| 摘要: |
| 为了长时间、大范围研究渤海中悬浮物的输运规律,研究应用并改造了德国汉堡大学的粒子追踪悬浮物输运的三维模式。模式中考虑了风、气压等气象要素及外海传入的潮波作用下的三维正压海流对悬浮颗粒物的输运;同时考虑了悬浮颗粒物的沉降及再悬浮机制和底质中的细颗粒物的运动,将风浪的作用引入了悬浮物输运的计算。数值模式应用的是粒子追踪方法,能较好地反映悬浮物浓度的迅速变化。 |
| 关键词: 悬浮物 输运 海流 风浪 数值模式 |
| DOI：10.11693/hyhz200006016016 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，49806007号;国家教委博士点基金资助项目，97042305号;国家重点基础研究发展规划资助项目，G1999043804号 |
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| 3D SUSPENDED PARTICULATE MATTER TRANSPORTATION MODEL IN THE BOHAI SEA I. INTRODUCTION OF THE MODEL |
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JIANG Wen-sheng, SUN Wen-xin
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Institute of Physical Oceanography, Ocean University of Qingdao, Qingdao, 266003
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| Abstract: |
| Nowadays people pay more and more attention to the study of the transport of suspended particulate matter (SPM) because of the important role it plays in marine ecosystem and coastal engineering. In order to study the long term SPM transport pattern in the Bohai Sea a SPM model which is developed in Hamburg University in Germany is modified and applied. It is a 3D random tracer model which consists three parts: (1) the movement of the SPM in the water body, (2) deposition and erosion process at the seabed, and (3) the movement of the sediment fine fraction at the sea bottom.
SPM in the water is driven by the current which is calculated beforehand by using a three dimensional barotropic circulation forced by the meteorological factors such as wind, air pressure and tidal wave propagating from the deep ocean. It is assumed that the velocity of the SPM is equal to the water velocity minus the sinking velocity of itself. Thus the deposition process is included. The wind wave is considered in the resuspension process of the SPM. Its influence is stronger than current. The sea bottom is treated as a limited source of the SPM.
The numerical scheme is according to a PIC (particle in cell) method. The SPM in one grid is split into many small particles, which are traced according to the current field in the advection step, and a random walking is performed to simulate the diffusion process. Thus the new positions of all the particles can be determined and the SPM concentrations are obtained.
SPM transport is a very complicate process. In this study the major processes are included. This model can be used to study the SPM concentration pattern on a large time scale. Since at present not all the mechanisms concerning the SPM transport are fully understood, the numerical simulation need to be improved. |
| Key words: Suspended particulate matter, Transport current/wind wave, Numerical modeling |
