弯曲河流三维数值模型  

Three-dimensional numerical model for the meandering flow

作　　者：李艳红[1] 周华君[2] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院港口与海岸工程系,上海200030 [2]重庆交通学院河海建筑工程系,重庆400074

出　　处：《水动力学研究与进展（A辑）》2004年第z1期856-864,共9页Chinese Journal of Hydrodynamics

摘　　要：　将平面正交曲线坐标系和垂向σ伸缩坐标系相结合,建立适合弯曲河流的三维水流数值模型。采用模式分裂技术将控制方程分解为外、内模式联合求解,方程的离散采用有限差分法。采用嘉陵江广元城区河段5个弯段内7个典型横断面地形、水位和流速资料对本文模型进行验证,模型成功地模拟出了水面横比降和弯道二次流,模拟结果与实测数据吻合较好。A 3-D numerical model for the meandering river flow is developed based on the orthogonal curvilinear coordinate system and σ coordinate system. The numerical model is divided into external mode and internal mode using mode splitting technique. The water surface elevations and flow velocities are solved using finite difference schemes. This model is verified by the data from the passage of Guangyuan in the Jialing River. The water surface elevations and flow velocities,especially the cross-sectional slope of water surface elevations and secondary flow patterns in a meandering channel are successfully simulated. The data of the simulated and the measured show a good agreement.

关 键 词：弯曲河流 三维数值模型 模式分裂技术 有限差分法 水面横比降 弯道二次流 

分 类 号：P343.1[天文地球—水文科学]