title: Non-point pollution of Ishikari river, Hokkaido, Japan.
abstract: 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.
authors.affiliation: Graduate School of Engineering, Hokkaido University, Sapporo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tachibana
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
authors.forename: K
authors.initials: K
authors.lastname: Yoshizawa
authors.forename: Y
authors.initials: Y
authors.lastname: Magara
mesh_terms: D004190:Disasters; D004784:Environmental Monitoring; D007564:Japan; D011891:Rain; D012621:Seasons; D012914:Snow; D012989:Soil Pollutants; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D012989:Soil Pollutants; D014873:Water Pollutants