Numerical Simulation and Assessment of Phosphorus Pollution Sources in Lake Gehu and Lake Changdang
Focusing on the problem of total phosphorus pollution in the typical areas of Gehu Lake and Changdang Lake in Taihu Lake Basin,the numerical simulation and evaluation of the spatial and temporal distribution characteristics of non-point source phosphorus pollution load were carried out by using the nested mathematical model simulation method at the basin-regional scale.The characteristics of non-point source pollution in the three industries of industry,life and forestry in the region were analyzed.The results show that the total non-point source phosphorus pollution load of indus-try,life and forestry in Gehu Lake and Changdang Lake was 100.32 t/a.From the perspective of spatial distribution characteristics,the high-risk areas of non-point source phosphorus pollution in the two lakes are Wunan small watershed,Songjian Lake small watershed,Henglin small watershed in Wujin District,Huaxing small watershed and urban small watershed in Jintan District.From the perspective of industry distribution characteristics,the proportion of industrial non-point source phosphorus pollution in Gehu Lake and Changdang Lake area is the highest,followed by domestic non-point source,and the proportion of forestry non-point source is the lowest.The contribution ratio of three types of non-point source phosphorus emissions to regional total phosphorus pollution is 75:22:3.The industrial,domestic and for-estry non-point source phosphorus pollution emissions showed that the third quarter was significantly higher than other quarters.
pollution traceabilityphosphorus pollutionnumerical simulationGehu LakeChangdang Lake
NETL
NSTL
万方数据
维普
