Perencanaan Bangunan Pengaman Muara Kali Gebangsawit Kec. Balongan, Indramayu Jawa Barat

Fauziyyah, Raidatul (2022) Perencanaan Bangunan Pengaman Muara Kali Gebangsawit Kec. Balongan, Indramayu Jawa Barat. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Muara Kali Gebangsawit yang terletak di Desa Majakerta, Kecamatan Balongan, Kabupaten Indramayu Namun kondisi dari Muara Kali Gebangsawit berpotensi mengalami pendangkalan pada alur perputaran kapal besar yang akan singgah yang didominasi oleh gelombang dengan angkutan sedimen sejajar pantai yang bergerak ke utara yang diindikasikan oleh pembelokan mulut kali sama dengan arah angkutan sedimen sejajar pantai. Dimana hal tersebut tentunya akan menghambat proses industri pada jetty yang melibatkan kapal kapal besar. Dengan kondisi tersebut, untuk mencegah dan meminimalisir hal tersebut maka perlu dibangun bangunan pelindung muara yang baru mengingat keberadaan jetty merupakan komponen penting yang berdampak pada proses industri pada wilayah tersebut. Bangunan yang direncanakan berupa groin dengan fungsi untuk melindungi muara kali dari gerusan air dan mencegah sedimentasi memasuki muara sungai yang akan menyebabkan pendangkalan pada daerah perputaran kapal. Bangunan yang akan dibuat berupa groin dan saat merencanakan bangunan tersebut perlu memperhatikan kondisi lapangan yang merupakan daerah berlumpur dan rawan terhadap endapan lumpur. Perencanaan bangunan meliputi peramalan gelombang, perhitungan gelombang periode ulang, pemodelan gelombang, perencanaan struktur. Analisis gelombang meliputi peramalan gelombang 50 tahun dengan menggunakan metode Short Protect Manual 1984 dan gelombang periode ulang 50 tahun menggunakan distribusi Weibull. Kemudian, hasilnya akan dimodelkan di software Delft 3D. dari permodelan tersebut bisa diketauhi tinggi gelombang rencananya. Kemudian dihitung elevasi struktur terhadap kondisi gelombang existing, storm surge, run-up, wave set-up, dan kenaikan muka air laut dikarenakan pemanasan global. Hasil peramalan gelombang dan periode ulang 50 tahun menghasilkan gelombang laut dalam Hs = 2.319 m.Transformasi gelombang menggunakan Delft3D menghasilkan gelombang di depan struktur Hs = 1.67 m. sehingga didesainlah struktur groin dengan elevasi puncak +5.51 m MSL dengan tiga lapis pelindung yang terbuat dari bahan batu pecah. Lapisan pertama adalah lapisan lindung, berat butiran lapisan lindung utama sebesar 0.6 ton untuk bagian lengan dan 1.6 ton untuk bagian kepala. Lebar puncak dan tebal lindung utama sebesar 1.5 m untuk bagian lengan dan 2 m untuk bagian kepala. Lapisan kedua bisa disebut dengan lapisan bawah pertama, berat butir untuk lapisan bawah pertama dengan rentang sebesar 0.06 ton – 0.03 ton di bagian lengan dan 0.16 ton – 0.08ton dibagian kepala. Lebar puncak di bagian kepala dan lengan menyesuaikan kondisi di lapangan. Tebal lapisan bawah pertama sebesar 0.7 m pada bagian lengan dan 1 m di bagian kepala. Lapisan ketiga adalah lapisan inti, berat butiran di lapisan inti berkisar antara 8kg – 2.67 kg untuk bagian lengan dan kepala. Lebar puncak dan tebal lapisan dari lapisan inti menyesesuaikan kondisi. Lapisan pelindung kaki, pada lapisan ini bagian kepala dan lengan groin memiliki berat butiran, lebar puncak, dan tebal lapisan yang sama.
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The Gebangsawit estuary, located in Majakerta Village, Balongan District, Indramayu Regency, has been used by residents as a shipping lane for ships from the local fishing port. The condition of the Gebangsawit estuary is very concerning because the estuary is very shallow, so dozens of fishing boats find it difficult to enter the estuary to dock and choose to anchor their ships at the Pertamina jetty, eventually disrupting the flow of ships going to Balongan ertamina Port. Although there is already a short jetty on one side of the estuary, the presence of a jetty is still not optimal. With the condition of the Gebangsawit estuary, this siltation can be overcome by constructing a groin as an estuary protection structure, which prevents sedimentation from entering the estuary. However, the condition of the Gebangsawit Estuary River has the potential to experience situation in the rotational channel of large ships that will stop, which is dominated by waves with long shore sediment transport moving north, which is indicated by the deflection of the river mouth. The same as the direction of longshore sediment transport. This will undoubtedly impede industrial processes on jetty involving large ships. Prevent and minimize this, it is necessary to build a new estuary protective building considering that the existence of a jetty is an important component that has an impact on industrial processes in the area. The planned building is in the form of a groyne with the function of protecting the river mouth from water scouring and preventing sedimentation from entering the river mouth, which will cause silting in the ship's rotation area. The building that will be made is in the form of a groyne, and when planning the building it is necessary to pay attention to field conditions, which are muddy areas and prone to silt deposits. Building planning includes wave forecasting, calculation of return period waves, wave modeling, and structural planning. Wave analysis includes forecasting a 50-year wave using the 1984 Short Protect Manual method and a 50-year return period wave using the Weibull distribution. Then, the results will be modeled in the Delft 3D software. From the modeling, one can know the wave height of the plan. Then they calculated the elevation of the structure to the existing wave conditions, storm surge, wave run-up, wave et-up, and sea level rise due to global warming. The results of wave forecasting and a 50-year return period produce deep sea waves of Hs = 2,319 m. Wave transformation using Delft3D produces waves in front of the structure with Hs = 1.67 m. Therefore, a groyne structure with a peak elevation of +5.51 m MSL was designed with three layers of protection made of crushed stone. The first layer is the protective layer. The grain weight of the main protective layer is 0.6 tons for the arms and 1.6 tons for the head. The width of the crest and the thickness of the main shield are 1.5 m for the arms and 2m for the head. The second layer can be called the first undercoat. The grain weight for the first undercoat is in the range of 0.06 tons–0.03 tons at the sleeves and 0.16 tons–0.08 tons at the head. The width of the crest on the head and arms adjusts to conditions in the field. The first undercoat is 0.7 m thick on the arms and 1 m on the head. The third layer is the core layer. The grain weight in the core layer ranges from 8 kg to 2.67 kg for the arms and head. The peak width and layer thickness of the core layer are subject to conditions. Foot protection layer. In this layer, the groyne head and arms have the same grain weight, peak width, and layer thickness.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Angin, Delft3D, Gebangsawit, Groin, Pasang Surut, Delft3D, Gebangsawit, Groin, Tide, Wind
Subjects:	T Technology > TH Building construction > TH900+ Construction equipment in building construction
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	07 Jan 2026 07:36
Last Modified:	07 Jan 2026 07:36
URI:	http://repository.its.ac.id/id/eprint/129351

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