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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan
Rachman, Reno Arief
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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Kajian Kualitas Perairan Laut Sekitar Muara Sungai Jelitik Kecamatan Sungailiat – Kabupaten Bangka Wibowo, Mardi; Rachman, Reno Arief
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 17, No 1 (2020): Maret 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (310.523 KB) | DOI: 10.14710/presipitasi.v17i1.29-37

Abstract

Jelitik River is the main river and economic artery of Sungailiat District, Bangka Regency. Currently around the Jelitik River there is a Jelitik Fishing Port and is developed as an industrial area. In addition to the problems of sedimentation problems with the development of industrial estates and the presence of sand mining rich in tin ore on land and on the high seas it is feared that it will reduce the quality of the environment, especially the surrounding sea water. Therefore, this study is needed in order to find out the quality of waters in this estuary which can be used as a basis or baseline for the initial environment of this region if later this area will be developed as a port or industrial area. The method used in this study is field observation, water sampling, and laboratory analysis. Therefore, as an initial step, it is necessary to identify the quality of the waters in this estuary which can be used as the basis or initial environmental baseline of this area if later this area will be developed as a port or industrial area. Based on observations in the field of laboratory analysis of water samples, generally the quality of seawater around the estuary of Jelitik River still meets seawater quality standards both for port activities, marine tourism and for biota. Some parameters that exceed the quality standard include total suspended solid (TSS) which reaches 250 mg/l, total dissolved solids (TDS) which reaches 24,700 mg/l and nitrate content which reaches 0.38 mg/l. BOD value is 4.7 mg / l and COD is 46.4 mg / l, these parameters are still below the existing sea water quality standard.
Assessment of Sensitivity and Validity Hydrodynamic Model in Cisadane Using Delft3d Flow Model Pasma, Gumilang Ramadhan; Suharyanto, Hamzah Haru Radityo; Khoirunnisa, Hanah; Wijayanti, Reni; Gumbira, Gugum; Rachman, Reno Arief
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 1 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.1.133-146

Abstract

The National Capital Integrated Coastal Development (NCICD) program was prioritized as a disaster reduction technology within the annual target of BRIN in 2022. It is a part of the North Java Coastal Integrated Development Program project. A coastal reservoir development plan at the Cisadane River estuary is one of the outcomes. In this case, hydrodynamic modelling is needed to acquire hydrodynamic properties under the existing condition of Cisadane downstream, and it applied the Delft3D-FLOW model. The bathymetric data used in this simulation was obtained from the assimilation of national bathymetric data with a grid spacing of 180 m and field survey data with a horizontal resolution of 10 m and transect spacing of 200 m seaward of the Cisadane estuary. It has interpolated in a regular structured grid with 100 m and 50 m grid spacing. In addition, other data used are three hourly wind data downloaded from the European Centre for Medium-Range Weather Forecasts (ECMWF) and the daily discharge of the Cisadane River in 2021. Astronomical water level data generated from TPXO 7.2 and TPXO 8 were used in the boundary conditions. These data are simulated using the two and three-dimensional flow model Delft3D-FLOW during November 1 – 15, 2021, using four manning coefficients (n) values, which are 0.03; 0.035; 0.04; and 0.045. The validation formulation used Normalization Root Mean Square Error (NRMSE), resulting in 5.3 - 9.6% for all the manning values and domains. The highest correlation coefficient of current velocity (u-v components) is acquired in the 10 km2 domain with 0.797 for the L3 (bottom layer).
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. 
Co-Authors Aziiz, Shafan Abdul Catur Istiyanto, Dinar Firmansyah, Raka Gumbira, Gugum Hanah Khoirunnisa, Hanah Mardi Wibowo Pasma, Gumilang Ramadhan Rahili, Nurkhalis Reni Wijayanti Suharyanto, Hamzah Haru Radityo Widagdo, Aloysius Bagyo