A THREE-DIMENSIONAL NUMERICAL ANALYSIS ON SEDIMENT DEPOSITION TREND AND EFFECTIVE DREDGING AREA IN PORT

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  • 港湾内の土砂堆積傾向に及ぼす浚渫範囲の影響に関する3次元数値解析

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  In a port located near a river mouth, sediment deposition can affect operations of a berth. In dredging the accumulated sediment, it is essential to determine an effective dredging area for reducing the total cost of maintaining the berth. In this study, numerical simulations are carried out using a two-way coupled fluid-sediment interaction model to determine an effective dredging area near a berth of Nagoya Port, Japan. For validation, the model is applied to the current seabed topography. It is found that the model predicts reasonably well seabed profile change measured in field surveys. To determine the most effective dredging area, the model is applied to seabed topographies with several patterns of dredging area. The results show that sediment deposition in the dredging area depends on the size and surrounding slope of the dredging area, and suggest that it is necessary to assess flow fields and resulting seabed profile evolution in determining the most effective dredging area.

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