Design Considerations for Brushwood Fences Concerning Bathymetry and Fence Locations
Tung Dào (Hanoi University of Natural Resources and Environment, Hanoi, TU Delft - Coastal Engineering)
B. Hofland (TU Delft - Hydraulic Structures and Flood Risk)
Marcel Stive (TU Delft - Coastal Engineering)
Tri Mai (Hanoi University of Civil Engineering)
Anh Ngo (Thuyloi University)
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Abstract
Wooden fences are nature-based supporting structures to restore mangroves in the Mekong Delta. The hydraulic functioning of wooden fences was studied in previous studies. However, the role of bathymetry in the dissipation and damping of waves by wooden fences has not been studied yet. Thus, in this study, a numerical approach is used to find the effect of the position of fences and the foreshore bathymetry, including two particular slopes of 1/200 and 1/500, on wave damping due to wooden fences. The results show that the bottom slope significantly influences the dissipation of incoming waves, the so-called pre-dissipation, before damping by the wooden fences. Differences in pre-dissipation occur between fence locations along the cross-shore slopes. The higher pre-dissipation takes place for wooden fences closer to the land, as the depth-limited wave height at the fence reduces. The efficiency in wave damping of wooden fences is also increasing as the freeboard is becoming larger for the fence located closer landward.