![]() Before construction of detached breakwaters, the likely future response of the shoreline should be assessed.The design of detached breakwaters should incorporate information about the local wave condition in order to avoid negative effects resulting from their construction.– in Vietnam an erosion control model is being developed that combines mangrove rehabilitation and bamboo wave-breakers, designed according to computer-based wave current and erosion modelling (Schmitt, et al.Breakwater construction in Babuyan in The Philippines is expected to provide protection for 6.3 km of coastline and 200 households living in the coastal areas (Perez et.al., 2013)Ĭonsiderations (technology transfer criteria, challenges, etc.).The effectiveness of detached breakwaters depends on specific design elements such as the crest level above mean sea level, the length of the breakwater relative to the offshore distance, the off shore distance relative to the surf zone width (Cox et al., 2012).Stone breakwaters in Thailand require twice annual maintenance (Jarungrattanapong and Manasboonphempool, 2009) Require ongoing maintenance due to wave damage and erosion of the structure itself.The costs for breakwater construction in Babuyan and Binduyan in the Phillipines is estimated at USD 298,680 with a cost effectiveness ratio of 0.276-0.277M USD per household (Perez et.al., 2013)įuel etc for construction Ease of Maintenance.Construction costs can be reduced by designing detached breakwaters with crest elevation close to the mean sea level (Wamsley et.al., 2002).rubble mounds for conventional breakwaters or local materials such as bamboo and brushwood for locally adapted breakwaters Key design parameters include size of breakwater, gap between breakwaters and their offshore distance, and size and type of construction material. They are often constructed using marine equipment such as barges and floating cranes, but can also be built using trucks and heavy loaders. They mainly reduce erosion, but may also have secondary effects on flood control if they are built to protect dune fields, sea walls and dikes against wave action. Implementationīreakwaters are normally built at exposed and moderately exposed sedimentary coastlines. For example, T-fences connect existing headlands, close eroded gaps in the mangrove forest belt and recreate eroded floodplains (Schmitt, et al. Though typically constructed of materials such as stone, concrete and geotextiles, they can also be created using local materials and structured in different forms. The length of the breakwater, the distance of the breakwater to the shore, the number of single breakwaters in a segmented breakwater and the length of the gaps determine the extent of sedimentation trapping. These are often a pre-requisite for coastal mangrove rehabilitation, beach nourishment and land reclamation. The structures are often porous, which reduces the force of wave energy and traps sand within the coastal zone, both of which reduce the extent of erosion. Coastal breakwaters are a modern and protective adaptation technology. ![]() Wave breaking structures built parallel to the shoreline that are used to reduce erosion and stimulate sedimentation. Their protective functions can be sustained for many years, requiring only basic monitoring and maintenance. ![]() ![]() Well-designed breakwaters can provide stable and robust coastal protection while still maintaining shoreline natural forces. ![]() They are made up of strong material such as rock armour, poured concrete, dolos or tetrapods, and are often constructed in a series to reduce construction costs and protect longer coastal stretches. Breakwaters are generally very solid, durable structures and are considered a hard-engineering protection measure. They thereby protect the coastline behind breakwaters and encourage sediment accumulation in their lees, resulting in beach widening. They are designed to intercept and reduce incoming wave energy at the shoreline.
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