Author(s): D. M. Sulaiman; B. Yungga; B. A. Wiryawan
Linked Author(s):
Keywords: Coastal erosion; Low-crested breakwaters; Bamboo pile; Salient; Muddy coast
Abstract: Coastal erosion, tidal flooding, and land subsidence on the Northern Coast of Central Java, especially on Timbulsloko, Demak Regency, have resulted in environmental degradation and coastal retreat. In an effort to restore and protect nearly sink coastal area, through the Building with Nature Project, Research Center for Water Resources recommends the application of a Low Crested Breakwaters (hereinafter called as LCB) consists of a bamboo frame and sandbags as a protective and sediment trap structure to promote sedimentation. LCB structures are impermeable structures, selected to obtain affordable, effective and environmental friendly coastal protection structures. The research and development are expected to form the sedimentation behind LCB in the form of salients or tombolos which later can be grown with mangrove. From the results of the numerical model test for simulation of 2 seasons obtained sedimentation behind LCB of 0.30-0.60 m. While in parts of the LCB’s segments, there are some eroded and lose of sediment of 0.13 m, most probably due to tidal current toward the high water, where more sediment transported toward offshore than sediment trapped behind the structures. This paper focuses on the sedimentation processes and hydrodynamics of wave and currents around Timbulsloko coastal waters. This low crested structure is a pilot project that is easily applied by other coastal communities that have similar problems and be a choice among other permeable structures that have been installed by the Ecoshape Consortium.
Year: 2018