Sediment transport in the nearshore area of Egmond-aan-Zee (NL)
Van Lancker, V.R.M.; Lanckneus, J.; Martens, C.; Moerkerke, G. (2001). Sediment transport in the nearshore area of Egmond-aan-Zee (NL), in: Hanson, H. et al. (Ed.) Coastal Dynamics '01: Proceedings of the Fourth Conference on Coastal Dynamics, June 11-15, 2001, Lund, Sweden. pp. 520-529. https://dx.doi.org/10.1061/40566(260)53 In: Hanson, H.; Larson, M. (Ed.) (2001). Coastal Dynamics '01: Proceedings of the Fourth Conference on Coastal Dynamics, June 11-15, 2001, Lund, Sweden. ASCE: Reston. ISBN 0-7844-0566-2. 1086 pp., more |
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| Abstract | In the framework of the MASTII COAST3D project, the nearshore multiple bar system of Egmond-aan-Zee (NL) was morphologically and sedimentologically investigated on the basis of very-high resolution digital side-scan sonar imagery and intensive samplings. An analysis of the smallscale morphology revealed a number of bedforms and could be interpreted in terms of the variations in current velocities. Although, the area is generally devoid of bedforms some regions occur where complex multi-scaled ripple patterns occur such as lunate megaripples along the seaward flank of the outer bar and in the throat of a rip channel. In the trough between the outer and inner bar, cross-shore oriented symmetrical ripples can be distinguished showing sharp delineations with zones of no bedforms. A clear relation exists between the spatial distribution of the surficial sediments and the morphology. The area is characterised by medium, well-sorted sands except for the trough between the inner and outer bar where mainly coarse moderately sorted sand is found. Fine sands are sporadically present, as well in the trough as along the seaward flank of the outer bar. A sediment trend analysis (STA) was performed to calculate residual transport directions on the basis of the areal distribution of some sediment parameters and the results were correlated with the results of the COAST3D modelling group. Confirmed by the modelling results, the STA approach shows a dominant residual tidal current in a northeastern direction; offshore directed flows in the rip channel and a wave-induced longshore current in a southwards direction. |
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