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Journal of Marine Resources and Coastal Management
Published by Universitas Islam Negeri Sunan Ampel
ISSN : -     EISSN : 27220966     DOI : -
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science
Journal of Marine Resources and Coastal Management is a peer-reviewed journal published biannually by the Marine Science Departement, Faculty of Science and Technology, UIN Sunan Ampel. The Editors welcome contributions from research, which consider marine natural resources and coastal area with emphasis on environmental, technological, economic, institutional and policy aspects of conservation and utilization of marine resources and coastal zone management practices.
Arjuna Subject : Ilmu Lingkungan (semua ketegori) - Ilmu Lingkungan (Lain-Lain)
Articles 75 Documents
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Characterization of water masses in the Sulu Sea using temperature–salinity (T-S) diagrams, dissolved oxygen, and chlorophyll-a distribution Firdaus, Muh; Mauludiyah
Journal of Marine Resources and Coastal Management Vol. 7 No. 2 (2026)
Publisher : UIN Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29080/mrcm.v7i2.2606

Abstract

The Sulu Sea is a semi-enclosed tropical marginal basin influenced by complex exchanges between the South China Sea and the western North Pacific, resulting in distinctive hydrographic and biogeochemical characteristics. This study aims to characterize the water masses of the Sulu Sea using temperature–salinity (T–S) analysis and to examine the vertical distributions of dissolved oxygen (DO) and chlorophyll-a as indicators of biophysical processes. A key novelty of this study is the integration of T–S analysis with DO and chlorophyll-a observations to provide a comprehensive assessment of the relationships among water-mass structure, ventilation processes, and biological productivity in the Sulu Sea. The analysis was based on Conductivity–Temperature–Depth (CTD) observations collected at 22 stations during the SEAFDEC cruise in March–April 2015, with profiling depths reaching approximately 750 m. The T–S analysis identified two dominant upper-ocean water masses: Subtropical Lower Water (SLW), characterized by a salinity maximum of 34.5–34.9 psu within the thermocline layer (150–250 m), and North Pacific Upper Thermocline Water (NPUTW), which was primarily observed in the eastern stations and indicates the influence of Pacific inflow through the Bohol–Dipolog pathway. Dissolved oxygen exhibited strong vertical stratification, with high concentrations (>5 mg L⁻¹) in the surface layer and reduced values (~2 mg L⁻¹) below the thermocline due to limited ventilation and organic matter remineralization. Chlorophyll-a was concentrated within the upper euphotic zone and near the thermocline, reflecting the combined influence of stratification and nutrient availability. The integrated analysis demonstrates that water-mass distribution, oxygen dynamics, and phytoplankton variability are closely linked to circulation pathways and vertical stratification. These findings provide new insight into the coupling between physical and biogeochemical processes in the Sulu Sea and contribute to improving the understanding of tropical marginal sea ecosystems.
Assessment of coral health and lifeform composition using the CoralWatch method at Tunda Island, Banten, Indonesia Mumtasya, Lenia; Fariz, Arya Nural; Mauludiyah; Idris
Journal of Marine Resources and Coastal Management Vol. 7 No. 2 (2026)
Publisher : UIN Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29080/mrcm.v7i2.2567

Abstract

The waters surrounding Tunda Island support coral reef ecosystems ranging from low to moderate condition, which nevertheless provide essential ecological functions for marine life and coastal communities. Coral reefs are formed through the deposition of calcium carbonate produced by reef-building corals in symbiosis with Symbiodinium. These symbiotic algae perform photosynthesis, supplying a substantial portion of the energy required by their coral hosts while contributing to coral pigmentation and overall reef health. However, coral health is increasingly threatened by environmental stressors, including rising sea temperatures and declining water quality. This study aimed to assess the health status of corals at Tunda Island, Indonesia, using the CoralWatch method based on changes in coral tissue coloration. Data were collected through random surveys at six observation stations distributed around Tunda Island. The results showed that the coral community was dominated by branching corals (36.8%), followed by boulder (26.1%), plate (25.7%), and soft corals (11.4%). Coral health assessment indicated that most colonies were under moderate physiological stress, with color Scores 3 (34.2%) and 4 (54.4%) being the most frequently recorded categories, reflecting reduced pigmentation and an increased susceptibility to bleaching. These findings provide baseline information for long-term coral reef monitoring and highlight the importance of sustainable coastal management to reduce environmental stress and maintain coral reef resilience at Tunda Island.  
Hydrodynamic modeling using Delft3D for port safety in Bawean waters, Indonesia Asmara, Syafiq; Prasetyono, Satria Dermaga; Pramanda, Brilian Putra; Fahmi, Muhammad Yunan
Journal of Marine Resources and Coastal Management Vol. 7 No. 2 (2026)
Publisher : UIN Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29080/mrcm.v7i2.2563

