広域沿岸土砂動態評価のための海底境界層モデルの開発  [in Japanese] DEVELOPMENT OF SEA-BOTTOM SUBMARINE BOUNDARY LAYER MODEL FOR WIDE COASTAL AREA AND SAND DYNAMICS EVALUATION  [in Japanese]

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Abstract

汎用型海洋モデルをベースとした懸濁態輸送モデルでは,水深の増加とともに海底付近の鉛直空間解像度が低下し,幅広い水深帯に渡って海底近傍の懸濁物動態を精度良く評価することに課題があった.そこで本研究では,計算座標系(σ座標系等)の最下層に鉛直分布モデルを適用することで,水深変化によらずに海底近傍の懸濁物濃度を正確に評価可能な境界層モデルを構築した.本モデルを単純な非平衡浮遊砂輸送問題や実海域に適用し,通常の差分法では過大評価する底面近傍の底質濃度,濃度フラックスを本モデルが適切に評価することを確認した.

 In the general-purpose ocean model, the vertical spatial resolution near the seafloor decreased with increasing water depth, and there was a problem in evaluating the suspension dynamics near the seabed accurately over a wide water depth zone..Therefore, in this research, we applied a vertical distribution model to the lowest layer of the σ coordinate system to construct a boundary layer model that can appropriately evaluate the concentration of suspended matter near the bottom of the ocean regardless of water depth change. It is confirmed that this model can be applied to simple waterways and real sea areas and that this model appropriately evaluates sediment concentration and concentration flux in the vicinity of the bottom surface to be overestimated by the usual differential method.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), I_463-I_468, 2018

    Japan Society of Civil Engineers

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