭代推演水面线分析模型,并结合流域特征值及设计洪水成果,模拟获得控制断面治理前后10年一遇洪水条件下的河道水面线数据。分析结果表明:治理前河道滩地上沙场侵占行洪断面,导致河道水位壅高。通过主河槽扩挖补偿和混凝土挡土墙护岸等措施治理后,河道流速降低、行洪能力增加。HEC-RAS软件对于天然河道复杂流态水文水力计算具有较强适用性,推求数据合理可信。

In order to master the characteristics of rainstorm flood in mountainous rivers with complex flow patterns,this paper uses HEC-RAS software to build an iterative water surface profile analysis model,taking Dabukou Village section of Wushangwan River as an example.It combines the characteristic values of the watershed and the design flood results to simulate and obtain the water surface profile data of the river under the condition of a 10-year flood before and after the control section treatment.The analysis results indicate that before the treatment,the sand fields on the riverbed beach encroached on the flood discharge section,causing the water level of the riverbed to rise.After measures such as compensating for the expansion of the main river channel and protecting the bank with concrete retaining walls,the flow velocity of the river channel has decreased and the flood discharge capacity has increased.HEC-RAS software has strong applicability for hydrological and hydraulic calculations of complex flow states in natural river channels,and the calculated data is reasonable and reliable.