Design parameters for coastal dikes |
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Authors: | Layla Loffredo Dirk Schulz Jort Wilkens |
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Institution: | (1) Research and Technology Centre Westcoast, University of Kiel, Kiel, Germany;(2) Present address: Hydraulics Laboratory, K.U. Leuven, Kasteelpark Arenberg 40, Postbus 2448, Heverlee, 3001, Belgium;(3) Estuaries and Dredging, HR Wallingford, UK |
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Abstract: | This paper presents results of the assessment of the design parameters leading to the definition of the crest level of a coastal
dike along the German North Sea. Procedures to estimate the design water level have been proposed, distinguishing between
comparative and single value procedures. The transformation of the wave characteristics from deep water towards the shallow
foreshore was achieved through the application of a spectral wave model. To improve the wave parameter estimations, the existing
model was nested to a grid with a higher resolution closer to the coast. The estimation of the wave run-up followed the Dutch
procedure with some adjustments to the local wave characteristics and dike geometry. The computed maximum crest level of 8.4 m
is below the crest height of the existing dike, which is 8.8 m. However a proposal for a more economical design should be
carefully evaluated, paying attention to the uncertainties encountered in this research. The general recommendation is to
enhance the reliability of the hindcasted wave parameters through calibration and validation of the wave model and to include
in the design process an investigation of the effect of the medium term morphological developments. |
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Keywords: | Coastal dikes Wave modelling Wave transformation Design water level Wave run-up |
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