Abstract:

Combined fuzzy optimization theory with grey correlation method,the grey fuzzy comprehensive assessment (GFCA) has been developed.The grey correlation analysis is the calculation method for membership grade of optimal membership degree in GFCA.The paper gave the principles for ideal environmental sequence building and the trapezoid fuzzy number for qualitative index quantification.In GFCA model,variation coefficient was used to decide index weighting.The research on a comparative election of one high dam and multiple step dams in the Yellow River Basin adopted by GFCA was carried out.The optimal membership degrees of two programs and their six target layers have been calculated,including developmental factor,stable factor,protective factor,economic factor,social accepted factor,and environmental risk factor.Results indicated that multiple step dams program outmatched one high dam program as a whole,from the point of view of protection,the former was much better than the one of the later,〖JP2〗but the later was slightly better than the former in developmental aspect,other aspects were close in the two programs.An agreement of the assessment result with physical situation shows that the GFCA method is available.

Key words: basin hydropower planning/environmental impact comprehensive assessment/fuzzy optimization/relevant analysis/variation coefficient