Reworking of former ebb-tidal deltas into large longshore bars following the artificial closure of tidal inlets in the southwest of the Netherlands
Kohsiek, L.H.M. (1988). Reworking of former ebb-tidal deltas into large longshore bars following the artificial closure of tidal inlets in the southwest of the Netherlands, in: de Boer, P.L. et al. (Ed.) Tide-influenced sedimentary environments and facies. Extended versions of papers presented at the Symposium on Classic Tidal Deposits, held August 1985 in Utrecht, Netherlands. pp. 113-122
In: de Boer, P.L. et al. (Ed.) (1988). Tide-influenced sedimentary environments and facies. Extended versions of papers presented at the Symposium on Classic Tidal Deposits, held August 1985 in Utrecht, Netherlands. D. Reidel Publishing: Dordrecht. ISBN 90-277-2622-1. ix, 530 pp., more
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| Abstract |
The estuaries of the Haringvliet and Grevelingen were closed in 1971 and 1972 respectively, to increase the protection of some Dutch coastal provinces against flooding. The tidal currents on the ebb-tidal deltas were reduced by 60%. The ebb-tidal deltas are no longer maintained by the tidal currents, but are reworked by wave action. The morphological consequences of this reworking process in the past decade are that the deeper parts at the edge of the former ebb-tidal deltas are eroded and the sediment is mainly transported upslope, where it becomes incorporated into large longshore bars developing on the former ebb-tidal deltas. This upslope sediment transport is due to the asymmetry of wave orbital motions. The landward migration, as well as the increase in height, of these longshore bars is relatively large for the first few years after closure. In this period variation in migration speed and growth are induced by the relative contribution of storms from the NNW and SW. After about ten years the height of the bars reached the intertidal zone. From then on a relatively strong residual tidal current has been directed seaward and has counterbalanced the landward transport by waves. The morphological development seems to have stabilized. |
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