We researched the Ishikari river, Japan's second-longest river, to clarify the characteristics of non-point pollution by comparing flux characteristics of chemical components in three periods of one year: the snow melting period, the typhoon flooding period and the stable period. We found non-point pollutants present in great amounts because a large amount of suspended matter, which is contained in soil, flows into the river and concentrations of nutrients and organic matters do not decrease in a short time in the flooding period by rain and in the snow melting period.
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Research Article| October 01 2001
Non-point pollution of Ishikari River, Hokkaido, Japan
Water Sci Technol (2001) 44 (7): 1–8.
H. Tachibana, K. Yamamoto, K. Yoshizawa, Y. Magara; Non-point pollution of Ishikari River, Hokkaido, Japan. Water Sci Technol 1 October 2001; 44 (7): 1–8. doi: https://doi.org/10.2166/wst.2001.0376
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