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Jurnal Segara

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Published by Kementerian Kelautan dan Perikanan RI

ISSN : 19070659 EISSN : 24611166 DOI : -

Core Subject : Science, Social,

Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology

Jurnal SEGARA (p-ISSN: 1907-0659, e-ISSN: 2461-1166) adalah Jurnal yang diasuh oleh Pusat Riset Kelautan, Badan Riset dan Sumber Daya Manusia Kelautan dan Perikanan (BRSDMKP), Kementerian Kelautan dan Perikanan â€“ KKP, dengan nomenklatur baru Pusat Riset Kelautan, Badan Riset dan Sumber Daya Manusia Kelautan dan Perikanan, KKP dengan tujuan menyebarluaskan informasi tentang perkembangan ilmiah bidang kelautan di Indonesia, seperti: oseanografi, akustik dan instrumentasi, inderaja,kewilayahan sumberdaya nonhayati, energi, arkeologi bawah air dan lingkungan.

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Articles 191 Documents

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Coral Recruitment on Artificial Patch Reefs Deployed in The Marginal Reefs: Effect of Multilevel Substrate on Density of Coral Recruit Munasik Munasik; Agus Sabdono; Eunike Dorothea Hutapea; Sugiyanto Sugiyanto; Denny Nugroho Sugianto
Jurnal Segara Vol 17, No 1 (2021): April
Publisher : Politeknik Kelautan dan Perikanan Dumai

A study of coral recruitment on Artificial Patch Reefs (APR) was performed in the marginal reef of Panjang Island, Central Java (Java Sea) to examine whether multilevel substrates of APR affect the density of coral recruits. Long-term and short-term observations were applied in yearly monitoring 2017-2019 and biweekly observations for 3 months in early 2019. Coral recruitment significantly varied among level substrates of APR (F(a,b) .05=3.08; p-value<0.05) and there was a significant difference at the beginning of the year (F(a,b) .05=5.52; p-value<0.05). The density of recruits on the substrates after 4 years post-deployment of APRs was 0.2 to 129.2 m-2 while the recruitment rate within short-term observations was 0.28-1.28 m-2 per month. The highest coral recruitment occurred at the middle to the top level of APR, while the lowest recruitment was found in the lowest level of APR. This is possibly due to high resuspension from the seabed. Oulastrea was dominant in both long- and short-term recruitment periods while Pocillopora was rare due to post-settlement mortality which trigger the overgrown coral-killing sponges. The results indicated that the adaptation of coral recruitment in the marginal environment is determined by the high recruitment of the small-colony coral species which possessed stress-tolerant for turbidity disturbance, such as Oulastrea crispata. This study suggested that the multilevel substrates, Artificial Patch Reefs (APR) are one of the reef rehabilitation methods which can be applied in the marginal environment enhancing coral recruitment.

Identifying Priority Areas for Coastal Protection Around Java, Indonesia Jimy Kalther; Akemi Itaya
Jurnal Segara Vol 17, No 1 (2021): April
Publisher : Politeknik Kelautan dan Perikanan Dumai

Climate change-induced sea level rise will likely increase the severity of ongoing coastal disasters in Indonesia. The selection and concentration approach should be applied to minimize the costs of conservation when budgets are limited. Prioritizing is then effective in terms of cost effectiveness. We aimed to identify priority areas for coastal protection against sea level rise around Java, Indonesia, using the Marxan model. The model uses systematic planning to select prioritized areas for coastal protection. Three scenarios were developed based on ecological, economic, and disaster elements that were exacerbated by sea level rise. A scenario is defined as a particular simulation circumstance based on assumptions about extrinsic drivers, parameters, and the structure of the model. Coastline length, mangrove coverage, low-elevation area, fishpond area, human settlement area, and the area of zones with the potential for annual rainfall increases acquired from DIVA-GIS and WorldClim were set as environmental factors. There were 60 areas facing the coast among 117 areas. For those protection, it would be fairly costly. We were able to narrow that number down from 18.8% to 62.4% from 117 areas using our method. This might become very cost effective. The most prioritized areas were located in the northern region of Java. These areas can be a focus of preferential effort and funding for conservation. The results of this study will help to make the protection strategy based on not only the magnitude of damage but also the total perspective using public data that is relatively easy to obtain.

