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All Journal Journal of Marine Resources and Coastal Management
Fahmi, Muhammad Yunan
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science

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Density of gastropods and bivalves in coral reefs of Gili Island, Gresik Regency, Indonesia Wahyunita, Fitrana; Fahmi, M. Yunan
Journal of Marine Resources and Coastal Management Vol. 5 No. 2 (2024)
Publisher : UIN Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29080/mrcm.v5i2.2295

Abstract

Gastropods and bivalves play a crucial role in the marine food web within coral reef ecosystems. This study aimed to identify gastropod and bivalve species and analyze their density in the coral reef ecosystem of Gili Island, Gresik Regency, East Java. Sampling was conducted using the belt transect method (100 meters in length and 5 meters in width), placed parallel to the shoreline at three selected research stations. A total of 19 individuals, representing two families of gastropods and bivalves, were identified. Species density ranged from 0.005 to 0.035 individuals/m², while relative density values ranged from 11% to 78%. The results indicate that the density and distribution of gastropods and bivalves in Gili Island waters are influenced by substrate types and water quality parameters.
Comparative tidal analysis using Admiralty and Least Square methods at Tanjung Perak Port, Surabaya, Indonesia Calista, Tsabitah Nandiantara; Nadar, Harman; Sawiji, Asri; Fahmi, Muhammad Yunan
Journal of Marine Resources and Coastal Management Vol. 6 No. 1 (2025)
Publisher : UIN Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29080/mrcm.v6i1.2315

Abstract

This study evaluates tidal predictions using the Admiralty and Least Square methods by comparing their performance against real-time measurement and prediction data at Tanjung Perak Port, Surabaya, East Java. The analysis focuses on differences in harmonic components, tidal classifications, and tidal elevations. Results reveal a shift in Formzahl values from Mixed Tide, Prevailing Semidiurnal (1.494) in real-time data to Mixed Tide, Prevailing Diurnal (1.922) in prediction data, primarily due to variations in the amplitude of diurnal and semi-diurnal constituents. High correlation coefficients and low RMSE values demonstrate that both methods are suitable for tidal forecasting, with the Least Square method offering more refined long-term analysis and the Admiralty method showing greater efficiency in short-term tidal calculations. These findings contribute to improved maritime operations, coastal management, and sediment transport modeling, and highlight the importance of continued validation and methodological refinement to enhance predictive accuracy.
Performance of refrigeration unit using monitoring of temperature, humidity and power consumption of freezer machine at Jaya Bahari cold storage Nugrowibowo, Radityo; Sawiji, Asri; Fahmi, Muhammad Yunan
Journal of Marine Resources and Coastal Management Vol. 4 No. 2 (2023)
Publisher : UIN Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29080/mrcm.v4i2.1898

Abstract

Fishery products generally spoil more quickly than other animal meat products. After being caught, fish will experience changes in quality, the level of these changes will determine the shelf life of the fish. Handling fresh fish is the most important aspect of a fisheries business. Cold storage is a way of storing fish at a certain temperature which allows fresh fish to be stored for long periods, even months, to prevent bacterial growth. This research aims to evaluate the implementation of the Standard Operating Procedure (SOP) for storing fish in cold storage using the First In First Out (FIFO) system and to evaluate the quality of the cooling system using temperature and humidity monitoring at Jaya Bahari cold storage. The method used in this research is measurement, interviews and literature study. The process stages in receiving fish products start from unloading fish, thawing frozen fish, weighing and testing samples, sorting and calculating the percentage of rejects, as well as temporary storage by looking at various obstacles during the process of receiving raw materials. The performance of the data logger and big data each showed results that were not much different with the respective tool accuracy values of 99.26% for temperature measurements and 99.83% for humidity measurements. Defrosting ice for 2 hours can save power by 4.37%.
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.
Wave and current characteristics for navigation safety assessment at Kalbut Port, Indonesia Aisy, Aqila Rihadatul; Putra, Dimas Eka; Putra, Rahmatullah Hernanda; 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.v7i2.2559

Abstract

Kalbut Port, located in Situbondo, East Java, Indonesia, is an important port serving small vessels operating routes to the Madura Islands and tankers transporting liquefied petroleum gas (LPG) and crude oil. Ensuring navigational safety and efficient loading and unloading operations under variable wave and current conditions requires a comprehensive understanding of the local hydro-oceanographic characteristics. This study quantitatively investigates the current and wave conditions at Kalbut Port using secondary data and Delft3D hydrodynamic and wave modeling. The simulations were conducted for the east and west monsoon seasons. The results indicate a mixed tidal regime with a predominance of semi-diurnal characteristics. Dominant winds originate from the southeast during the east monsoon and from the west during the west monsoon. Significant wave heights reach 0.5 m during the east monsoon and 0.7–0.8 m during the west monsoon, while current velocities remain relatively low, with maximum values below 0.3 m/s during the west monsoon. Within the port basin, wave heights decrease to approximately 0.1 m due to the sheltering effect of the breakwater and the progressively shallower bathymetry. Model performance was evaluated against observed tidal elevations and significant wave heights. Tidal validation yielded an RMSE of 0.013 and an MAE of 0.009, whereas wave validation produced an RMSE of 0.131 and an MAE of 0.105. These relatively low error values indicate that the model adequately represents the hydrodynamic and wave conditions in the study area. Overall, wave and current conditions at Kalbut Port remain below the applicable navigation safety thresholds, indicating a relatively low navigation risk for both small vessels and tankers. The findings provide a scientific basis for assessing and mitigating navigation risks and supporting safer maritime operations at Kalbut Port.
Co-Authors Aisy, Aqila Rihadatul Asmara, Syafiq Asri Sawiji Calista, Tsabitah Nandiantara DIMAS EKA PUTRA Nadar, Harman Nugrowibowo, Radityo Pramanda, Brilian Putra Prasetyono, Satria Dermaga Putra, Rahmatullah Hernanda Wahyunita, Fitrana