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