密度成層流における人工海底マウンドの鉛直混合効果の評価  [in Japanese] EVALUATION OF VERTICAL MIXING DUE TO AN ARTIFICIAL SEAMOUND IN STRATIFIED FLOWS  [in Japanese]

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Abstract

人工海底マウンド(人工湧昇マウンド礁)は,海水の鉛直混合を促進し,生物の一次生産を促す構造物であるが,その定量評価法は確立していない.本研究では,染料と透過光を用いた画像による密度計測手法を開発し,実験水槽内の密度成層中でのマウンド模型曳航による鉛直混合の定量評価を行った.これにより,鉛直混合は二層成層流で密度界面が砕波する場合に大きいこと,また,密度差が小さくとも躍層での混合により密度変化が起こり得ることがわかった.さらに,3次元LES数値計算による結果と比較を行い,実験結果が数値計算により概ね再現でき,今後実海域に則した複雑な条件下での混合効果を定量評価できる可能性があることが分かった.

 An artificial seamound is a structure which induces vertical mixing of seawater and prompts primary production, but its quantitave evaluation method has not been established. In this study, we developed an image analysis method for density measurement by using dye and transmitted light. Vertical mixing induced by a moving mound in stratified still water was evaluated in a water tank. We found that vertical mixing is large in cases that density interface of two-layer flow is broken, and density can change by mixing at pycnocline even if density difference is small. Also we compared the resuls of laboratory experiments with three-dimensional LES numerical simulation. It was found that the numerical simulation can reproduce results of laboratory experiments, and it is expected that the model can evaluate mixing effects under more complicated conditions comforming to real sea states.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(2), I_1201-I_1206, 2016

    Japan Society of Civil Engineers

Codes

  • NII Article ID (NAID)
    130005282235
  • Text Lang
    JPN
  • ISSN
    1884-2399
  • NDL Article ID
    027811913
  • NDL Call No.
    YH267-236
  • Data Source
    NDL  J-STAGE 
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