Applications Of POM On Tidal Wave Distribution And Pollutant Diffusion In The Taiwan Strait

The Princeton Ocean Model (POM) has been used to simulate tidal wave distribution and pollutant diffusion in the Taiwan Strait. The calculated tidal elevation and current and tidal harmonic constant for M₂ are compared with the observed data. It is indicated that the calculated results are reasonable and consistent with the observed ones.The numerical study on the Taiwan Strait could be classified as followings, from which conclusions are made.(1) The Princeton Ocean Model (POM) has been used to do the numerical study on the M₂ tidal wave in the Taiwan Strait. After a serials of sensitive numerical experiments, it is revealed that topography and reflective condition in the Taiwan Strait play important roles in the tide field, and the strong tide field with large tidal range at the middle of the west coast may be caused by the co-operation between tidal wave accumulation in shallow-water area and reflective condition.(2) Including the oceanic circulation, the Princeton Ocean Model (POM) has been used to stimulate the pollutant transport field in the Taiwan Strait. In this model, the Chemical Oxygen Demand (COD) from Jiu-long river in 2006 has been considered as the pollutant source, and a two dimensional and three dimensional (2D-3D)nested grid skill has been applied.(3) With the represented pollutant diffusion charts in four seasons, it is shown that: a) The 2D-3D nested grid skill is helpful in stimulating the pollutant concentration field in the region from Xiamen Bay to the middle of the Taiwan Strait. b) The concentration around Jinmen Island is less than 0.4mg/l, and along the west coast is between 1.0～0.01 mg/l. c) Because of the well vertical mixing pattern caused by the strong northeastern monsoon, the vertical structure of the COD is not obvious. But in summer the concentration field in the surface layer is wider than that in the middle and bottom layers, because of the weak southwestern monsoon and stratification. d) The concentration field in the Taiwan Strait is influenced a lot by the circulation, so the seasonal change turns out to be obvious.(4) Based on the Princeton Ocean Model (POM), a three-dimensional coupled nesting model has been established. And the COD concentration both in the Taiwan Strait and Xiamen Bay in 2006 has been simulated. (5) The pollutant charts of Xiamen bay show that: a) The simulation is reasonable compared with the observed data. b) It is indicated from the charts of the three layers that the vertical structure in Xiamen bay is not obvious. However, the charts of the Taiwan Strait show that: the result in Taiwan Strait is not as good as the ones without coupled grid-nesting.