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Numerical Simulation of Pollutant Transport and Accumulation Areas in the Hangzhou Bay

Transactions of Tianjin University 2009年第6期15卷 400-407页

作者：李宁毛志华张庆河 School of Civil Engineering Tianjin University State Key Laboratory of Satellite Ocean Environment Dynamics The Second Institute of Oceanography State Oceanic Administration

Based on the COHERENS model (a coupled hydrodynamic ecological model for regional and shelf seas), a numerical hydrodynamic model of the Hangzhou Bay, influenced by tide, regional winds and freshwater from the Yangtze River and the Qiantangjiang River was established. The Lagrangian particle tracking was simulated to provide tracer trajectories. For convenience, the modeling area was divided into 8 subdomains and the modeling focused on March (dry season) and July (wet season). Numerical simulation and analysis indicate that the tracer trajectories originated in different subdomains are quite different. Most particles released in the mouth of the bay move outside the bay quickly and reach the farthest place at 122.5°E; while particles released in the inner part of the bay mostly remain in the same subdomain, with only minor migrations in two opposite directions along the shore. The tracer experiments also indicate that the northwest region of the bay is an area where pollutant can easily accumulate in both wet and dry seasons, and that the southeast region of the bay is another area for pollutant to accumulate in dry season because it is the main path for the contaminant.

关键词： Hangzhou Bay pollutant transport tracer trajectory COHERENS model wet and dry seasons

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