大阪市内河川底質汚泥の再浮上と河川水への影響 : 大阪市内河川水質と底質汚泥に関する研究(第3報)

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Resuspension of mud and its influence on river water in Osaka city. FUKUNAGA, I., K. ODA, and G. UNO (Osaka City Institute of Public Health and Environmental Sciences, Tohjocho 21,Tennoji-ku, Osaka 543) Hokkokogaku 57 : 46-49. 1979. In the laboratory the volume of river mud resuspended by water recirculation under anaerobic conditions reached the maximum one minute from the start. As a flow rate of 30 cm/sec, 25 g dry SS/m^2 is resuspended. Under aerobic conditions little river mud was resuspended, even at a flow rate of 30 cm/sec. In the field, the river flow state varies with time, and with bed and water depth of the river. From the difference in the suspended solids concentration between the upper and lower layers of the river the resuspended volume was stimated to be 300 g dry SS/cm^2 at the lower layer flow rate of 70 cm/sec. Measurements of flow rate and suspended solids difference showed that river mud is resuspended only at flow rates of above 40 cm/sec. these results indicate that normal tidal influences can be expected to cause resuspension of mud at the riber mouth in Osaka, but not in the Thames estuary in London.
社団法人日本生物工学会の論文
1979-01-25