Analisis Perilaku Gerak Dan Gaya Tali Tambat Sistem Taut Pada Floating Breakwater Tipe Gergaji Berpori

Habibi, Thomi (2020) Analisis Perilaku Gerak Dan Gaya Tali Tambat Sistem Taut Pada Floating Breakwater Tipe Gergaji Berpori. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia merupakan negara kepulauan yang memiliki sekitar 17.499 pulau yang tersebar dari Sabang sampai Merauke. Indonesia merupakan negara pesisir yang memiliki garis pantai sepanjang 99.093 km. Sebagai sarana transportasi laut, Indonesia mengandalkan kapal yang memerlukan bangunan pelindung pantai ketika akan bersandar di pulau. Salah satu jenis bangunan pelindung pantai adalah floating breakwater. Floating breakwater merupakan bangunan pemecah gelombang yang mengapung dan ditambatkan dengan tali tambat (mooring line) agar posisinya tetap pada tempatnya. Mooring line merupakan aspek penting bagi floating breakwater. Oleh karena itu, penelitian ini dilakukan untuk menganalisis perilaku gerak dan gaya tali tambat sistem taut pada floating breakwater tipe gergaji berpori. Analisis ini dilakukan dengan memodelkan floating breakwater berdasarkan data percobaan floating breakwater yang telah dilakukan. Data percobaan tersebut berupa variasi elevasi muka air (d) sebesar 41 cm, 43 cm dan 45 cm, sudut mooring (θ) sebesar 30⁰, 45⁰ dan 60⁰, tinggi gelombang (Hs) sebesar 3 cm, 4 cm dan 5 cm dan periode gelombang (T) 1,1 detik, 1,3 detik dan 1,6 detik. Setelah itu, model disimulasikan pada software Computational Fluid Dynamic (CFD). Simulasi ini dilakukan untuk mengetahui hasil respon gerak (Response Amplitude Operator) dan tegangan tali tambat floating breakwater tipe gergaji berpori. Hasil RAO floating breakwater ini berada pada frekuensi rendah. Gerakan RAO umumnya didominasi oleh gerakan sway, heave dan roll. Dengan nilai RAO terbesar berada pada gerakan roll. Hasil tegangan mooring floating breakwater tipe ponton dan gergaji berpori terbesar berada pada sudut mooring 30⁰ dan elevasi muka air 45 cm berturut-turut sebesar 4,593 N dan 3,811 N, sedangkan nilai tegangan mooring terkecil terjadi pada sudut mooring 60⁰ dan elevasi muka air 41 cm berturut-turut sebesar 0.09 N dan 0.079 N. Selain itu, floating breakwater tipe gergaji berpori memiliki besar tegangan mooring yang lebih kecil sekitar 1%-8% dibandingkan floating breakwater tipe ponton. ================================================================================================ Indonesia is an archipelago country that has 17,499 islands spread from Sabang to Merauke. Indonesia is a coastal country which has coastline length 99,093 km. As a modes of sea transportation, Indonesia depends on ships that need shore protector structures when they docked on the island. The one of coastal protector buildings is floating breakwater. Floating breakwater is a breakwater that floats and it’s moored with mooring system so that the position is fixed in it’s place. Mooring system is an important aspect for floating breakwater. Therefore, this study was conducted to analyze the motion behavior and mooring forces of taut system on porous saw type floating breakwater. This analysis is done by modeling floating breakwater based on floating breakwater experimental data that has been done. The experimental data are the variation of water level elevation (d) of 41 cm, 43 cm and 45 cm, mooring angle (θ) of 30⁰, 45⁰ and 60⁰, wave height (Hs) of 3 cm, 4 cm and 5 cm and wave period (T) 1.1 seconds, 1.3 seconds and 1.6 seconds. After that, the model is simulated on Computational Fluid Dynamic (CFD) software. This simulation is carried out to know the results of motion response (Response Amplitude Operator) and the porous saw type floating breakwater mooring tension. The RAO floating breakwater results are in low frequency. The RAO movements are generally dominated by movement of sway, heave and roll. The largest RAO value is on the movement of roll. The results of the pontoons and porous saws floating breakwater mooring tension are at mooring angle of 30⁰ and the water level elevation of 45 cm are in a row 4,593 N and 3,811 N, while the smallest mooring tension value occurs at the mooring angle of 60⁰ and the water level elevation of 41 cm are in a row 0.09 N and 0.079 N. In addition, the porous saw floating breakwater has a smaller mooring tension than pontoon floating breakwater are approximately 1% -8%.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: floating breakwater, computational fluid dynamic, mooring angle, response amplitude operator and mooring tension, floating breakwater, computational fluid dynamic, sudut mooring, response amplitude operator dan tegangan mooring
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering > TC333 Breakwaters
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: Thomi Habibi
Date Deposited: 12 Aug 2020 02:13
Last Modified: 24 Jan 2022 09:03
URI: https://repository.its.ac.id/id/eprint/77498

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