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Agus Alim Hakim
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Center for Coastal and Marine Resources Studies (CCMRS) Kampus IPB Baranangsiang, Jl. Raya Pajajaran No. 1, Bogor, Jawa Barat, Indonesia 16127
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COJ (Coastal and Ocean Journal)
Published by Institut Pertanian Bogor
ISSN : -     EISSN : 25498223     DOI : https://doi.org/10.29244/COJ.5.1
Core Subject : Agriculture, Social,
Agriculture, Biological Sciences & Forestry Environmental Science Social Sciences
COJ (Coastal and Ocean Journal) memiliki ISSN Online: 2549-8223 adalah Jurnal yang dikelola oleh Pusat Kajian Sumberdaya Pesisir dan Lautan, Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), IPB University, dengan tujuan menyebarluaskan informasi tentang perkembangan ilmiah bidang pengelolaan wilayah pesisir dan lautan di Indonesia. Yang dimaksud dengan perkembangan ilmiah, pengelolaan, inovasi dan teknologi bidang pesisir dan lautan di Indonesia antara lain: Pengelolaan Perikanan, Pengolahan Hasil Laut, Bioteknologi Kelautan, Pengelolaan Sumberdaya Perairan, Pengelolaan Sumberdaya Pesisir dan Lautan, Pemetaan Wilayah Pesisir dan Laut, Hukum dan Sosial Ekonomi Wilayah Pesisir dan Laut, Sistem Sosial dan Ekologi Pesisir dan Lautan, Jasa Ekosistem Pesisir dan Lautan, Konservasi Sumberdaya Pesisir dan Laut serta Pengendalian Pencemaran Lingkungan Pesisir dan Lautan. Berdasarkan Surat Keputusan ISSN LIPI bahwa Coastal and Ocean Journal telah terdaftar dalam ISSN online dengan Nomor SK no. 0005.25498223/JI.3.1/SK.ISSN/2017.03 - 8 Maret 2017. Naskah yang masuk ke COJ akan dicek mengenai pedoman penulisannya oleh Administrasi, apabila sudah sesuai akan direview oleh 1 (satu) orang Dewan Penyunting dan 1 (satu) orang Mitra Bestari (Peer-Reviewer) berdasarkan penunjukan dari Ketua Dewan Penyunting. Keputusan diterima atau tidaknya suatu naskah menjadi hak dari Ketua Dewan Penyunting berdasarkan atas rekomendasi dari Dewan Penyunting dan Mitra Bestari. Jurnal COJ terbit 2 kali dalam 1 tahun (Juni dan Desember) Focus and Scope Pengelolaan Perikanan Pengolahan Hasil Laut Bioteknologi Kelautan Pengelolaan Sumberdaya Perairan Pengelolaan Sumberdaya Pesisir dan Lautan Pemetaan Wilayah Pesisir dan Lautan Kebijakan dan Ekonomi Wilayah Pesisir dan Lautan Sistem Sosial dan Ekologi Pesisir dan Lautan Jasa Ekosistem Pesisir dan Lautan Konservasi Sumberdaya Pesisir dan Lautan Pengendalian Pencemaran Lingkungan Pesisir dan Lautan
Arjuna Subject : Ilmu Lingkungan (semua ketegori) - Ilmu Lingkungan (Lain-Lain)
Articles 85 Documents
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inggris Basir, Noerdin; Tetsuya, Hiraishi
Coastal and Ocean Journal (COJ) Vol 9 No 2 (2025): COJ (Coastal and Ocean Journal)
Publisher : Pusat Kajian Sumberdaya Pesisir dan Lautan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/coj.v9i2.313896

