混合有限分析法在桥墩综合壅水叠加模拟中的应用  

Application of hybrid finite analytic method in numerical simulation of synthetical dammed water by bridges

作　　者：方神光 余顺超 黄胜伟 

机构地区：[1]珠江水利委员会珠江水利科学研究院,广东广州510611

出　　处：《长沙理工大学学报（自然科学版）》2010年第2期53-57,共5页Journal of Changsha University of Science and Technology:Natural Science

基　　金：水利部公益性行业科研专项经费资助项目(200901032)

摘　　要：将一种纯隐格式-混合有限分析法推广到实际工程应用中.采用该方法对曲线坐标系下的二维水流数学模型进行了离散,将常用的干湿节点判别标准与冻结法结合起来,有效提高了模拟计算的效率和稳定性.采用建立的二维水流数学模型和该计算方法,有效地模拟和重现了柳州市柳江河道上最近发生的洪水.计算和分析显示,柳州市柳江河道上当前已有桥梁由于间距太近,形成了显著的壅水叠加现象.采用经验公式计算了各单个桥梁的壅水高度,与数值模拟计算结果较为吻合.A pure implicit numerical scheme-hybrid finite analytic method is extended to the solution of two-dimensional shallow water mathematical model under curvilinear coordinate in practical projects.The method of freezing and standard of distinguishing dry-flood grid nodes are used together to deal with beach existing in computational area,which improve the efficiency and the stability of calculations.One recent flood in Liujiang River in Liuzhou City was simulated and recurred with the mathematical model and the numerical method.Results show that too many close bridges led to obvious synthetical dammed water.Dammed water by single bridge was calculated simultaneously with empirical formula,which accorded well with that by numerical simulations.

关 键 词：混合有限分析法 二维水流数学模型 桥墩 阻力概化 

分 类 号：TV148.2[水利工程—水力学及河流动力学]