Studi Pengaruh Kedalaman Air terhadap Koefisien Transmisi dan Refleksi Gelombang pada Floating Breakwater Tipe Gergaji Berpori dengan Uji Model Fisik

Mahendra, Wafi Tri (2019) Studi Pengaruh Kedalaman Air terhadap Koefisien Transmisi dan Refleksi Gelombang pada Floating Breakwater Tipe Gergaji Berpori dengan Uji Model Fisik. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Floating breakwater merupakan salah satu jenis dari breakwater yang fungsi utamanya untuk meredam energi gelombang sebelum mencapai bibir pantai supaya tidak terjadi abrasi. Perkembangan floating breakwater sendiri semakin meningkat secara signifikan, karena penerapannya lebih efektif, fleksibel dan efisien dibanding fixed breakwater. Floating breakwater sangat cocok diterapkan pada kondisi laut yang gelombangnya relatif kecil, kondisi tanah yang kurang baik dan kedalaman laut yang cukup dalam. Pada penelitian Tugas Akhir ini akan dilakukan uji fisik floating breakwater tipe gergaji berpori dengan variasi kedalaman air yaitu pada kedalaman 35 cm, 40 cm dan 45 cm. Hasil pengolahan data dari uji fisik tersebut berupa nilai koefisien transmisi (Kt) dan refleksi (Kr) gelombang yang selanjutnya akan dibandingkan dengan hasil uji fisik floating breakwater tipe pontoon. Berdasarkan hasil analisis setelah dilakukannya pengujian dengan variasi kedalaman air, semakin dalam kedalaman air maka nilai Kt floating breakwater tipe gergaji berpori semaki kecil. Dimana pada kedalaman 45 cm rata-rata Kt lebih kecil 3.43 % dari kedalaman 35 cm dan 2.2 % dari kedalaman 40 cm .Untuk rata-rata Kr tipe gergaji berpori pada kedalaman 45 cm lebih besar 11.4 % dari kedalaman 35 cm dan 5.4 % dari kedalaman 40 cm. Setelah dibandingkan dengan tipe pontoon nilai Kt tipe gergaji berpori lebih besar 6.12%, 5.61%, dan 5.39%, sementara untuk nilai Kr lebih kecil 14.74%, 12.59%, dan 9.79% terhadap tipe pontoon pada kedalaman air 35 cm, 40 cm, dan 45 cm secara berurutan.
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A floating breakwater is a type of coastal protection structure designed to reduce wave energy before it reaches the shoreline, thereby minimizing coastal erosion. In recent years, floating breakwaters have gained increasing attention because they offer greater flexibility, efficiency, and cost-effectiveness than conventional fixed breakwaters, particularly in areas with relatively small wave heights, poor seabed conditions, and deep water. This study investigates the hydraulic performance of a porous saw-type floating breakwater through physical model testing under three water depths: 35 cm, 40 cm, and 45 cm. The experimental results were analyzed in terms of wave transmission coefficient ((K_t)) and wave reflection coefficient ((K_r)), and subsequently compared with those of a conventional pontoon-type floating breakwater. The results indicate that increasing water depth reduces the wave transmission coefficient of the porous saw-type breakwater. At a water depth of 45 cm, the average (K_t) value was 3.43% lower than that at a depth of 35 cm and 2.20% lower than that at a depth of 40 cm. Conversely, the average wave reflection coefficient ((K_r)) at a depth of 45 cm was 11.4% higher than that at 35 cm and 5.4% higher than that at 40 cm. When compared with the pontoon-type breakwater, the porous saw-type exhibited average (K_t) values that were 6.12%, 5.61%, and 5.39% higher at water depths of 35 cm, 40 cm, and 45 cm, respectively. However, its average (K_r) values were 14.74%, 12.59%, and 9.79% lower than those of the pontoon-type breakwater at the corresponding water depths. These findings provide valuable insights into the hydraulic performance of porous saw-type floating breakwaters for coastal protection applications.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	breakwater, floating breakwater, fixed breakwater, koefisien transmisi, koefisien refleksi
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC363 Floating harbors. Including floating docks, piers, etc
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Wafi Tri Mahendra
Date Deposited:	26 May 2026 04:35
Last Modified:	23 Jul 2026 07:22
URI:	http://repository.its.ac.id/id/eprint/68576

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