向家坝蓄水期金沙江干流水质聚类主成分分析  

Cluster-main composition analysis on water quality in mainstream of Jinsha River during impoundment of Xiangjiaba Dam

作　　者：杨旭光[1] 朱志勋[1] 束金祥[1] 余明星[1] 

机构地区：[1]长江流域水资源保护局长江流域水环境监测中心,湖北武汉430010

出　　处：《人民长江》2014年第18期15-19,共5页Yangtze River

摘　　要：运用聚类分析和主成分分析方法,对向家坝水库蓄水期间金沙江干流6个断面11个水质参数的变化情况进行了分析。分析认为,金沙江干流采样断面可分为两组,即上游断面和中下游断面,其中,上游断面水质参数可概括为4个主成分,中下游断面可概括为5个主成分。此外,结合向家坝库区蓄水情况,分析了上游断面4个主成分随水位的变化规律,结果表明,随着库区水位上升,由于水体中泥沙的沉降作用以及上游来水的稀释作用,各水质参数含量明显降低,蓄水后水质明显优于蓄水前。This paper analyzes the changes of 11 water quality parameters at 6 sections in the mainstream of Jinsha River dur-ing impoundment of Xiangjiaba Reservoir by cluster analysis and main composition analysis. It is considered that the sampling sections can be divided into two groups, namely, upper sections and mid-lower sections;the former has 4 main components for parameters and the latter has 5 main components. The changing rules of 4 main components of the upper sections are analyzed with consideration of the impoundment of Xiangjiaba Reservoir. The result indicates that the content of each water quality parame-ter is obviously lowered and the water quality after impoundment is apparently better than before along with the rising water level of reservoir, because of the effect of sedimentation and the dilution of water from upper reaches.

关 键 词：水质 聚类分析 主成分分析 蓄水期 向家坝库区 

分 类 号：X52[环境科学与工程—环境工程]