AbstractWhen in the period after 1953 the projects to damm up the estuaries in the south western part of the Netherlands took shape and it turned out to be necessary to let very wide discharge sluices into at least one of them, the problem arose which waves had to be taken into account at the structure before, during and after the construction. The waves occurring at high tides and storm surges are determinant for the definite shape and dimensions of the sluices. More frequently occurring waves have to be reckoned with during the construction. Though, especially in recent years, many measurements have been done in nature by the Rijkswaterstaat, supplementary calculations and model investigations appeared necessary, to determine the design criteria at rarely occurring circumstances.
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