Identification of Floating Marine Debris in The Banda Aceh Estuary Koko Ondara; Ruzana Dhiauddin
Jurnal Segara Vol 17, No 2 (2021): Agustus
Publisher : Politeknik Kelautan dan Perikanan Dumai

The coastal area of Banda Aceh City have the potential to be polluted by waste from the mainland as much as 45.41 tons/day. One source of land waste is the Krueng Aceh river, the river has dense residential areas and high community activities such as ports, ship repairs, traditional markets, recreation and fishing activities. This study aims to identify floating debris in the Krueng Aceh estuary. Data collection was carried out at the mouth of the river using a debris trap mounted on the ship that moves periodically and the research time was based on tidal charts. The results showed that type of marine debris found is plastic, cloth, processed wood, rubber and metal. Plastic debris is the most common debris found by 89 % on the surface of the Krueng Aceh estuary at spring tide and neap tide. The highest amount of debris is found in the morning 09.50 AM and 03.32 PM in the evening.

Seagrass Condition at Some Small Islands in The Taka Bonerate National Marine Park, South Sulawesi Indonesia Indarto Happy Supriyadi; Hendrik Alexander William Cappenberg; Sam Wouthuyzen; Muhammad Hafizt; Susi Rahmawati; La Ode Alifatri; Suyarso Suyarso
Jurnal Segara Vol 17, No 2 (2021): Agustus
Publisher : Politeknik Kelautan dan Perikanan Dumai

The assessment of seagrass bed condition in Indonesia still refers to the Decree of the State Minister for the Environment (KMNLH) no. 200 of 2004, which considers only one variable, namely the percentage of seagrass cover. To assess the seagrass beds condition to be more in-depth and meaningful, it is necessary to consider the addition of several variables, such as the biotic variables (seagrass species diversity including macroalgae and macro-benthos components) as well as the abiotic variables (reef flat areas and the substrate components). The purpose of this study is to determine the seagrass beds condition in several small islands in the Taka Bonerate National Marine Park by considering the additional analysis using both biotic and abiotic variables as mentioned above. The methodology used in this study is a combination of the use of the standard seagrass transect method, interpretation of satellite imagery related to the seagrass bottom habitat area, and its components on the reef flat of a particular island, as well as weighting and scoring based on those considered additional variables. By applying the criteria in the method, the seagrass bed conditions were then classified into three categories, namely seagrass in good, moderate, and unfavorable conditions, respectively. The results of the total score assessment on several small islands in Taka Bonerate Islands show that the seagrass bed in Latondu Besar Island is in good conditions with the highest score of (316) compared to Tarupa Besar, Jinato, Rajuni Kecil, and Tinabo Besar Islands with an average score of (173). The results of this study indicate that the assessment of seagrass conditions is more meaningful in terms of seagrass ecology than based on seagrass cover alone. However, this study requires a lot of validation for its application in assessing the condition of seagrass beds in other islands in Indonesia.

Analysis Of Salt Production Location Using The Salt Location Suitability Index To Apply The Continuously Dynamic Mixing In The Greenhouse Salt Tunnel In North Aceh And East Aceh Andi Kurniawan; Abdul Aziz Amin; Gatot Ardian; Mohamad Zaki Mahasin; Rachmad Dian Kuncoro
Jurnal Segara Vol 17, No 2 (2021): Agustus
Publisher : Politeknik Kelautan dan Perikanan Dumai

