NUMERICAL SIMULATION OF 1998 RED TIDE OF THE BOHAI SEA
摘要
Algal bloom,known as red tide,has occurred frequently in the Bohai Sea in recent decades causing great economic losses to fisheries as well as having significant adverse impact on the environment. A 3-D Eco-Hydraulic model is developed to simulate the explosive propagation of diatom and dinoflagellate as a function of the concentration of various nutrients,river inflow,tide,temperature,wind,sunshine and rainfall. The model is intended to answer the questions ofhow the 1998 Bohai Sea red tide occurred,and to investigate how environmental factors,such as temperature,wind,rainfall,solar radiance,sea currents and nutrients,affect the algal bloom process. The parameters employed in the model are calibrated with the data collected in the periods 1982-1983 and 1992-1993. Results from the model indicate that eutrophication of the seawater is the basic condition for algal bloom,and that the 1998 red tide was triggered by the abnormal warm weather in August and September.