AbstractPebuahan Beach in Jembrana Regency, Bali has experienced severe beach erosion since the construction of the Nusantara Pengambengan fishing port, 10 km east of Pebuahan. Efforts to countermeasure the coastal problem has been carried out by many local residents, but failed due to strong longshore drift. Through a collaboration between the Research Center for Water Resources, the Bali Penida River Basin, and PT. Geotechnical Systemindo, the implementation of low-crested breakwaters (LCB) or PEGAR, made of Woven Geotextile Tubes was initiated. Four woven geotextile tubes C12.9 m with length varied from 20 m to 25 m were installed to form LCB with the length of 60 m, at distance to the coast of 50 m. The monitoring of shoreline changes was conducted over the 3 months after its installation, which shows the formation of a new shoreline with the amount of deposited sand of 185.8 m3. The breaking wave on LCB crest results in successfully controlling the longshore current, hence the longshore drift settles behind the LCB to form a new coastline. It is expected this field study can be treated as an additional input to improve LCB Guideline and to expand LCB effectiveness scope not only apply to shallow wave conditions and beaches such as on North coast of Java, but also can be applied more universally to a deeper coastal waters with high wave conditions.
Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/AFzvkvYY2Do
Bali-Penida River Basin, 2015. Studi Kelayakan Pembangunan Breakwater Pantai di Kab. Gianyar, Kab. Jembrana, dan Kab. Buleleng, Laporan Akir, Denpasar. 143 pp.
Bali Penida River Basin, 2019. Drone photographs of Pebuahan beach in January and August Monitoring. Laporan Dokumentasi. Denpasar.
Black, K.P. and Andrews, C.J., 2001. Sandy shoreline response to offshore obstacles, Part 1: Salient and tombolo geometry and shape. In: Black, K. P. (ed.), Natural and Artificial Reefs for Surfing and Coastal Protection. Journal of Coastal Research, Special Issue No. 29, pp. 82-93.
Buccino, M., dan Calabrese, M., 2007. Conceptual Approach for Prediction of Wave Transmission at Low Crested Breakwaters. Journal of Waterway, Port, Coastal, and Ocean Engineering.ASCE, pp. 213-224. Vol.133(3). Reston. Virginia.
Burcharth, H.F., Hawkins, S.J., Zanuttigh, B. and Lamberti, A., 2007. Environmental Design Guidelines for Low Crested Structures. pp. 213-231.Elsevier, Amsterdam.The Netherland.
Coastal Engineering Laboratory.2018. Installation of LCB Geotekstil Woven at Pebuahan Beach, Jembrana Bali. In: Istallation Report of LCB Geotekstil Woven.Buleleng. pp. 1–27.
Coastal Engineering Laboratory. 2019. Monitoring Perubahan Garis Pantai Pebuahan Pasca Pemasangan LCB Geotekstil Woven. Jembrana: Laporan Monitoring. Buleleng. pp1–31.
Mead. S.T. 2009. Wave Rotation for Coastal Protection. Reef Journal. Vol.1 (1). Raglan. New Zealand. pp.301-311.
Pascual CV, Mera FL, Rodriguez IL. 2007. Breakwaters Stability Analysis of Low Crested and Submerged Rubble Breakwaters: Relationship between Flow Characteristic. In: Proceedings of the 5th International Conference on Coastal Structures 2007. Venice-Italy. pp. 939–50.
Research Center for Water Resources, 2017 . Planning and Construction Manual of PEGAR Using Geotextile Tubes., Concensius Meeting, Bandung. 48 pp.
Sulaiman, Dede M., 2017. Segmented Low-Crested Breakwaters.. Deepublish, Yogyakarta. Ed-1, pp.28-72.
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