Water-bloom prediction is important to environmental protection

and the mechanism model of water-bloom is the basis of water-bloom prediction. A model for algae growth was set up based on the analysis and research about the mechanism of water-bloom engendering. The model described the relationship of chlorophyll-a and temperature

solar illumination

overall phosphor

and was applicable to the lakes whose nutrition factor is restricted by phosphor in nutrition circle

without considering the influence of hydrodynamics. And an optimal method of estimating optimal parameters in a nonlinear minimum problem with constraints was proposed. The parameters in the model

such as maximum growth rate of alga

half - saturation coefficient of light

half - saturation coefficient of phosphor

maximum death rate of alga

net loss velocity of alga

and so on

were evaluated by the multi-parameter simultaneous estimation method and validated by experimental data. Through simulation and experiments

the result showed that the model could better describe the change of water-bloom from engendering to burst-out and provide reference for water-bloom prediction and control.