区域骨干感潮河道行洪排涝能力研究

Study on flood carrying and drainage capacity of a regional main tidal river

以区域骨干感潮河道——灌河为研究对象,采用MIKE 11 HD模块,构建了一维水动力数学模型。利用实测水文及河道断面资料,选取相关系数和纳什效率系数作为评价指标,验证了模型并确定相关参数。根据区域水利规划要求,分析了灌河现状及规划不同工况下过流能力,评价了工程的安全性。结果表明:当灌河糙率时,模拟结果的相关系数和纳什效率系数最优;灌河干流现状过流能力可满足区域规划要求,其大部分堤顶高程满足行洪排涝安全要求,个别堤段需加固治理。计算结果较好地反映了灌河河道过流状况,可为类似工程分析计算提供参考。

By taking a regional main tidal river——Guanhe River as the study object,a 1- D hydrodynamic model is established with MIKE 11 HD module. The model is verified and the relevant parameters are determined with the measured hydrological and river channel section data by selecting the correlation coefficients and Nash-Sutcliffe efficiency coefficient as the evaluating indexes. In accordance with the regional water resources planning,the status and planned water carrying capacities of Guanhe River under various operation conditions are analyzed,while the safeties of the relevant projects are assessed as well. The result shows that when the roughness of Guanhe River n = 0. 020,the correlation coefficients and Nash-Sutcliffe efficiency coefficient of the simulated result are optimal,and then the status water carrying capacity of the main stream can meet the requirement of the regional planning,of which the elevations of most of the dike crests can satisfy the safety requirement on the flood carrying and drainage,yet only a few dike sections are necessary to be improved. Generally,the calculation result better reflects the water carrying status of Guanhe River channel and can provide a reference for the analysis and calculation to be made for the similar project concerned.