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Modelling wave attenuation by vegetation with SWAN-VEG : model evaluation and application to the Noordwaard polder

Oude, R. de (2010) Modelling wave attenuation by vegetation with SWAN-VEG : model evaluation and application to the Noordwaard polder.

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Abstract:This study shows SWAN VEG is a suitable tool to quantify the effect of a vegetation field on the wave height. The model shows more, wider, larger or less flexible vegetation results in more dissipation of wave energy. Also larger and longer waves result in a relative larger loss of energy and a larger decrease of the wave height. The model is able to describe experiments with a vegetation parameter ranging from 0.3 to 5 m-1 and for waves with a peak period longer than 2 seconds. The model results verify the vegetation field design in the Noordwaard reduces waves to a height of 0.3 meter which is enough to implement the dike of 4.3 m.+NAP in height. It is recommended to analyse the group velocity in the vegetation field with experiments to verify whether the model gives an appropriate estimation of the group velocity. Also, further verification of the model can be done for vegetation with a vegetation parameter ranging from 5 to 20 m-1. The model can be improved by adding an application to switch off the wind for specified areas. This will limit the wave growth inside the vegetation field
Item Type:Essay (Master)
Clients:
Deltares
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering and Management MSc (60026)
Link to this item:http://purl.utwente.nl/essays/59406
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