都市河川の自浄作用に及ぼす水温の影響

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The influence of water temperature on the self-purification of rivers has already been investigated in the laboratory.In this study, we investigated the self-purification by taking into consideration the relationships between the BOD_5 of river water and its temperature in the field. The temperature coefficient θ was obtained from the equation : L=L_<(20)>(1/θ)^<(γ-20)>where, L and L<(20)> are the BOD_5 load (ton/day) or BOD_5 concentration (ppm) at observation points where the water temperature is T℃ and 20℃, respectively.The average temperature coefficient θ of the rivers in Osaka City and the River Yodo was found to be 1.023 and 1.028 respectively, which was a little smaller than the average values obtained in the laboratory.By substituting into the above equation the annual variation characteristics of river water temperature which we reported previously, the BOD_5 annual variation of river water was estimated. Examples are given.
社団法人日本生物工学会の論文
1980-01-25