Pemodelan Numerik Refleksi Gelombang pada Tanggul Tegak Multifungsi dengan Variasi Kemiringan Sekat Chamber OWC

Christiana, Cinta Chara (2026) Pemodelan Numerik Refleksi Gelombang pada Tanggul Tegak Multifungsi dengan Variasi Kemiringan Sekat Chamber OWC. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Interaksi gelombang terhadap struktur pelindung pantai tidak hanya berkaitan dengan fungsi perlindungan pantai, tetapi juga dapat dimanfaatkan menjadi pembangkit energi gelombang laut melalui sistem Oscillating Water Column (OWC) yang terintegrasi dengan struktur Tanggul Tegak Multifungsi (TTMF). Salah satu parameter penting dalam mengevaluasi kinerja hidrodinamika struktur tersebut adalah koefisien refleksi gelombang (Kr). Penelitian ini menganalisis hasil pemodelan numerik interaksi gelombang terhadap TTMF menggunakan DualSPHysics dengan variasi kemiringan sekat chamber 10°, 15°, dan 20° pada beberapa kondisi tinggi dan periode gelombang. Hasil penelitian menunjukkan bahwa model numerik memiliki kesesuaian yang baik terhadap uji fisik dengan nilai RMSE sebesar 11.25% sehingga model dinyatakan stabil dan layak digunakan. Analisis hubungan antara Kr dan kecuraman gelombang H/gT² menunjukkan kecenderungan menurun terhadap peningkatan kecuraman, di mana periode gelombang yang lebih panjang secara konsisten menghasilkan refleksi yang lebih tinggi. Konfigurasi kemiringan sekat 10° merupakan yang paling efektif karena menghasilkan nilai refleksi paling rendah dan terkendali serta menjaga stabilitas transmisi energi (Kt < 1.0). Sebaliknya, sudut 15° dan 20° memicu fenomena resonansi kolom air yang menyebabkan amplifikasi elevasi muka air di dalam chamber (Kt > 1.0).
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Wave interaction with coastal protection structures is essential not only for shoreline defense but also for the development of wave energy conversion systems through the integration of an Oscillating Water Column (OWC). The Multifunctional Modular Sea-Dike (TTMF) represents a structural concept that combines wave energy dissipation and energy conversion within a single configuration. The wave reflection coefficient (Kr) is a key hydrodynamic parameter used to assess the performance of such systems. This study investigates the numerical modeling of wave interaction with TTMF using DualSPHysics, incorporating OWC chamber wall slope angles of 10°, 15°, and 20° under several wave height and wave period conditions. Model validation against physical experimental data yielded an RMSE value of 11.25%, indicating good agreement between numerical and laboratory results. The reflection coefficient (Kr) was calculated using the Goda and Suzuki method, and its relationship with wave steepness (H/gT²) was analyzed. The results indicate that Kr generally decreases with increasing wave steepness, with longer wave periods consistently producing higher reflection coefficients. The 10° inclination angle was identified as the most effective configuration due to its ability to produce low, controlled reflection and maintain stable energy transmission (Kt < 1.0). Conversely, the 15° and 20° angles trigger water column resonance, leading to wave height amplification inside the chamber (Kt > 1.0).

Item Type:	Thesis (Other)
Uncontrolled Keywords:	tanggul tegak multifungsi, koefisien refleksi gelombang, pemodelan numerik, DualSPHysics, multifunctional modular sea-dike, wave reflection coefficient, numerical modelling
Subjects:	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 > TC335 Sea-walls--Design and construction
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Cinta Chara Christiana
Date Deposited:	05 May 2026 06:04
Last Modified:	05 May 2026 06:04
URI:	http://repository.its.ac.id/id/eprint/132928

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