琵琶湖北湖における極小値を伴う溶存酸素鉛直分布の生成機構(河川・湖沼・沿岸環境(1),一般講演)

概要

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It has been an increasing concern that the depletion of dissolved oxygen (DO) concentration at the bottom layer of the northern-part of Lake Biwa with 100m in maximum depth has worsened in recent years not only due to eutrophication in water but also the effects of global warming such as the rise of air temperature during winter. The vertical distribution of DO with a hollow or a minimum value in the thermo-cline between epilimnion and hypolimnion is observed during summer and autumn. Since it is important to clarify the fundamental mechanism of DO transfer to propose countermeasures, this paper deals with the generation mechanism of this typical DO distribution using DO transport equation with production, consumption and diffusion terms.
2010-09-09