Coastline evolution at different time scales - examples from the Pomeranian Bight, southern Baltic Sea.

Schwarzer, K., Diesing, Markus, Larson, M., Niedermeyer, R. O., Schumacher, W. and Furmanczyk, K. (2003) Coastline evolution at different time scales - examples from the Pomeranian Bight, southern Baltic Sea. Marine Geology, 194 (1-2). pp. 79-101. DOI 10.1016/s0025-3227(02)00700-4.

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Abstract

Sedimentological and morphological changes on the upper and lower shoreface during relatively stable sea-level highstand conditions have been investigated in the Pomeranian Bight, southern Baltic Sea, at time scales ranging from storm events to millennia. In order to cover that variety of time scales, different methods have been applied. Seasonal variations in the morphology of the upper shoreface were measured accurately using the tracer stick method. The ratio of breaking waves and energy dissipation due to wave breaking are the main forces controlling redeposition on the upper shoreface with the depth of disturbance up to three times the net change. The impact of single storm events can be observed from sidescan sonar mosaics to remain on the decadal scale. Aerial photographs covering the upper shoreface show that the location of gates, channel-like systems where water masses move offshore created during storm events, also remain stable over decades. Sedimentological and geomorphological variations and changes on the lower shoreface are only measurable on the century to millennium scale because the main driving forces are longlasting processes like sea-level fluctuations or neotectonics. Data on these scales have much more uncertainty in their relationship to forcing functions than data at shorter time scales. Because the effects of coastal processes active on different time scales can interact, comprehensive understanding of large-scale coastal behavior requires investigations from short events to long-term processes. (C) 2002 Elsevier Science B.V. All rights reserved.

Document Type: Article
Keywords: coastal evolution large-scale coastal behavior upper and lower shoreface sandy coastlines Baltic Sea wave climate coastal behavior profile change model terms
Research affiliation: Kiel University
DOI etc.: 10.1016/s0025-3227(02)00700-4
ISSN: 0025-3227
Date Deposited: 24 Jan 2012 05:43
Last Modified: 23 Sep 2019 16:54
URI: http://oceanrep.geomar.de/id/eprint/16217

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