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1 May 2005 Sediment Properties in the Western Baltic Sea for Use in Sediment Transport Modelling
Bernd Bobertz, Christiane Kuhrts, Jan Harff, Wolfgang Fennel, Torsten Seifert, Björn Bohling
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Abstract

To simulate transport of clastic material in the Baltic a sediment transport module is linked to a Baltic Sea Model that is based on the Modular Ocean Model—MOM3. In order to describe the properties of the seabed sediment parameters as mean grain size, critical shear velocity and bed roughness length must be provided as input data to the numerical model system. To obtain maps of these quantities for the Baltic Sea area the proxy-target concept is applied. As proxy-variable the mean grain size of the sediment types is used. For different sediment samples the critical shear velocity was measured and serves as the target variable. Using the relation between the sediment classifications based on the mean grain size (proxy) and the measured critical shear velocity (target) a map of the critical shear velocity in the Baltic is derived.

In January 1993 several extreme strong storm events occurred in the Baltic. Using this period for a model calculation maximum values of current and wave induced bottom shear velocities were obtained. Comparing these model results with the critical shear velocity distribution provided by the proxy-target concept we identify potential erosion areas. Further we show the transport path of material initially deposited in the Mecklenburgian Bight.

Bernd Bobertz, Christiane Kuhrts, Jan Harff, Wolfgang Fennel, Torsten Seifert, and Björn Bohling "Sediment Properties in the Western Baltic Sea for Use in Sediment Transport Modelling," Journal of Coastal Research 2005(213), 588-597, (1 May 2005). https://doi.org/10.2112/04-705A.1
Received: 29 April 2004; Accepted: 29 April 2004; Published: 1 May 2005
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KEYWORDS
numerical model
proxy-target
risk of erosion
sediment map
sedimentology
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