The Research On Normal Storage Level Optimization Model Of Backwater Dam In Songyuan City

This research from the view of system engineering, based on the natural environment, social environment impact analysis of the backwater dam construction project in Song Yuan City , and identify the main environment impact factors of backwater dam project construction; Using principal component analysis to optimized and research quantitatively of comprehensive ecological index system in Song Yuan City; Based on the rational engineering hypothesis, optimizing the normal impoundment level of backwater dam in Song Yuan City, and establish normal water level optimization model on different decision forms of backwater dam construction project in Song Yuan City, the form of a continuous function is to achieve the optimal solution of the normal water level, and characterized quantitatively the relationship among normal water level, project investment and level of the city’s comprehensive ecology.This study have made breakthroughs in the field of the normal water level in the water project optimization methods, filling the blank of research on using the mathematical model optimized impoundment level. By providing a series of economic, engineering, environment etc as quantitative indices data, for managers to develop a more rational, comprehensive decision support.The main conclusions of this study are as follows:(1)Through the qualitative analysis backwater dam project in Song Yuan City on the natural and social environment impacts, preliminary confirming the main natural environmental influencing factor s are: land resources utilization, share of the main city water, reservoir sediment deposition, reservoir water quality and water reservoir structure; Social environment impact factors on the influence of Ha Da Mountain reservoir upstream (i.e. reservoir backwater length) and urban ecological level in Song Yuan City.(2)By methods such as engineering analysis and environmental evaluation, based on the sensitivity of the environmental impact factor, concluded that the environmental impact factors which are sensitive to the normal water level change of backwater dam in Song Yuan City are land resource utilization and Share of the main city water; the impact factors which are not sensitive are reservoir temperature structure and backwater reservoir length; sensitivity uncertain factors are reservoir silt accumulation and reservoir water.(3)Take comprehensive ecological level of Song Yuan City as the research target, setting Song Yuan City comprehensive ecological index system and realize the optimization based on the core index.(4)Using operations research methods realized the normal water level under the condition of different decisions. Research shows that: when the engineering investment costs required minimum for decision-making, the recommended scheme for normal water level is 131.4 m, the environmental impact sensitive factor is primarily urban water share; With the comprehensive ecological benefit are maximum(the comprehensive ecological level is the highest in Song Yuan City) as the conditions for decision-making, the recommended normal water level scheme is 131.83m.,the environmental impact sensitive factor is reservoir silt accumulation. When the engineering investment costs and comprehensive ecological benefit are comprehensively considered, the recommended normal water level scheme is 131.79m, the environmental impact sensitive factor is city comprehensive ecological level.