北部湾浅海底质污染的聚类分析

CLUSTER ANALYSIS OF SURFACE SEDIMENTS POLLUTION IN THE COASTAL AREAS OF BEIBU BAY

摘要:

利用Q型聚类分析中的夹角余弦法对1984、1985年广西浅海环境调查的43个站位的底质污染物数据资料进行了聚类处理,划分出三大污染类型。其中,I^△类属未污染为主的类型,类型构成比37.2%Ⅱ^△类是以pb污染为主的重金属污染体系,属微污染和轻污染类型,类型构成比32.6%Ⅲ^△类是以Oil、pb污染为主的轻污染和中污染类型,类型构成比占30.2%.分析表明,北部湾浅海区壤由岸到海的方向,污染类型排列是Ⅲ^△、Ⅰ^△、Ⅱ^△,与成因分析相符.聚类结果和《简明规程》法处理结果颇为吻合.

Abstract:

In this paper authors handled the marine environment investigation data about bottom sediment pollution on 43 stations in the coastal areas of Beibu Bay in 1984-1985 by the included angle cosine method of Q type in cluster analysis, sediments pollution classificatioa The bottom sediments are divided into three kinds:the type I belongs in unpolluted or very little pollution, it takes 37.2%. The type Ⅱ^△ is heavy-metal pollution system which takes pb-pollution as main part. It was considered as a light pollution type, taking 32.6%. The type Ⅲ^△ is light-to-medium pollution in which petroleum and several heavy metals(Pb, Hg, Zn, etc) are main pollutants, taking 30.2%.
Analysis shows that the pollution-type order is Ⅲ^△,Ⅰ^△,Ⅱ^△ away from seashore of marine area in Baibu Bay, which tallies with formation cause analysis.