Evolution of alongshore bathymetric variability around a mega-scale beach nourishment

Conference paper (2017)

Authors

M. Radermacher WaveDroid, Coastal Engineering - CEG
Wessel Geerlof Student
M.A. de Schipper Shore Monitoring & Research, Coastal Engineering - CEG
B.J.A. Huisman Coastal Engineering - CEG , Deltares
S.G.J. Aarninkhof Coastal Engineering - CEG
A.J.H.M. Reniers Environmental Fluid Mechanics - CEG
Research Group
Coastal Engineering (CEG) (TU Delft)
Copyright: © 2017 M. Radermacher, Wessel Geerlof, M.A. de Schipper, B.J.A. Huisman, S.G.J. Aarninkhof, A.J.H.M. Reniers
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Published Date

2017

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Coastal Engineering

Abstract

The presence of complex nearshore sand bar patterns (i.e. alongshore bathymetric variability) has an impact on local currents, affecting recreational safety and nearshore mixing processes. This study assesses the evolution of alongshore bathymetric variability along the Delfland coast in The Netherlands, over the first 5 years after construction of a mega-scale beach nourishment (the Sand Motor) in the central part of the coastal cell. A total of 38 bathymetric surveys was conducted over this period. Alongshore variability was quantified by subtracting an alongshore averaged bathymetry from the actual surveyed bed levels for both the intertidal and subtidal zone. From 2 years after construction onwards, the subtidal nearshore bathymetry at the Sand Motor is considerably more alongshore variable than the adjacent parts of the Delfland coast. Intertidal variability tends to be high in areas where beach groynes are present.