九頭竜川水系水質データの統計的解析

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書誌事項

タイトル別名
  • クズリュウガワ スイケイ スイシツ データ ノ トウケイテキ カイセキ
  • Statistical Analysis of the Kuzuryu River Water Quality

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説明

The water quality data of the Kuzuryu River at 11 stations from April 1976 t.o March 1986 were analyzed by correlation analysis method and principal component analysis method. The results were as follows. 1. The negative correlation between water temperature and DO and the positive one between BOD and COD were found. 2. From the principal component analysis based on the correlation matrix of the 7 items (water temperature,pH、DO,BOD、COD、SS and Coliform),the first component (Zl) was identified as the organic water pollution factor. 3. The 4 items (DO、BOD,COD and Coliform) which showed high contribution to the first component were selected for the further analysis. The equation derived from the first component of the principal component analysis with 4 items was used to evaluate Water Quality Index (WQI). WQI displayed less variation than BOD and it could be a more excellent index than common water pollution indicators. 4. By using each principal component and factor loading,11 stations were classified into three groups according to their water qualities.

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