基于指标模糊权和协调性下的地下水水质评价模型构建及应用  

MODEL FOR EVALUATION OF GROUNDWATER QUALITY BASED ON COORDINATION AND FUZZY WEIGHT AMONG INDICATORS

作　　者：于会彬[1,2] 栗越妍[2] 席北斗[2] 郭旭晶[1,2] 何连生[2] 苏婧[1,2] 许其功[2] 

机构地区：[1]北京师范大学环境学院,北京100875 [2]中国环境科学研究院,北京100012

出　　处：《环境工程》2009年第4期120-123,共4页Environmental Engineering

基　　金：国家重点基础研究发展计划(973)项目(2005CB724203)

摘　　要：在地下水质量标准中,各指标权重的选择与权重的内涵存在着不确定性;同一指标的分级界点值差异显著,近似地呈现几何级数变化。基于以上这两种情况,构建基于指标模糊权和协调性下的地下水水质评价模型。应用层次分析法和专家调查9标度法确定指标的相对权重,结合贝塔系数计算出指标的模糊权重。对评价标准及待评价地下水水质监测值进行对数变换,采用距离测度法来构造隶属函数,并对其进行求余,按最大隶属原则来评判地下水质量等级。应用此模型对徐州市的重要水源地——张集地下水水质进行评价。结果表明:研究区的20个采样点水质为Ⅱ、Ⅲ级的占90%,符合饮用水的要求。与投影寻踪法的评价结果基本一致。There were great differences among the boundary data of the same indicator in quality standard for groundwater, and values of boundary data increased nearly in geometric progression. In addition, uncertainty emerged in weights＇ selection and meaning of indicators, Based on the above consideration, a model was established for evaluation of groundwater quality. Logarithmic transformations were taken on both the boundary data of the standard and the monitoring data of the sites to be evaluated, which improved the coordination among the indicators. Relative weights could be calculated in application to AHP and 9-scale in experts＇ investigation, and fuzzy weights were figured in integration of Beta coefficient. The subordinate function was established through the method of distance measure, and the function would be calculated its reminder. Finally the ranks of groundwater quality were evaluated according to the maximum subordination. The model was applied to evaluate groundwater quality of a well field in Zhangji of Xuzhou and the results showed that 90 % of the water samples in the well field can be rated as either level Ⅱ or Ⅲ according to the water quality standard. Most of the groundwater samples are of good quality and fit the quality standard of potable water, which are basically agreed with those of the projection pursuit model.

关 键 词：地下水 模糊权 协调性 对数变换 距离测度 

分 类 号：X824[环境科学与工程—环境工程] O159[理学—数学]