Cyclic Sand Bar Migration on a Spit-platform in the Danish Wadden Sea—Spit-platform Morphology Related to Variations in Water Level

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Abstract

VINTHER, N.; NIELSEN, J., and AAGAARD, T., 2004. Cyclic Sand Bar Migration on a Spit-platform in the Danish Wadden Sea—Spit-platform Morphology Related to Variations in Water Level. Journal of Coastal Research, 20(3), 672-679. West Palm Beach (Florida), ISSN 0749-0208.

Cyclic morphology is related to water levels on a shallow spit-platform in the Danish Wadden Sea. Water levels were used as a dynamic parameter because low water levels, water levels at moderate wind set ups and high water levels occur at different wind situations and they result in different morphology. Low water levels result in a flat sand bar with one deep and narrow ebb channel. Water levels at moderate wind set ups result in several wide and shallow ebb channels. After a storm the spit-platform is flat and low with no dissecting ebb channels. Sand bars on the spitplatform migrate up to 35 m/month. A model proposing the different morphology at the three different water level stages is presented.

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