大河三角洲河口海岸演化机理模型研究:(II)模型构建与实证
收稿日期: 2002-07-22
修回日期: 2002-12-20
网络出版日期: 2003-04-15
基金资助
国家自然科学基金资助项目(40271020);中国科学院知识创新工程方向性项目(KZCX220705、KZCX220201);中国科学院知识创新工程领域前沿项目
Researches on dynamics model and numerical simulation of the large-scale estuarine shoreline evolution: (II) numerical modeling and a case study
Received date: 2002-07-22
Revised date: 2002-12-20
Online published: 2003-04-15
王凯, 李国胜, 方国洪, 李柏良 . 大河三角洲河口海岸演化机理模型研究:(II)模型构建与实证[J]. 地理研究, 2003 , 22(2) : 140 -150 . DOI: 10.11821/yj2003020002
Based on a z coordinate 3D baroclinic numerical modeling (ZOM) developed by Fang & Yu (1998), currents (include tidal current) of the Bohai Sea are diagnostically simulated considering the wind driven circulation and thermohaline circulation. The splitting mode technique is used in model discretization and forward elimination and back substitution is employed in solving water elevation equation. The advection, bottom friction, buoyancy, and vertical eddy viscosity are elaboratedly treated in order to keep numerical stabilization. The horizontal resolution is 10′. There are 5 layers in vertical. The numerical results coincide with observation data quite well when comparison between the calculated current and observation data in an oil rig of the Bohai Sea during Dec. 1995 to Sep. 1996. The deviation of current direction between the calculation and observation is smaller than 14.8°,while that of current speed is 8.8cm/s(23%). A modified Bagnold load sediment formulas is used in mass transport model. The suspend sediment transport is calculated according to formular given by Dou et al. (1995). The numerical sediment transport model shows that the head of the Bohai Bay and Liaodong Bay are alluvial sea areas. In the rest sea area of the Bohai Sea, especially in the Bohai Strait, appears erosion area. In order to calibrate the numerical results, a comparison between the numerical output and secular changes of the depth of the Bohai Sea during recent 50 years is achieved, and the result illustrates the consistent change pattern. Of course, this paper is only a preliminary research on connection of the physical process and sediment process. In next step, the function of ocean wave, fresh water dilute, cohesive sediment transport, sediment entrainment and near shore process will be considered in the model.
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