基于ReNuMa模型的长春石头口门水库流域非点源污染负荷模拟

Simulation of non-point source pollution in the watershed of Shitoukoumen reservoir based on ReNuMa model

应用区域营养盐管理模型ReNuMa,以长春市饮马河石头口门水库流域为研究对象开展研究,通过对流域总氮非点源污染的调查和模拟,定量计算和分析了总氮非点源污染时空分布规律。结果表明:该模型在研究区域适用性较好(月径流校准期R2=0.7884,Ens=0.7816;验证期R2=0.7602,Ens=0.7092;月负荷校准期R2=0.7429,Ens=0.7008;验证期R2=0.7066,Ens=0.6618)。时间尺度上,雨季期总氮非点源污染负荷占总量的69%。空间尺度上,饮马河上游流域对非点源污染负荷比例最大,不同土地利用类型的总氮非点源污染负荷不同,耕地贡献比例最大,其次是农村居民点。

In this study,ReNuMa was applied to stimulate the non-point source pollution loading of total nitrogen in the upstream watershed of the Shitoukoumen Reservoir,which is the most important drinking water source of Changchun.Temporal and spatial distributions of non-point TN pollution have been calculated and analyzed quantificationally through the investigation and simulation.On the temporal scales,TN loading during the rainy seasons accounted for 69%.At the spatial scales,the watershed of Yinma River had the highest ratio of TN loading to the total and farmlands contribute the highest NPS loading.