Numerical simulation of the pollutant transportation in Chinese Hangzhou Bay with the QSCAT/NCEP wind data

摘要

Hangzhou Bay in China is an important conveyor transporting contaminants from surrounding cities in Yangtze Delta. A numerical hydrodynamic model based on COHERENS (Coupled Hydrodynamical Ecological model for Regional Shelf seas) has been employed to simulate the pollutant transport trajectory and to obtain the retention ratio in the Bay. The forcing of the model include tides and freshwater. The influence of wind was explored by imposing the QSCAT/NCEP Blend Wind data into the numerical simulation.rnThe bay was divided into 8 subdomains (S1—S8) and the simulation was performed in two months: March (the dry season) and July (the wet season). Two sets of numerical experiment were carried out with or without wind. Results indicated that wind plays a more important role on pollutant transport in the wet season than in the dry season. The influences of wind on the pollutant transport in 8 subdomians are different, especially in wet season. The retention ratio of S1 is most significantly affected by wind compared with other subdomains.