One of the main potentials of marine resources in Indonesia is salt. Salt production locations are located in various regions of Indonesia. Aceh Province is one of the leading salt-producing areas on the island of Sumatra. Salt production in Aceh faces various challenges, such as the production system and salt production locations' suitability. Therefore, to develop salt production in Aceh, analysis of the production system and suitability of salt production sites are fundamental. This study aims to analyze the production system and the suitability of salt production locations in North Aceh Regency and East Aceh Regency as salt production centers in Aceh Province. This research uses a combination of qualitative and quantitative methods (mixed method) with a descriptive approach. Production system analysis is carried out through direct observation and in-depth interviews with the stakeholders (government and salt farmers). Analysis of the salt location's suitability level was carried out using the Salt Suitability Index (SSI) method. This study shows that the production system in North Aceh and East Aceh districts uses three production methods consisting of boiling seawater, solar evaporation, and a combination of boiling and solar evaporation. The main obstacle to salt production in Aceh is the weather, such as high rainfall and fluctuations throughout the year. Analysis of the suitability of the location of salt production shows the value of the SSI at the salt ponds site in the North Aceh and the East Aceh Regencies is 80% which indicates that the locations are sufficiently appropriate as a salt production site. The results of this study show that the application of the Continuously Dynamic Mixing (CDM) method in Greenhouse Salt Tunnel (GST) technology may be used to improve the quality and quantity of salt production in Aceh.

Concentration of Natural Radionuclide and Potential Radiological Dose of 226Ra to Marine Organism in Tanjung Awar-Awar, Tuban Coal-Fired Power Plant Chairun Annisa Aryanti; Heny Suseno; Muslim Muslim; Wahyu Retno Prihatiningsih; Mohamad Nur Yahya
Jurnal Segara Vol 17, No 3 (2021): Desember
Publisher : Politeknik Kelautan dan Perikanan Dumai

Fly ash and bottom ash from coal combustion can contain natural radionuclides with a certain concentration. The release of fly ash into the environment can potentially increase the concentration of natural radionuclides in the surrounding environment, including marine waters. This study aimed to determine the activity of natural radionuclides in seabed sediments and the radiological impact on marine organisms related to Tanjung Awar-Awar Coal-Fired Power Plant activities in Tuban. The sampling techniques were carried out by the purposive sampling method. The concentration measurement of natural radionuclide activity was carried out using HPGe detector gamma-ray spectrometry at marine radioecology laboratory of National Nuclear Energy Agency. The detected concentration of natural radionuclide activity was 40K ranging from 159.18 to 365.88 Bq.Kg-1, 228Ac ranging from 14.47 to 28.05 Bq.Kg-1, and 226Ra ranging from 15.00 to 67.65 Bq.Kg-1. By using the ERICA Assessment Tool Tier 2 program, the results of the analysis showed that there was no impact of 226Ra radiation on marine organisms at the research site because the total radiation dose rate (external + internal) of 226Ra on marine biota was lower than the screening level of 10 μGy / h. Thus, it will not harm marine ecosystems and the sustainability of marine organisms in the waters of Tanjung Awar-Awar Coal-Fired Power Plant, Tuban.

Hydro-Oceanographic Characteristics In Karimunjawa Coastal Waters During The 1st Transitional Season Yulius Yulius; Joko Prihantono; Dino Gunawan; Muhammad Ramdhan; August Daulat; Nur Kholik Kurniana Putra
Jurnal Segara Vol 17, No 2 (2021): Agustus
Publisher : Politeknik Kelautan dan Perikanan Dumai

This study aims to determine oceanographic characteristics such as tides, waves, and currents in Karimunjawa Coastal Waters during the 1st transitional season and to update the oceanographic database for spatial management evaluation in the region. The tidal characteristics were obtained from the least square method analysis using World Tide software based on Matlab programming language, while wave and current characteristics obtained from 2-dimensional numerical modeling using Mike 21 software on the flow model and spectral wave module. The primary data used were the significant wave height (Hs), wave peak period (Tp), and ocean current components (u and v velocity) on 13-26 May 2016 using the Sontex Argonaut XR type Acoustic Doppler Current Profiler (ADCP) equipment. Tide data were predicted for the Kemujan Islands station from 1-31 March 2020. Secondary data for additional numerical model input were obtained from ERA5-reanalysis in the form of Hs, Tp, u, and v wind velocity data for May 2020 with a temporal resolution of 20 minutes, while bathymetry data derived from GEBCO Satellite Derivated Bathymetry (SDB) data. The tide analysis results showed that Karimunjawa waters are a single daily mixed tidal type. The wave characteristic moves from east to west with high waves reached 0.9 meters and a peak period of 7 seconds. The eastern side of Karimunjawa Island, Kemujan Island, and the western area have a calmer wave. The current characteristic moves northeastward with a speed of 5-28 cm/s, which concludes that in several locations, such as the Menjangan Besar-Menjangan Kecil strait, the currents depend on the tidal conditions.

