Water quality change studies of upstream areas with leisure facility

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  • Makino Ikuyo
    Environment Conservation Research Center, Tohoku University
  • Yahagi Yuji
    Graduate School of Engineering, Shibaura Institute of Technology

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Other Title
  • レジャー利用のある山岳森林河川に共通する水質変化の検討
  • レジャー リヨウ ノ アル サンガク シンリン カセン ニ キョウツウ スル スイシツ ヘンカ ノ ケントウ

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Abstract

 We conducted water quality testing on multiple river basins, located in the mountain and forest areas which had leisure facilities, such as fishing ponds and camping sites brought about by the leisure boom of recent years. Based on the data on water quality of these tests, we carried out the water quality analysis, using the method of multivariate statistics whose standardized data were simple. Extracting the parameter of the changes in the water quality by the principle component analysis, we carried out the water quality classification. The results indicated that for two out of the three rivers tested, we were able to classify them into forest streams whose water quality was good and water zones which had been impacted by leisure facilities. However, regarding the one remaining river, we were unable to extract the parameter of the changes in water quality, being that no specific tendencies were detectable in the water quality. In the principle component analysis based on the data of water quality, the cumulative contribution ratio was as high as 86% with up to three principle components. In spite of this result, we were unable to extract the parameter of the changes in water quality. We believe that the reason for that was the fact that this river had been impacted by the quality of geology and of the ground water in such an intensive way that no difference was detectable in the water quality,irrespective of whether it was upstream or downstream, or whether it was natural or man-made water zones.

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