AN EXPERIMENT AND AN ANALYSIS ON INCLINED PLUME GENERATED BY SALINITY FLUX SUPPLIED FROM A SLOPING BED

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  • 底面からの浮力溶出によって傾斜面上に発生するプルームの実験と解析
  • テイメン カラ ノ フリョク ヨウシュツ ニ ヨッテ ケイシャメン ジョウ ニ ハッセイ スル プルーム ノ ジッケン ト カイセキ

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Abstract

In anaerobic layers of eutrophic lakes and reservoirs, various components of salinity are released from the bed, which produces heavy water mass right above the bed. When the bed is sloping, a plume motion is generated and the heavy water runs down to a deeper region of the lake. The plume transports high amount of dissolved materials to the lake's bottom, which might bring serious contamination of the bottom water with nutrients and ionic matters. The present study is to fundamentally investigate hydrodynamics of this type of plume. In an experimental model, measurements were made with respect to velocity and buoyancy profiles. Flow development along the streamwise direction is examined. Assuming the flow fields having self-similarity profiles of velocity and buoyancy, a theoretical model was developed to analyze the plume's dynamics. The present theory could be applied to estimate how much the plume-oriented transportation is responsible for lake's bottom water contamination.

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