Abstract

While the XBeach model has been validated for complex coastal processes under storm conditions, its performance in predicting hydrodynamics and morphodynamic changes under controlled, small-scale regular wave scenarios—a critical gap for foundational calibration and understanding—remains less documented. This study addresses this gap by rigorously validating XBeach's capability to simulate regular wave propagation and the consequent coastal erosion in a controlled laboratory environment. The experiment was conducted in a 30 m flume at Kyoto University's UJIGAWA laboratory, using a piston-type wavemaker to generate nine regular wave cases (wave heights: 1.68–3.3 cm; periods: 0.83 s and 1.205 s). Model accuracy was quantitatively assessed using the Mean Absolute Error (MAE). The results demonstrate that XBeach proficiently simulates both hydrodynamic and morphodynamic processes. The validation for significant wave height yielded an MAE of 0.07, while the validation for the eroded area yielded an MAE of 0.05 (5%). Both MAE values are below the 10% sufficiency threshold, confirming the model's reliability in predicting wave transformation and erosion magnitude under regular wave forcing. This study provides a foundational validation benchmark, enhancing confidence in applying XBeach for coastal erosion prediction in scenarios dominated by monochromatic wave conditions.
Economic Impact Analysis of Reclamation Activities on Rampus (Gillnet) Fishery in Kaliadem, Muara Angke, North Jakarta Kusumastanto, Tridoyo; Sobirin, Akhmad; Nababan, Benny Osta; Indah, Mega Natasha
Coastal and Ocean Journal (COJ) Vol 9 No 2 (2025): COJ (Coastal and Ocean Journal)
Publisher : Pusat Kajian Sumberdaya Pesisir dan Lautan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/coj.v9i2.324636

Abstract

The Jakarta Bay reclamation has impacted capture fisheries, such as rampus (gillnet) fishermen in Kaliadem. This study aims to analyze the economic impacts of reclamation including its adaptation strategies, fishing business unit feasibility, fishermen’s welfare, and post-reclamation policy options. Data were collected through surveys and a census and analyzed using analyses of spatial characteristics, feasibility, Fishermen Exchange Rate (NTN), qualitative description, and policy alternatives. The results indicate that the primary fishing grounds of rampus fishermen are directly affected by reclamation. The fishing units remain viable both before and after reclamation. Fishermen experienced a 41.86% decrease in income per trip, a 59.19% reduction in crew wages per trip, and a 38.16% increase in fuel consumption per trip. The Net Present Value (NPV) decreased from IDR 456,251,850 before reclamation to IDR 141,900,795 after reclamation. The Net B/C ratio dropped from 4.43 to 2.58, the Internal Rate of Return (IRR) declined to 30.22%, and the payback period extended by 1.13 years. NTN analysis showed a decline of 0.22 or 22.44% compared to pre-reclamation conditions. Adaptation strategies involve relocating fishing grounds and continuing fishing activities. Proposed alternative policies include increasing vessel size, providing fuel quota subsidies, and fisher relocation.
Bahasa Inggis Ipambonj, Lisa; Kamal, Mohammad Mukhlis; Taryono, Taryono; Mana, Ralph
Coastal and Ocean Journal (COJ) Vol 9 No 2 (2025): COJ (Coastal and Ocean Journal)
Publisher : Pusat Kajian Sumberdaya Pesisir dan Lautan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/coj.v9i2.363893

Abstract

This study examines community perceptions and involvement in coral reef conservation in Awaiama Village, Milne Bay Province, Papua New Guinea, through a social-ecological framework. Fieldwork in October 2024 integrated coral reef assessments with semi-structured interviews involving local stakeholders. Results indicate that coral reefs are important to livelihoods, food security, and cultural heritage. Despite this dependency, the reefs are increasingly threatened by overfishing, destructive fishing practices, and the impacts of climate change. The community exhibits limited ecological awareness and continues relying on unsustainable fishing methods. Although minor signs of reef recovery were recorded in some areas, community participation in formal conservation initiatives remains minimal. Traditional governance structures, such as clan meetings, play a more prominent role in local resource management. However, there is strong support for reef protection and recognition of the value in integrating traditional ecological knowledge with science-based management strategies. The findings highlight the need for co-management approaches tailored to local socio-economic contexts and emphasize education, sustainable practices, and collaborative governance to ensure long-term reef resilience.
Characteristics of Marine Mammal Habitat in Bintuni Bay Ari Gunawan Wardhana; Yonvitner, Yonvitner; Akmal, Surya Gentha
Coastal and Ocean Journal (COJ) Vol 9 No 2 (2025): COJ (Coastal and Ocean Journal)
Publisher : Pusat Kajian Sumberdaya Pesisir dan Lautan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/coj.v9i2.363696

