Sediment transport and budget of the central coastal zone of Holland
In: Coastal Engineering: An International Journal for Coastal, Harbour and Offshore Engineers. Elsevier: Amsterdam; Lausanne; New York; Oxford; Shannon; Tokyo. ISSN 0378-3839; e-ISSN 1872-7379, meer
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| Trefwoorden |
Behaviour > Migrations
Erosion > Coastal erosion
Sediments
Transport
Marien/Kust |
| Author keywords |
Sediment budget; Shoreline' migration; Longshore; Cross-shore; Depositions |
| Abstract |
Based on the available short-term morphological data (1964–1992), the net yearly-averaged sand volume change in the surfzone (View the MathML source m NAP; to local datum approximately mean sea level) along the coast of Holland was found to be 125,000 View the MathML source (sedimentation), including beach nourishments. A sand budget model has been developed, which describes the sand volume change (in View the MathML source) in each compartment of the coastal area given known gradients of the computed longshore and cross-shore transport rates and known source/sink terms (nourishment, dumping and dredging). The model area extends in cross-shore direction from the +3 m NAP contour to the -20 m NAP contour. The sand budget model has been calibrated (hindcast study) using the yearly-averaged sand volume changes derived from bathymetry data (Jarkus-data base) collected during the period 1964–1992. Input data are the gradients of the yearly-averaged longshore and cross-shore transport rates at the boundaries of the compartments and the available data of beach nourishment, dumping and dredging in the same period. A 2DV-mathematical model representing the hydrodynamic (waves and currents) and sand transport processes in a cross-shore profile was applied to compute the yearly-averaged transport rates in various profiles along the coast at depths of 20 and 8 m and in the surf zone. A detailed sensitivity study was performed to determine the variation ranges of the transport rates. |
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