DUAL-SIGMA COORDINATE SYSTEM FOR IMPROVEMENT OF COASTAL OCEAN MODEL

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  • 沿岸海水流動数値計算法の高度化のための Dual-σ座標系の提案
  • エンガンカイ ミズリュウドウ スウチ ケイサンホウ ノ コウドカ ノ タメ ノ Dual シグマ ザヒョウケイ ノ テイアン

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Abstract

Sigma coordinate system employed in many coastal ocean models may have considerable errors in computing horizontal diffusion and horizontal pressure gradient in case of steep bottom slopes. In the present study, for more accurate calculation of coastal current and pollutant transport, a dual-sigma coordinate system is presented for a correct calculation of the horizontal diffusion and the horizontal pressure gradient without appreciable increase in computational load. This coordinate system, by introducing a horizontal interfacial plane, separates the flow field into the upper layer, where appreciable vertical variation in density may usually exist, and the lower layer on an uneven seabed; in each of which the sigma coordinate system is employed. This new coordinate system is applied to some simple cases to examine its fundamental validity and performance, demonstrating that the dual-sigma coordinate system may have much higher accuracy than the sigma coordinate system.

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