Abstract

Bintuni Bay is one of the most important areas in Eastern Indonesia with high ecological potential, especially for marine mammals. This study aims to observe the presence of marine mammals and analyse water quality characteristics in Bintuni Bay to understand the environmental dynamics that affect the presence of marine mammals. Marine mammal observations were conducted along a predetermined pathway and seawater quality sampling was conducted at 16 points. Environmental parameters analysed included temperature, salinity, turbidity, dissolved oxygen (DO), chlorophyll-a and depth. Parameter determination was based on previous studies of key environmental parameters for marine mammal habitat and available data. Results showed that marine mammals in Bintuni Bay were found in the turbidity interval of 0.2 -16.7 NTU, temperature 24.7-27.4 0C, salinity 21.9 - 29.3 ppt, dissolved oxygen 4.10 - 6.30 mg/L, chlorophyll-a 5.38-49.10 µg/L and depth 10-51 m. This data can be utilized to conduct better environmental management for marine mammals as economic activities in Bintuni Bay increase in the future.
Analisis Perbandingan Pemetaan Ekosistem Bentik Menggunakan Allen Coral Atlas dan Sentinel-2 di Kepulauan Pagai Nurdjaman, Susanna; Saefulloh, Muhammad Abia; Nur, Syarifudin
Coastal and Ocean Journal (COJ) Vol 9 No 2 (2025): COJ (Coastal and Ocean Journal)
Publisher : Pusat Kajian Sumberdaya Pesisir dan Lautan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/coj.v9i2.363710

Abstract

Ekosistem bentik adalah komponen penting dalam ekosistem pesisir, sehingga perlindungannya sangat diperlukan untuk menjaga kesehatan ekosistem. Penelitian ini menyajikan analisis perbandingan pemetaan bentik di Kepulauan Pagai, Sumatera Barat, dengan fokus pada ekosistem bentik. Penelitian ini menggunakan dua sumber citra satelit yang berbeda: Allen Coral Atlas yang diperoleh dari satelit Dove milik Planet Labs dengan resolusi spasial 3-5 meter, dan citra Sentinel-2 dari program Copernicus ESA, dengan resolusi 10 meter. Data Allen Coral Atlas diproses menggunakan Google Earth Engine dan divisualisasikan dalam QGIS, sedangkan data Sentinel-2 diproses menggunakan Snap dan QGIS, mencakup periode yang sama dari tahun 2016-2020. Validasi in situ, berdasarkan data sekunder dari Badan Riset dan Sumber Daya Manusia Kelautan dan Perikanan (KKP), mencakup data lapangan dari enam stasiun di Pagai Utara dan Pagai Selatan. Data ini digunakan untuk memvalidasi keberadaan lamun, mangrove dan karang dan mengidentifikasi spesies di habitat aslinya. Analisis mengungkapkan tingkat kesamaan yang tinggi antara peta dari kedua sumber, terutama dalam pemetaan habitat lamun. Namun, perbedaan dicatat di area yang dipengaruhi oleh tutupan awan dan dinamika sedimen, yang menyebabkan sedikit perbedaan hasil. Secara keseluruhan, perbandingan ini menyoroti keandalan kedua dataset untuk pemetaan bentik, menunjukkan bahwa penggabungan kedua data ini menyediakan data yang kuat untuk validasi lapangan dan penelitian ekologi lebih lanjut, terutama di lingkungan pesisir dinamis di Kepulauan Pagai.

Page 9 of 9 | Total Record : 85

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