Study On Comprehensive Environment Impact Assessment In Reservoir Area

The environmental impact factors are complicate and variable in reservoir area, and these factors are inter-influential. Environmental impact is probable changes of physics, chemistry, organism and social economy in environmental system after construction reservoir, or a new environmental creation. Environmental impact assessment recognizes, forecasts, and assesses to environmental system after practicing the planning construction reservoir. Environmental impact assessment for the reservoir area studied in this thesis includes three following aspects.1. Establishment of environmental impact assessment systemEnvironmental system is a complicate system and composes a lot of factors .On the basis of a systematical separate principle, assessment aim is separated a certain second-system, and those second-system are re-separated a certain environmental factors. The whole system forms a multi-level structure model from highest level to lowest level. Assessment system in this thesis is made of four levels, namely environmental totality, environmental second-system, environmental component and environmental factor.2. Establishment of environmental impact assessment modelRelative importance of environmental factors is defined by application of environmental expert system, structuring judgment matrix. On the basis of fuzzy gather theory, the model of multi-fuzzy comprehensive assessment is constructed. The fuzzy comprehensive assessment to suffering impact factors is a method of effective policy decision of full assessment.3. Environmental impact assessment to Longtan hydropower stationBase on full analysis environmental impact factors to Longtan hydropower station, the environmental impact assessment system is constructed, defining weight of impact factors of levels. Application of fuzzy comprehensive assessment method is to assess environmental impact of Longtan hydropower station. According to assessment result, Longtan hydropower station to environmental impact is only common, and don't bring about stronger environmental changes. However, Longtan hydropower station still creates stronger environmental changes in water quality, river depositing, fish swimming and emigrant, which are fully thought over in environmental protection design.