Modeling the Biomanipulation in Eutrophic Shallow Lakes

A biomanipulation method, culture of Hyriopsis Cumingii is applied in Xikeng reservoir, Shenzhen, China, to resolve the eutrophication problem of the reservoir. The experiment had been carried out from April, 2001 to March, 2004. In order to simulate the effect of biomanipulation on eutrophication, in this paper a numerical model of biomanipulation in shallow water body (lakes, reservoirs) is proposed. 10 state variable were described in the dynamic model: carbonaceous biochemical oxygen demand (CBOD), dissolved oxygen (DO), ammonia (NH3-N), nitrate (N03), organic nitrogen (Org-N), inorganic phosphorus (P04), organic phosphorus (Org-P), phytoplankton, zooplankton and mussel. The model is applied to Xikeng Reservoir to simulate the distributions and changes of nutrient and algae after the biomanipulation. The model is validated using measured data and the calculated results show well agreement with the measured data. The effect of biomanipulation on water quality in Xikeng Reservoir is simulated and analyzed.