XU Weiyi, ZHU Dedi, BU Xianwei, CHEN Gengxin, Second Institute of Oceanography of SOA, Key Laboratory of Ocean Dynamic Processes and Satellite Oceanography, SOA

Abstract

The occurrence of HAB is not a single ecological problem. It is the one under the control of marine dynamic environment. Present research shows the numerical simulation for four cases to manifest the important function of dynamic condition in the occurrence and the spread of HAB. Those cases are a) the whole process of the HAB which really occurred in the sea area near Hongkong, in spring in 1998. b) Decrease tidal amplitude for two thirds only without changing other parameters. c) Change the diffusion term only without changing other parameters. d) change the environment topography(through marine construction) only without changing other parameters. Those simulation results show that the dynamic condition play the function not only in the movement of HAB materials but also in the occurrence of HAB. It could control the occurrence of HAB sometimes.