Risk Assessment System for Non-point source Pollution in Small Mountain Watersheds of the Three Gorges Reservoir Area:A Case Study of Huangjin River Basin
The plantation production in the mountainous sub-watersheds of the Three Gorges Reservoir Area is distributed in units of blocks.The plantation blocks can be used as the basic unit to implement non-point source pollution control.The risk assessment of non-point pollution in mountainous small watersheds includes four sub-processes:block division,risk identification,risk assessment,risk prevention and control.By constructing a risk evaluation model focusing on the screening and quantification of risk factors,and by establishing a supportive evaluation index system in the dimensions of source factors and migration factors,the risk assessment of plantation non-point pollution was carried out and graded.The targeted control and management of plantation non-point pollution was proposed in three aspects:source control,process control and end control,based on the influence of single index.Based on the influencing degree of single index,we proposed several targeted control measures for plantation non-point pollution control in three aspects including source control,process control and end control,to guide an improved management strategy.
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