海洋赤潮生态模型参数优化研究

STUDY OPTIMIZATION OF THE PARAMETERS or A MARINE ECOSYSTEM DYNAMICS MODEL FOR RED TIDE

根据中日合作海洋生态围隔试验观测资料，对乔方利等１９９８年提出的赤潮过程生态模型（乔方利等，２０００）进行参数优化研究，得到赤潮过程营养盐半饱和常数：硅藻，ＫＮ＝１．４μｍｏｌ／Ｌ、ＫＰ＝０．１２９μｍｏｌ／Ｌ、ＫＳｉ＝１．１６μｍｏｌ／Ｌ；鞭毛藻，ＫＮ＝０．３４５μｍｏｌ／Ｌ、ＫＰ＝０．１１３μｍｏｌ／Ｌ以及其它等共１８个参数的最优取值，并详细讨论了目标泛函的构造和多目标函数参数优化的方法。

Whether the ecosystem parameters were evaluated well and truly was a key factor which determines the precision of an ecosystem dynamics model; in fact an overwhelming majority of researchers specified the parameters by experience or by experiment This paper tried to construct an objective function in order to assess the validity of a common ecosystem dynamics model in advance, and then specified the parameters according to a set of equations only under the control of which the objective function could get its extremum. On different premises of in situ observations, three forms of objective functions were constructed. Each objective function was applied to optimize the parameters. Furthermore, the result of ecosystem dynamics model and the values of parameters were compared with data and literatures; the model's result came close to data more and the parameter values were under the scope of the relative values in literatures. The proposed optimization method to evaluate the ecosystem parameters was a new application of classical mathematics theory, and this method could partially replace expensive situ observation in ecology research and relevant experiments. It was more important that the preliminary numerical experiment showed this method's validity.