摘要
基于水环境系统的不确定性,以及数据信息的不足和不精确性,将沉积物环境背景值和污染物浓度表示为三角模糊数,建立沉积物生态风险的模糊评价模型。应用该模型,取河套地区沉积物为背景值,对乌梁素海沉积物中重金属污染及其生态风险进行分区分析。结果表明,研究区的底质生态环境均受到不同程度的污染,重金属的污染程度依次为Cu>Zn>As>Pb>Cr>Hg>Cd;潜在生态危害程度顺序是Hg>Cd>As>Cu>Pb>Cr>Zn。
According to the characteristics of random and fuzziness,and the shortage and imprecision of datum information of water environmental system,the environment background value of sediments and concentration of pollution was calculated by means of triangle fuzzy number and the fuzzy risk evaluation model of the potential ecological risk index was established.Using this method,the heavy metal pollution and ecological risk in the Wuliangsuhai Lake and its adjacent waters were analyzed.The result showed that the environment of the foundation of the study area was subject to varying degrees of pollution.The pollution extents were correspondingly Cu Zn As Pb Cr Hg Cd.The potential ecological risk to Wuliangsuhai Lake was Hg Cd As Cu Pb CrZn.
出处
《节水灌溉》
北大核心
2011年第3期62-65,共4页
Water Saving Irrigation
基金
国家自然科学基金项目(50969005)
内蒙古自然科学基金重点项目(200711020604)
内蒙古自治区水利厅重点支持项目(20080105)
内蒙古自治区"十一五"科技攻关项目
关键词
沉积物
重金属生态风险评价
三角模糊数
α-截集
乌梁素海
surface sediment
heavy metal ecological risk evaluation
triangular fuzzy number
α-cut
Wuliangsuhai Lake
