Studi Pemodelan Layout Breakwater untuk Meminimalisir Laju Sedimen di Pantai Candidasa, Kabupaten Karangasem, Bali

Muchrivayunianto, Nauval Dwi (2026) Studi Pemodelan Layout Breakwater untuk Meminimalisir Laju Sedimen di Pantai Candidasa, Kabupaten Karangasem, Bali. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kawasan Pantai Candidasa di Kabupaten Karangasem, Bali, mengalami permasalahan abrasi serius sejak tahun 1970 akibat ketidakseimbangan transpor sedimen yang dipengaruhi oleh hidro-oseanografi dan pembangunan pesisir. Sebagai alternatif perlindungan pantai terintegrasi selain konstruksi eksisting, penelitian ini mengkaji penerapan struktur offshore breakwater menggunakan pemodelan numerik Delft3D. Proyek akhir ini bertujuan untuk menganalisis kondisi eksisting, menguji efektivitas variasi layout breakwater dalam mereduksi energi gelombang dan meminimalisir laju transpor sedimen, serta menentukan konfigurasi tata letak yang optimal dan paling ekonomis untuk periode proyeksi selama 50 tahun. Pemodelan dilakukan dengan membandingkan kondisi eksisting terhadap tiga skenario alternatif layout. Hasil simulasi menunjukkan bahwa pada kondisi eksisting, pergerakan dasar laut sangat dinamis dengan ketebalan sedimen rata-rata 0,0325 meter dan kecepatan arus berkisar 0,023 m/s hingga 0,061 m/s. Melalui penerapan variasi struktur, Alternatif layout 3 (panjang 160 m, elevasi +3,80 m, perletakan sebelum garis gelombang pecah, dan jarak antar bangunan 60 m) terbukti menjadi konfigurasi yang cukup efektif. Skenario layout 3 menghasilkan kondisi perairan di belakang struktur yang paling tenang dengan kecepatan arus mereduksi hingga kisaran 0,000 m/s – 0,023 m/s. Penurunan energi arus ini mengoptimalkan proses pengendapan (settling) material, sehingga menghasilkan akumulasi sedimentasi/akresi tertinggi dengan rata-rata ketebalan mencapai 0,2847 meter. Selain hasil hidrodinamika yang optimal, layout 3 juga menjadi opsi paling ekonomis karena hanya membutuhkan 22 unit bangunan breakwater dibandingkan dengan layout lain yang memerlukan hingga 26 unit.
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The Candidasa coastal area in Karangasem Regency, Bali, has experienced serious coastal erosion since 1970 due to an imbalance in sediment transport influenced by hydro-oceanographic conditions and coastal development. As an alternative to existing coastal protection measures, this study examines the application of offshore breakwater structures using Delft3D numerical modeling. This final project aims to analyze the existing conditions, test the effectiveness of various breakwater layouts in reducing wave energy and minimizing sediment transport rates, and determine the optimal and most economical layout configuration for a 50-year projection period. Modeling was conducted by comparing the existing conditions with three alternative layout scenarios. The simulation results show that, under existing conditions, seabed movement is highly dynamic, with an average sediment thickness of 0,0325 meters and current speeds ranging from 0,023 m/s to 0,061 m/s. Through the application of structural variations, Layout Alternative 3 (160 m long, elevation +3,80 m, located before the breaking wave line, and a distance of 60 m between structures) proved to be a fairly effective configuration. Layout Scenario 3 produces the calmest water conditions behind the structure, with current velocities reduced to a range of 0.000 m/s – 0.023 m/s. This reduction in current energy optimizes the sediment settling process, resulting in the highest sedimentation/accretion accumulation with an average thickness of 0.2847 meters. In addition to providing optimal hydrodynamic performance, Layout 3 is also the most economical option because it requires only 22 breakwater structures, compared to other layouts that require up to 26.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Abrasi Pantai, Offshore Breakwater, Transpor Sedimen, Pemodelan Numerik, Delft3D, Coastal Erosion, Offshore Breakwater, Sediment Transport, Numerical Modeling, Delft3D
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures T Technology > TC Hydraulic engineering. Ocean engineering > TC175.2 Sediment transport T Technology > TC Hydraulic engineering. Ocean engineering > TC333 Breakwaters
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Nauval Dwi Muchrivayunianto
Date Deposited:	04 Aug 2026 07:27
Last Modified:	04 Aug 2026 07:27
URI:	http://repository.its.ac.id/id/eprint/143252

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