Modeling Of Non-point Source Pollution In Wetland Systems-A Case Study In The HuoLin River Watershed

In comparison with point source pollution caused by industrial wastewater and municipal sewage discharges which have been effectively controlled,non-point sources(NPS) have become the major reason of water quality degradation and raised growing concerns in the area of water management.Issues caused by NPS in HuolinRiver watershed are increasingly getting worse.The fact is that it contains amount of wetlands resources.Thus,ignoring the ecology function of wetlands will lead to the improper decisions about NPS mitigation controls.Taking all above into account,SWAT is being used to simulate the production and transportation of the NPS pollutant in HuoLinRiver basin.The loadings of NPS pollutants are calculated for different hydrologic years and the spatial and temporal characteristics of NPS pollution are studied.This thesis mainly contains three parts.The first part is that the basic data of the study area are collected and processed for the model.After all input database is already prepared,LHS-OAT(Latin Hypercube Sampling-One factor At a Time) is applied to analyze parameters sensitivity.Then,SWAT model is calibrated and verified with observed data for the study area by using SUFI method.At last,the calibrated model is used to calculate the loadings of NPS pollutants.The results are helpful for watershed NPS pollution management.