A New Oceanographic Data Portal: Padjadjaran Oceanographic Data Centre (PODC) Ibnu Faizal; Noir Primadona Purba; Darryl Anthony Valino; Madihah Jafar Sidik; Amarif Abimanyu; Tony Bratasena; Fajri Ramdhani; Ajeng Wulandari
Jurnal Segara Vol 17, No 3 (2021): Desember
Publisher : Politeknik Kelautan dan Perikanan Dumai

Understanding the physio-chemical oceanic and atmospheric processes is critical in monitoring climate change. Archipelagic and Small Island countries are vulnerable to the detrimental effects of climate change, and open access oceanic databases can solve data limitations leading to further development of action plans and government policies. A website was developed (www.isea-podc.org) to distribute and augment free oceanographic data based on various in-situ sampling instruments. Oceanographers review the data collected and stored in the portal. It is led by the Marine Research Laboratory (MEAL), Padjadjaran University, in partnership with Marine Science Institute (MSI), University of the Philippines. This framework supplements information that can support marine ecosystems, fisheries, and climate science studies. Furthermore, all data are accessible to not only the academe but also decision-makers in all aspects. The data sources are student research and the new instruments (RHEA and ARHEA) developed by MEAL. In the future, the portal will be integrated with other government institutional data to provide other functional features and can yield network-wide analyses. In the next phase, collaboration from ASEAN countries should be conducted to gain more impact and provide robust datasets.

Distribution of Tide Type in Indonesian Waters Based on 7 Days Data Measurement of Ipasoet-BIG Station Muhammad Ramdhan; Yulius Yulius; Nindya Kania Oktaviana
Jurnal Segara Vol 17, No 2 (2021): Agustus
Publisher : Politeknik Kelautan dan Perikanan Dumai

Tidal data is needed in the field of energy, marine navigation, coastal construction and other activities related to the oceans. Tidal phenomena occur due to the interaction of the earth with space objects. The sea level rise in coastal waters can be modeled by a harmonic function containing tidal constant numbers. From the constants formed can be calculated a Formzahl number that shows the type of tides that occur at the observation station. This paper tries to describe the distribution pattern of tidal types that exist in Indonesian waters based on data observation collected at station belong to the Geospatial Information Agency. The result is that there are 4 types of tides in Indonesian waters, with the most dominant distribution are mixed tide, prevailing semi diurnal typel.

Determination Of 137CS In Batam Water As South China Sea Extention Using Ammonium Phospomolibdate (AMP) Method Wahyu Retno Prihatiningsih; Heny Suseno; Murdahayu Makmur; Untara Untara; Abarrul Ikram; Mohamad Nur Yahya; Yogi Priasetyono; Deddy Irawan Permana Putra
Jurnal Segara Vol 17, No 3 (2021): Desember
Publisher : Politeknik Kelautan dan Perikanan Dumai

A Study of the Characteristics of the 137Cs of the South China Sea in Batam Waters has been carried out. The South China Sea through several straits is connected to the Pacific Ocean region and the Indonesian Sea. The mass of Pacific water entering the South China Sea will reach Batam Waters with radioactive contaminants. Batam Waters are part of the Karimata Strait which is the Extention Line of South China Sea so that it has the potential to receive 137Cs of radioactive contaminants from operational nuclear reactors discharged in the coastal regions of China. The purpose of the study is to find out the characteristics of 137Cs and obtain the current status of 137Cs as a baseline to minimize the impact of nuclear activities on the ecosystem of the waters of Batam, Indonesia. The 137Cs characterization method uses the Ammonium Phosphomolibdate (AMP) with modification of base dissolution and measurement validation with Certified Reference Material (CRM). The results of monitoring the concentration of 137Cs in seawater in Batam waters are in the range <0.03 - 0.35 ± 0.02 Bq.m-3, while the concentration of 137Cs activity in Batam waters sediments is known to be a maximum of 0.22 ± 0.08 Bq.kg-1 with 134Cs below MDA. Result in seawater and sediments are comparable to previous research related to the presence of radiocesium in the region

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Dani Saepuloh

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