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《Journal of Safety and Environment》 2012-03
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On the synthetic evaluation of the GIS-based variable weight of the urban geological engineering environment quality

ZHANG Ying-ping1,2,SHI Jian-sheng1,LIU Chang-li1,GOU Zi-qiang3,FAN Hui-jie3(1 Institute of Hydrogeology and Environment Geology,CAGS,Zhengding 050803,Hebei,China;2 Chinese Academy of Geological Sciences,Beijing 100037,China;3 The 4th Geological Team of Hebei Geology and Mining Bureau,Chengde 067000,Hebei,China)  
In this paper,we would like to introduce the variable weight theory into the system of urban engineering geological environment quality evaluation.The method we introduce here involves three stages.In the first stage,the goal is to establish the index system for quality evaluation of urban geological engineering environment based on study of the characteristics of the urban engineering geological environment.The goal of the second stage is to calculate the constant weights,known as "the basic weights",by the analytical hierarchy process.And,the goal of the third stage is to build up a segmented strong penalty-incentive variable weight synthetic model according to the data types of the indexes and evaluation precision requirements.If the above said three stages were done,it would be possible to double the spatial analysis capacity of the quality evaluation of the urban geological engineering environment.By applying the device,we have done the related evaluations of the constant weight and the variable weight respectively for the main urban areas of Zhengzhou City.The analysis indicates that the evaluation result gained by using the device we have developed proves to be in conformity to the results gained by using traditional methods and other similar methods.Moreover,the discreteness of the variable weight evaluation result proves to be better than that of constant weight results,which are used to distinguish the quality grades of such geological environments.Therefore,it can be said that the variable weight method here introduced can help to get rid of the defects of such evaluation.What is more,the variable weight method put its focus on punishing worthless values of the indexes and encouraging the positive ones.In addition,the method can also fully reflect the effects of internal different grades of every index on the comprehensive evaluation results of the urban engineering geological environment quality.Thus,it can be concluded that in comparison with the traditional methods,the renovated method significantly can greatly improve the reliability of the quality evaluation grades on the urban engineering geological environment.
【Fund】: 中国地质调查局项目(1212010535501)
【CateGory Index】: P208;P66
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