Alternatif Desain Groin Untuk Pantai Candidasa, Kabupaten Karangasem, Bali

Ardhafad, Ahmad Ivanov Rafly (2026) Alternatif Desain Groin Untuk Pantai Candidasa, Kabupaten Karangasem, Bali. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pantai Candidasa merupakan salah satu kawasan pesisir di Kabupaten Karangasem, Bali, yang mengalami abrasi akibat ketidakseimbangan transport sedimen sepanjang pantai. Upaya penanganan yang telah dilakukan melalui pembangunan sistem groin dan sand nourishment masih memerlukan evaluasi untuk mengetahui efektivitas konfigurasi groin dalam mempertahankan sedimen dan mengendalikan perubahan morfologi pantai. Penelitian ini bertujuan menganalisis pengaruh sistem groin eksisting terhadap morfologi Pantai Candidasa, membandingkan perubahan morfologi pada beberapa alternatif konfigurasi groin, serta menentukan konfigurasi groin yang paling efektif dalam mempertahankan pasir hasil sand nourishment. Penelitian dilakukan menggunakan perangkat lunak MIKE 21 dengan modul Hydrodynamic (HD), Spectral Wave (SW), dan Sand Transport (ST). Simulasi dilakukan pada lima kondisi, yaitu tanpa groin, sistem groin eksisting, Alternatif 1, Alternatif 2, dan Alternatif 3. Analisis dilakukan terhadap perubahan garis pantai menggunakan Digital Shoreline Analysis System (DSAS), Bed Level Change, Bed Level, volume pasir tertahan, dan kecepatan arus. Selanjutnya, konfigurasi terbaik diuji melalui simulasi jangka panjang selama 50 tahun untuk mengevaluasi kestabilan morfologi pantai. Hasil penelitian menunjukkan bahwa sistem groin berpengaruh terhadap perubahan morfologi Pantai Candidasa, dimana setiap konfigurasi menghasilkan respons yang berbeda terhadap distribusi sedimen. Berdasarkan hasil perbandingan, Alternatif 2 memberikan kinerja terbaik dengan rata-rata kemajuan garis pantai sebesar 69,2 m, proporsi akresi sebesar 87% dan abrasi 13%, distribusi perubahan bed level yang lebih merata, volume pasir tertahan terbesar sebesar 198.236,55 m³, serta penurunan kecepatan arus rata-rata menjadi sekitar 0,003 m/s. Hasil simulasi jangka panjang selama 50 tahun menunjukkan bahwa konfigurasi tersebut tetap mampu mempertahankan perkembangan morfologi pantai yang stabil melalui distribusi sedimentasi yang tetap terjaga. Berdasarkan hasil tersebut, dapat disimpulkan bahwa konfigurasi groin pada Alternatif 2 merupakan konfigurasi yang paling efektif dalam mempertahankan pasir hasil sand nourishment dan mengendalikan perubahan morfologi Pantai Candidasa secara berkelanjutan.
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Candidasa Beach is a coastal area in Karangasem Regency, Bali, that is experiencing abrasion due to the collapse of sediment transport along the coast. Mitigation efforts that have been carried out through the construction of groin and sand feeding systems still require evaluation to determine the effectiveness of the groin configuration in retaining sediment and controlling changes in coastal morphology. This study aims to analyze the effect of the existing groin system on the morphology of Candidasa Beach, compare morphological changes in several alternative groin configurations, and determine the most effective groin configuration in retaining sand from sand nutrition. The study was conducted using MIKE 21 software with Hydrodynamic (HD), Spectral Wave (SW), and Sand Transport (ST) modules. Simulations were conducted under five conditions: without groynes, existing groyne system, Alternative 1, Alternative 2, and Alternative 3. Shoreline changes were analyzed using the Digital Shoreline Analysis System (DSAS), Bed Level Change, Bed Level, retained sand volume, and current velocity. Furthermore, the best configuration was tested through a 50-year long-term simulation to evaluate the stability of coastal morphology. The results of the study indicate that the groyne system affects the morphological changes of Candidasa Beach, where each configuration produces a different response to sediment distribution. Based on the comparison results, Alternative 2 provides the best performance with an average shoreline advance of 69.2 m, an accretion proportion of 87% and abrasion of 13%, a more even distribution of bed level changes, the largest retained sand volume of 198,236.55 m³, and a decrease in average current velocity to around 0.003 m/s. The results of a 50-year long-term simulation show that the configuration is still able to maintain stable coastal morphological development through maintained sedimentation distribution. Based on these results, it can be concluded that the groyne configuration in Alternative 2 is the most effective configuration in maintaining sand from sand nourishment and controlling morphological changes in Candidasa Beach in a sustainable manner.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	Pantai Candidasa, groin, sand nourishment, MIKE 21, perubahan morfologi, transport sedimen, Candidasa Beach, groin, sand nourishment, MIKE 21, morphological changes, sediment transport
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC175.2 Sediment transport T Technology > TC Hydraulic engineering. Ocean engineering > TC203.5 Coastal engineering
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Ahmad Ivanov Rafly Ardhafad
Date Deposited:	05 Aug 2026 01:47
Last Modified:	05 Aug 2026 01:47
URI:	http://repository.its.ac.id/id/eprint/143671

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