Ramadhani, Mochammad Rizki Rozzaqi (2024) Kajian Perubahan Morfologi Pantai & Perencanaan Struktur Alternatif Pengaman Muara Sungai Karanggeneng Akibat Struktur Pemecah Ombak (Breakwater) Pada Pantai Dermaga Tasikagung Rembang, Jawa Tengah. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Perubahan morfologi pantai merupakan rangkaian proses pantai yang diakibatkan proses eksternal (arus, angin, gelombang dan pasang surut), faktor internal (karakteristik dan tipe sedimen serta lapisan dasar dimana sedimen itu berada) (Fahmi & Hafli, 2019). Breakwater umumnya digunakan untuk memecah gelombang agar gempuran gelombang tidak langsung menabrak kearah pesisir yang dapat menyebabkan kerusakan fasilitas maupun terjadinya abrasi. Namun pada bangunan breakwater sisi barat Pantai Dermaga Tasikagung yang tujuan awalnya untuk melindungi Pelabuhan Rembang menimbulkan dampak baru bagi morfologi pantai di wilayah tersebut. Muara sungai di dekat breakwater terancam mengalami pengendapan sedimen akibat arus & sedimen laut yang terbawa dari angin muson barat. Maka akan direncanakan struktur alternatif untuk melindungi muara sungai tersebut dari sedimentasi yang akan terjadi. Dilakukan pemodelan menggunakan software MIKE 21 untuk melihat pola arus dan transport sedimen yang terjadi pada wilayah tersebut. Pemodelan dilakukan pada kondisi eksisting (tanpa struktur alternatif) dan kondisi direncanakannya struktur alternatif. Dari hasil tersebut akan muncul pertimbangan struktur alternatif yang lebih efektif dan ekonomis dari segi fungsi dan struktur. Hasil penelitian yang telah dilakukan, didapatkan bahwa range perubahan ketinggian dasar (bed level change) yakni berkisar antara 0,04 m – 1,12 m dari kedua musim dan total volume dari bed level change yakni sebesar 952966,63 m3. Dari ke-3 kondisi alternatif untuk melindungi muara sungai Karanggeneng, kondisi 3 yang paling efektif dalam mencegah sedimentasi yakni kondisi dimana breakwater eksisting dipindah. Panjang dari breakwater tersebut sepanjang 1,05 km dengan nilai faktor keamanan bangunan dengan nilai 1,3 yang dikategorikan kondisi stabil.
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The morphological changes in the coastline are a series of coastal processes caused by external factors (currents, wind, waves, and tides) and internal factors (characteristics and type of sediment as well as the underlying layer where the sediment is located) (Fahmi & Hafli, 2019). Breakwaters are commonly used to break the waves, preventing direct impact on the coast, which can cause damage to facilities and erosion. However, at the west side breakwater of Dermaga Tasikagung Beach, originally intended to protect the Rembang Port, new impacts on the coastline morphology in that area have arisen. The river mouth near the breakwater is threatened by sediment deposition due to currents and sea sediment carried by the west monsoon winds. Therefore, an alternative structure is being planned to protect the river mouth from the impending sedimentation. Modeling using MIKE 21 software is being conducted to observe the patterns of currents and sediment transport in that area. The modeling is done under existing conditions (without alternative structures) and the anticipated conditions with the alternative structure. The results will lead to considerations for a more effective and economically viable alternative structure in terms of function and design. The research findings indicate that the range of bed level changes varies between 0.04 m and 1.12 m during both seasons, and the total volume of bed level changes is 952966,63 m³. Among the three alternative conditions proposed to protect the Karanggeneng river mouth, the third condition is the most effective in preventing sedimentation, where the existing breakwater is relocated. The breakwater has a length of 1.05 km and a structural safety factor of 1.3, which is categorized as stable
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Sedimentasi, Struktur Alternatif, MIKE 21, Pola Arus, Morfologi Pantai; Sedimentation, Alternative Structures, MIKE 21, Current Patterns, Coastal Morphology. |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC147 Ocean wave power. T Technology > TC Hydraulic engineering. Ocean engineering > TC175.2 Sediment transport T Technology > TC Hydraulic engineering. Ocean engineering > TC203.5 Coastal engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC333 Breakwaters T Technology > TC Hydraulic engineering. Ocean engineering > TC424 Water levels |
| Divisions: | Faculty of Vocational > Civil Infrastructure Engineering (D4) |
| Depositing User: | Mochammad Rizki Rozzaqi Ramadhani |
| Date Deposited: | 19 Aug 2024 06:56 |
| Last Modified: | 19 Aug 2024 06:56 |
| URI: | http://repository.its.ac.id/id/eprint/112943 |
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