Abstract

This study aims to assess the hydrodynamic conditions of the waters around Bawean Port, Gresik, using Delft3D numerical modeling to support navigational safety. A quantitative approach was applied using nested-grid simulations to capture both large-scale and detailed hydrodynamic processes. The model incorporated bathymetry, tidal forcing, wind, and wave data obtained from global datasets, including GEBCO, TPXO 8.0, and ECMWF ERA5. Simulations were conducted for two representative monsoon seasons, namely the west monsoon (January) and east monsoon (July), with each simulation covering a one-month period. The results indicate that water depths in the study area range from 0 to 6 m, highlighting the need for careful management of port and shipping lane depths to ensure navigational safety. Tidal analysis indicates a mixed tide with a predominantly semi-diurnal character. Model validation showed good agreement with observed data, with RMSE and MAE values of 0.0581 m and 0.0426 m, respectively, indicating good model performance. The hydrodynamic analysis revealed distinct seasonal variations in wind and wave characteristics, with dominant winds originating from the west and northwest during the west monsoon and from the east and southeast during the east monsoon. Maximum wave heights reached 1.55 m during the west monsoon and 1.83 m during the east monsoon. Current velocities were generally low, ranging from 0 to 0.4 m/s, with flow directions influenced by tidal conditions and coastal structures, particularly harbor piers. Based on these findings, dredging of the shipping lanes is recommended to provide sufficient depth for larger vessels, while appropriate speed restrictions are recommended to maintain vessel stability and navigational safety. Overall, the modeling results provide important insights into the tidal, current, and wave dynamics of Bawean waters and can support shipping lane management, port planning, and coastal management.
Simulation of sea breeze events during the 2024 dry season along the Cilacap coastline, Indonesia, using the WRF model with satellite data assimilation Arzhida, Bima; Haryanto, Yosafat Doni; Avrionesti; Sabrina , Purwanti Lelly
Journal of Marine Resources and Coastal Management Vol. 7 No. 2 (2026)
Publisher : UIN Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29080/mrcm.v7i2.2617

Abstract

Sea breeze is a coastal meteorological circulation driven by the thermal contrast between land and adjacent water. This study identified and simulated selected sea-breeze events over the Cilacap coastal region during the dry season (May–August 2024). A modified objective filtering procedure was applied using wind speed, wind direction, a positive land–coastal surface air temperature difference, flow persistence, and precipitation. Two events were selected, occurring on 14 May and 24 August 2024. These events were simulated using the Weather Research and Forecasting–Advanced Research WRF model with three-dimensional variational assimilation of Himawari-9 infrared radiance data. The horizontal fields showed that onshore flow began to develop at approximately 11:00 LT and became most continuous around 13:00 LT. On 14 May, the circulation weakened by approximately 17:00 LT, whereas on 24 August it remained identifiable until approximately 19:00 LT. Statistical evaluation against automatic weather station (AWS) observations yielded wind-speed correlation coefficients of 0.534 and 0.923, with root mean square error (RMSE) values of 1.196 and 0.851 m/s for 14 May and 24 August, respectively. Wind-rose comparisons showed generally consistent onshore directional patterns, although differences remained in directional frequency and wind-speed classes. Because no unassimilated WRF control experiment was conducted, the verification assesses only the agreement between the WRF Data Assimilation (WRFDA) simulation and AWS observations and does not quantify the added value of Himawari-9 data assimilation.
Analysis of coral cover using the Underwater Photo Transect (UPT) method on Tidung Island, the Thousand Islands, Indonesia Effendi, Muhammad Ardiansyah; Maisaroh, Dian Sari; Munir, Misbakhul; Widodo, Mikael Prastowo Sesotyo
Journal of Marine Resources and Coastal Management Vol. 7 No. 2 (2026)
Publisher : UIN Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29080/mrcm.v7i2.2740

Abstract

Coral reef ecosystems are important marine ecosystems that provide ecological, economic, and social benefits, but their condition is increasingly threatened by anthropogenic activities and environmental pressures. Tidung Island is a marine tourism destination with relatively high human activity, which may affect the condition of its coral reef ecosystem. This study aimed to assess the condition of coral reef cover and identify the environmental conditions associated with differences in coral reef conditions around Tidung Island, Thousand Islands, DKI Jakarta. The study was conducted from May, 14–18 2026 using a quantitative descriptive approach. Coral cover data were collected using the Underwater Photo Transect (UPT) method at four observation stations, with photographs analyzed using Coral Point Count with Excel extensions (CPCe). Hydro-oceanographic parameters, including temperature, salinity, water clarity, and pH, were also measured at each station. The results showed considerable variation in live coral cover among stations. Station 3 had the highest coral cover at 55.3% and was categorized as good, while Stations 1 and 2 had coral cover of 31.6% and 31.4%, respectively, and were categorized as moderate. Station 4 had the lowest coral cover at 3.3%, indicating a degraded condition. The overall average coral cover was 30.5%, indicating that the general condition of coral reefs ranged from moderate to degraded. Hydro-oceanographic parameters generally fall within a range that supports coral reef development, with temperatures of 30–31°C, salinity of 30–31‰, water clarity of 5–8 m, and a pH of 7. Therefore, anthropogenic pressures and physical disturbances—particularly tourism, boat moorings, fishing, and maritime transportation—are suspected to be factors contributing to coral reef degradation, rather than the measured hydro-oceanographic conditions. These findings highlight the need for better management, reduction of anthropogenic pressures, and more intensive conservation efforts to support the recovery and sustainability of coral reefs around Tidung Island.

Page 8 of 8 | Total Record : 75

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