基于INVEST模型的黑水河流域水质风险评估

Water Quality Risk Assessment in Hehui River Basin Based on INVEST Model

流域营养盐负荷研究和水质风险评估对于流域栖息地的修复和建设尤为重要,基于生态系统服务和交易的综合评估模型——INVEST模型,构建产水量和水质净化模块来模拟黑水河流域氮磷营养盐输出负荷和浓度的空间分布,并在此基础上对威胁流域水质的重要因素进行权重分析。结果表明:黑水河流域氮磷营养负荷的高低与流域土地利用方式和开发强度密切相关,城镇建设(人口)、养殖、农业面源、采石采砂等是影响子流域水质状况的主要威胁源。

Watershed nutrient load research and water quality risk assessment are very important for watershed habitat restoration and construction.The water yield module and water purification module of INVEST model are used to simulate the spatial distribution of nitrogen and phosphorus nutrient output load and concentration in the Blackwater River basin,and on this basis,the weight of the important factors that threaten the water quality of the basin is analyzed.The results show that the load of nitrogen and phosphorus is closely related to the land use pattern and development intensity,town construction(population),farming,agricultural non-point source,quarrying and sand mining are the main threats to the water quality of sub basins.