基于SWAT模型的大通湖垸生态需水量研究 The Study of Ecological Water Supplement in Datong Lake-Polder Based on SWAT Model

采用SWAT模型对大通湖垸的年平均径流过程以及非点源氮磷负荷进行模拟。结果表明：SWAT模型能够较好的模拟大通湖垸自然状态下的径流过程以及非点源氮磷分布，径流模型的效率系数和决定系数达到了0.79和0.67。氨氮和总磷负荷模型的决定系数分别达到了0.64和0.58。结合SWAT模型采用功能分析法计算了维持大通湖垸内水体正常生态环境功能所需的最小生态补水量。研究不同水文时期生态补水量，可以为大通湖垸内水资源的合理利用和调度提供理论依据。 In this study, the SWAT model was applied to simulate the annually average runoff and Non-point source nitrogen and phosphorus load in Datong Lake-polder. The results indicate that SWAT model could simulate the runoff processes and nitrogen and phosphorus distribution quite well in Datong Lake-polder. The Nash-Sutcliffe coefficient (ENS) and the coefficient of determination (R2) of model reach 0.79 and 0.67. Coefficient of determination (R2) of nitrogen and phosphorus model reaches 0.64 and 0.58. In addition, using function analysis method combined with the SWAT model calculated minimum ecological water supplement for the normal function of the ecological environment in Datong Lake-polder. The research of ecological water supplement can provide a theoretical basis for the rational use and scheduling of water resources in Datong Lake-polder.