A THREE DIMENSIONAL BAROCLINIC FLOW NUMERICAL MODEL IN ESTUARINE AND COASTAL REGIONS USING DOUBLE SIGMA COORDINATES SYSTEM

摘要：

The horizontal baroclinic pressure gradient force estimation is problematic over steep topography in sigma coordinate models. The artificial pressure gradient error may create artificial flow and affect simulation accuracy. A double sigma coordinates system is introduced to keep the virtues of sigma coordinate in the vertical direction. A new 3-D baroclinic flow numerical model for estuarine and coastal regions using double sigma coordinates system is presented in this paper. Furthermore, the truncation errors of pressure gradient force are estimated. Finally, the single sigma coordinate model and the double sigma coordinate model were applied to estimate pressure gradient error with a steep seamount configuration. The result of numerical experiment shows that the errors caused by horizontal baroclinic pressure gradient forces in double sigma coordinates model over steep topography regions will be substantially reduced.

关键词： Estuarine and coastal 3-D baroclinic flow Numerical modeling Sigma coordinates system Horizontal baroclinic pressure gradient force

作者: Jianfeng Tao Changkuan Zhang

作者单位: College of Ocean, Hohai University, Nanjing 210098, China

会议类型: 国际会议

会议名称: 第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)

会议地点: 南京

会议语种:英文

页码: 1178-1185

在线出版日期: 2008-10-20（万方平台首次上网日期，不代表论文的发表时间）