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Sedimentological implications of morphodynamic changes in the ebb-tidal delta, the inlet and the drainage basin of the Zoutkamperlaag tidal inlet (Dutch Wadden Sea), induced by a sudden decrease in the tidal prism Oost, A.P. (1995). Sedimentological implications of morphodynamic changes in the ebb-tidal delta, the inlet and the drainage basin of the Zoutkamperlaag tidal inlet (Dutch Wadden Sea), induced by a sudden decrease in the tidal prism, in: Flemming, B.W. et al. (Ed.) Tidal Signatures in Modern and Ancient Sediments. Special Publication of the International Association of Sedimentologists, 24: pp. 101-119 In: Flemming, B.W.; Bartholomä, A. (Ed.) (1995). Tidal Signatures in Modern and Ancient Sediments. Special Publication of the International Association of Sedimentologists, 24. Blackwell Science: Oxford. ISBN 0-86542-978-2. 358 pp., meer In: Special Publication of the International Association of Sedimentologists. Blackwell: Oxford. ISSN 0141-3600; e-ISSN 2054-6610, meer

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Beschikbaar in	Auteur
VLIZ: Non-open access 284089 [ aanvragen ]

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Trefwoord

Marien/Kust

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Auteur		Top
Oost, A.P.

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Abstract

In 1969 the Lauwerszee, an embayment or the Wadden Sea, was diked and the tidal volume of the Zoutkamperlaag tidal inlet decreased from 305 * 106 ml to 200 * I06 ml. The sudden decrease in tidal prism caused significant sedimentary changes. In order to document and investigate these changes, high-resolution computer studies were conducted and sedimentary cores were analysed. Reduction of the tidal prism led to strong erosion of the ebb-tidal delta, a down drift shift and partial fill of the inlet gorge, the formation of a large bar in the ebb-tidal delta, the partial fill of the main backbarrier channel, a shift of the eastern watershed and channel fill east or that watershed. The abandoned channel fills in particular have a significant preservation potential. Such fills reflect the sudden decrease in tidal prism and consists of clays, sands or alternations of both, deposited under relatively quiet conditions. The alternations reflect seasonal depositional cycles. Sudden reductions of tidal prisms also occur under natural conditions, both in tectonically active and inactive lagoonal/estuarine settings. Apart from tectonics, several other factors can lead to a reduction of tidal prism and to the formation of abandoned channel fills. Several cases of abandoned channel fills from the fossil record can thus be explained in terms of local reduction of tidal prisms.

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