Pemodelan Numerik Transmisi Dan Refleksi Pada New Type Floating Breakwater Berpori

Aurellya, Anastasya Haifa (2023) Pemodelan Numerik Transmisi Dan Refleksi Pada New Type Floating Breakwater Berpori. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Abrasi merupakan fenomena yang termasuk ke dalam bencana pesisir karena dapat mengakibatkan pengikisan atau penyempitan garis pantai. Salah satu langkah untuk menghambat abrasi adalah dengan membangun struktur pengaman pantai seperti breakwater. Namun, masalah kembali muncul dalam hal biaya produksi terlebih pada perairan dalam, sehingga digunakan alternatif pengaman pantai lain yaitu floating breakwater. Penelitian ini menggunakan new type floating breakwater berpori atau floating breakwater jenis ponton dengan dua slope berpori untuk diketahui koefisien transmisi dan refleksinya menggunakan metode CFD. Dari simulasi yang telah dilakukan, diketahui bahwa new type floating breakwater berpori memiliki koefisien transmisi yang lebih rendah dan koefisien refleksi yang lebih tinggi daripada single slope floating breakwater berpori. Rata-rata nilai koefisien transmisi untuk model 2 hingga model 5 secara berturut-turut adalah 0,560; 0,676; 0,506; 0,619. Sedangkan rata-rata nilai koefisien refleksi untuk model 2 hingga model 5 secara berturut-turut adalah 0,928; 0,770; 0,869; 0,813. Setelah itu, dilakukan perbandingan model berdasarkan kerapatan porositasnya. Model 6 (sudut slope 45° dan porositas 10%) dan model 7 (sudut slope 60° dan porositas 10%) memiliki nilai rata-rata koefisien transmisi tertinggi (0,723; 0,672) dan nilai rata-rata koefisien refleksi terendah (0,349; 0,457). Dengan kata lain, semakin besar persentase porositas slope, akan semakin besar pula nilai koefisien transmisinya. Sebaliknya, semakin besar persentase porositas slope, semakin kecil koefisien refleksi. Terakhir, penelitian ini juga bertujuan untuk mengetahui pengaruh sudut tali tambat dan kedalaman terhadap koefisien transmisi dan refleksi. Pada variasi sudut kemiringan tali tambat 30°, 45°, 60°, dan 90° didapatkan koefisien transmisi secara berturut-turut 0,246; 0,562; 0,790; 0,860 dan koefisien refleksi secara berturut-turut 0,616; 0,702; 0,813; 0,923. Sedangkan pada kedalaman 65 cm, 75 cm, dan 85 cm didapatkan koefisien transmisi secara berturut-turut 0,628; 0,510; 0,459 dan koefisien refleksi secara berturut-turut 0,455; 0,567; 0,678.
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Abrasion is a coastal disasters phenomenon because it can cause erosion or the constrictions of the coastline. One step to inhibit abrasion is to build coastal safety structures such as breakwater. However, the problem arises in terms of production costs especially in deep waters, so another coastal safety alternative is used, such as floating breakwater. This research uses a new type of porous floating breakwater or pontoon type floating breakwater with two porous slopes to determine the transmission and reflection coefficients using CFD method. From the simulation, we found that the new type of porous floating breakwater has lower transmission coefficient and higher reflection coefficient than the single slope porous floating breakwater. The average transmission coefficient values for model 2 to model 5 are 0.680; 0.616; 0.621; 0.591, respectively. While the average reflection coefficient values for model 2 to model 5 are 0.93; 0.77; 0.87; 0.81, respectively. After that, a comparison of the models based on their porosity density was conducted. Model 6 (45° slope angle and 10% porosity) and model 7 (60° slope angle and 10% porosity) have the highest average transmission coefficient (0.723; 0.672) and the lowest average reflection coefficient (0.349; 0.457). In other words, the higher the percentage of slope porosity, the higher the transmission coefficient. In contrast, the higher the percentage of slope porosity, the lower the reflection coefficient.Lastly, this study also aimed to determine the effect of mooring line angle and depth on the transmission and reflection coefficients. At variations of mooring line inclination angles of 30°, 45°, 60°, and 90°, the transmission coefficients were 0.25; 0.56; 0.79; 0.86 and the reflection coefficients were 0.78; 0.80; 0.61; 0.92, respectively. At depths of 65 cm, 75 cm, and 85 cm, the transmission coefficients are 0.63; 0.51; 0.46 and the reflection coefficients are 0.45; 0.57; 0.68, respectively

Item Type:	Thesis (Other)
Uncontrolled Keywords:	floating breakwater, refleksi, transmisi, slope, porositas, CFD, floating breakwater, reflection, transmission, slope, porosity, CFD
Subjects:	T Technology > T Technology (General) > T11 Technical writing. Scientific Writing T Technology > T Technology (General) > T57.62 Simulation T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics T Technology > TC Hydraulic engineering. Ocean engineering > TC203.5 Coastal engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC333 Breakwaters
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Anastasya Haifa Aurellya
Date Deposited:	22 Jul 2023 09:25
Last Modified:	22 Jul 2023 09:25
URI:	http://repository.its.ac.id/id/eprint/98897

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