Phosphorus Transportation Processes in Gehu Lake(I):Model Building

Abstract

通过滆湖磷的来源途径(入湖河道、湖区径流、湖面沉降、养殖技饵、底泥释放)和湖体各要素(水体、浮游植物、大型水生植物、鱼类等)中磷迁移过程调查资料的分析,建立了描述磷在上述各要素中迁移过程的数学模型.经实测资料验证,模型的计算值与实测值的平均相对误差在9.9%-18.6%.基本反映了磷的迁移过程及动态变化规律,对该湖磷浓度预测及磷资源合理利用具有重要的意义.;Phosphorus transportation processes in Gehu Lake are described with dynamic models. Phosphorus fluxes into or out of the lake were measured which stem from river inflow and outflow, land runoff, cage aquaculture, artificial food, release from sediments, atmospheric precipitation, fish and aquatic plants harvest, irrigation and other water resource utilization to or from the Lake. in the model, five differential equations are used to calculate soluble phosphorus, particulate phosphorus, macrophytes, phytoplankton and fish. The solutions of the equations are given, based on the parameters from observation, documentation, or identified data. To verify the model, the data observed in Gehu Lake are used to compare with the calculated results. The model can be used to predict the phosphorus concentration and to rationally utilize the phosphorus resources in the lake.