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All Journal BULETIN OSEANOGRAFI MARINA Journal of Geoscience, Engineering, Environment, and Technology
Firmansyah, Raka
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Earth & Planetary Sciences Engineering Environmental Science Physics

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Studi Karakteristik Sedimen Menggunakan Metode Statistik Gradistat Untuk Mendukung Pengembangan Pelabuhan Patimban Rachman, Reno Arief; Firmansyah, Raka; Aziiz, Shafan Abdul; Catur Istiyanto, Dinar; Suharyanto, Hamzah Haru Radityo; Rahili, Nurkhalis; Widagdo, Aloysius Bagyo; Wibowo, Mardi; Khoirunnisa, Hanah
Buletin Oseanografi Marina Vol 14, No 1 (2025): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v14i1.60085

Abstract

Pengembangan Pelabuhan Patimban di Subang diharapkan sebagai penyokong pelabuhan Tanjung Priok di Jakarta yang sudah tidak mampu memenuhi kebutuhan bongkar muat dari para pelaku usaha khususnya di Jawa Barat. Dalam melakukan perencanaan dan pengembangan pelabuhan, salah satu hal utama yang perlu dipertimbangkan adalah masalah sedimentasi. Proses sedimentasi di perairan sangat terkait dengan karakteristik sedimen. Tujuan penelitian ini adalah untuk mengetahui pola sebaran karakteristik sedimen dasar seperti kadar air, berat jenis, gradasi, tekstur sedimen, ukuran d50 butir sedimen dan analisis statistik sedimen dasar sehingga dapat mendukung rencana pengembangan pelabuhan. Metode yang dipakai adalah pengambilan sampel sedimen di lapangan, pengujian sampel sedimen di laboratorium, analisis sedimen secara statistik dan analisis deskriptif karakteristik sedimen dasar menggunakan metode Gradistat. Berdasarkan hasil kajian diketahui nilai kadar air 59,06-210,046 %, berat jenis 1,951–2,494 g/cm3, nilai d50 0,07–0,16 mm, ukuran rerata butir 64,0-86,5 µm, sortasi sedimen moderately sorted (terpilah cukup), analisis statistik sedimen tipe platykurtic, jenis lithologi didominasi oleh lanau dan pasir. Diharapkan hasil penelitian ini dapat membantu pengelolaan sedimentasi, merancang pondasi bangunan pantai dan struktur lainnya secara tepat dan efisien. 
Comparison of Laminar, RNG, and LES Model for Wave Propagation Simulation with FLOW-3D Yuniardi, Rizaldi; Istiyanto, Dinar Catur; Wulandari, Ika; Harita, Yofan Tahamano Deo; Firmansyah, Raka; Rachman, Reno Arief
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 3 (2025): JGEET Vol 10 No 03 : September (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.3.13933

Abstract

Understanding wave transformation and its interaction with coastal structures is critical for shoreline protection and design. While physical modeling has traditionally supported such studies, its high cost has led to increased reliance on numerical modeling. This study uses FLOW-3D to simulate wave propagation in a scaled 2D coastal wave channel and compares the performance of three turbulence models: Laminar, Renormalized Group (RNG) k-ε, and Large Eddy Simulation (LES). Simulations are based on a 3-meter wave height, 12-second period, and 7-meter water depth, with wave elevation recorded at six probes along the domain. Results show that the LES model achieved the most accurate prediction, with a significant wave height of 3.01 meters at the structure location—an error of only 0.33%—outperforming RNG and laminar models. These findings highlight the superior turbulence resolution of LES in capturing energy dissipation and wave evolution. The study provides practical guidance for coastal engineers in selecting turbulence models based on accuracy and computational trade-offs. Future research should include model validation with experimental or field data and extend to irregular wave conditions to enhance real-world applicability.
Co-Authors Aziiz, Shafan Abdul Catur Istiyanto, Dinar Hanah Khoirunnisa, Hanah Harita, Yofan Tahamano Deo Ika Wulandari Istiyanto, Dinar Catur Mardi Wibowo Rachman, Reno Arief Rahili, Nurkhalis Suharyanto, Hamzah Haru Radityo Widagdo, Aloysius Bagyo Yuniardi, Rizaldi