STABILITY OF BRACKISH ENVIRONMENT AND IMPACT ASSESSMENT TO HYDRAULIC CONDITION IN LAGOON AT COAST OF THE SEA OF OKHOTSK

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  • オホーツク沿岸潟湖における汽水環境の維持機構と水理条件への応答特性

Abstract

<p> Using a conceptual model with salt as a constraint, being considered to be important for the spawning of brackishwater clams, as well as suspended substances and iron, various conditions in Mokoto Lake and Shibunotsunai Lake that differ in the state of reproduction of brackishwater clams, the magnitude of the contribution of the physicochemical process was examined. In the model, the retention of inflowing river water in the lagoon, sedimentation/resuspension, elution of iron, and biological uptake were considered. Since the inflow of sediment in Mokoto Lake due to a large basin and broad farmland, the contribution of sedimentation and resuspension is considered to be relatively large. As a result of sensitivity analysis, Shibunotsunai Lake has a large impact on water quality due to changes in flow rate and residence time, and is vulnerable to river improvement and changes in lake topography.</p>

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