| This ecological simulation model of red tide includes water and biological dynamics, and takes into consideration environmental factors such as tide, tidal current and nutrition. The model is a typical water dynamics equations coupled with diffusion and biology equations as follows: (For the equations please see the PDF file.)
where E and N is the nutrient content and red tide biomass in the sea water respectively.
Numerical simulation is carried out using the Noctiluca scientillans red tide in Dapeng Bay as an example. The model reproduces some characteristics of the Noctiluca scientillans red tide phenomenon in Dapeng Bay, in an attempt to clarify the mechanism and describe the macroscopic process of the red tide occurrence.
The model shows that the sea water nutrient content rises obviously before the red tide appears, and falls to the minimum in the period of red tide peaks. This relates to the fact that large propagation of the red tide organisms needs a great amount of nutrients.
The model also shows that the red tide organisms tend to congregate in the area (such as the comer of the bay) where the water exchange is not strong. |
