Author(s): Simone A. H. Van Schijndel; C. Kranenburg

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Abstract: Harbours often suffer from siltation of their basins, which may bring about high costs of maintenance dredging and disposal of spoil, which is contaminated in many cases. Therefore a need exists of methods by which the sediment transport into harbours can be reduced. Of the mechanisms causing such transport, the turbulent exchange of river-water containing suspended sediment and clear water from a river harbour was examined in a physical scale model. The water level was constant and there was no net flow through the entrance of the harbour. A procedure has been developed by which the siltation process can be simulated using slightly heated water. The objective of this study was to devise modifications of the harbour entrance so as to reduce siltation. It was found that a sill in the entrance, a dam narrowing the entrance, and a permeable pile-groyne placed upstream of the entrance all can reduce the exchange substantially. The sill and the dam can be designed such that the exchange is minimized while keeping allowance for navigation. Combining the pile groyne with the sill thus optimized suppressed the exchange for the most part.

DOI: https://doi.org/10.1080/00221689809498604

Year: 1998