Journal of Marine Science
EISSN : 2661-3239
Published by: Bilingual Publishing Co. (10.30564)
Total articles ≅ 35
Latest articles in this journal
Journal of Marine Science, Volume 3; doi:10.30564/jms.v3i2.2859
Coastal vulnerability is a condition of a coastal community or society that leads to or causes an inability to face the threat of danger. The level of vulnerability can be viewed from the physical (infrastructure), social, demographic, and economic vulnerabilities. Physical vulnerability (infrastructure) describes a physical condition (infrastructure) that is prone to certain hazard factors. The coastal vulnerability areas can also be interpreted as a condition where there is an increase in the process of damage in the coastal area which is caused by various factors such as human activities and factors from the nature. This research aims to determine the level of coastal vulnerability in Indramayu coastal Regency with a Coastal Vulnerability Assessment (CVA) analysis approach and a Geographic Information System (GIS). Mapping the status of the vulnerability level of the Indramayu coastal area using the CVA method where the index range generated from the calculation of the four physical parameters mentioned above is between 2.887 – 3.651 or are in moderate vulnerability. A higher vulnerability value is found in several locations such as Juntikedokan and Benda villages. It is necessary to develop coastal protection in this area to prevent damage to the coastal area.
Journal of Marine Science, Volume 3; doi:10.30564/jms.v3i2.2962
The purpose of this study is to meet the maneuverability requirements of the Unmanned Surface Vehicle (USV) in different conditions by the effective use of the bow and stern thruster, thus completing the automatic berthing task. Based on the MMG model, the maneuverability mathematical model of the USV with bow and stern thruster was established. And the motion simulation of USV maneuvering was carried out through the numerical simulation calculation. Then the berthing plan was designed basedon the maneuverability analysis of the USV low-speed motion, and the simulation of automatic berthing for USV was carried out. The research results of this paper can be of certain practical significance for the USV based on the support of the bow and stern thruster in the berthing. At the same time, it also provides a certain theoretical reference for the handling of the USV automatic berthing.
Journal of Marine Science, Volume 3; doi:10.30564/jms.v3i2.3063
Located in northern South China Sea, Chaoshan Depression is mainly a residual Mesozoic depression, with a construction of Meso-Cenozoic strata over 7000m thick and good hydrocarbon accumulation conditions. Amplitude attribute of -90°phase component derived by phase decomposition is employed to detect Hydrocarbon in the zone of interest (ZOI) in Chaoshan Depression. And it is found that there are evident amplitude anomalies occurring around ZOI. Phase decomposition is applied to forward modeling results of the ZOI, and high amplitudes occur on the -90°phase component more or less when ZOI is charged with hydrocarbon, which shows that the amplitude abnormality in ZOI is probably caused by oil and gas accumulation.
Journal of Marine Science, Volume 3; doi:10.30564/jms.v3i2.3126
The ocean wave climate has a variety of applications in Naval defence. However, a long-term and reliable wave climate for the Indian Seas (The Arabian Sea and The Bay of Bengal) over a desired grid resolution could not be established so far due to several constraints. In this study, an attempt was made for the simulation of wave climate for the Indian Seas using the third-generation wave model (3g-WAM) developed by WAMDI group. The 3g-WAM as such was implemented at NPOL for research applications. The specific importance of this investigation was that, the model utilized a “mean climatic year of winds” estimated using historical wind measurements following statistical and probabilistic approaches as the winds which were considered for this purpose were widely scattered in space and time. Model computations were carried out only for the deep waters with current refraction. The gridded outputs of various wave parameters were stored at each grid point and the spectral outputs were stored at selected locations. Monthly, seasonal and annual distributions of significant wave parameters were obtained by post-processing some of the model outputs. A qualitative validation of simulated wave height and period parameters were also carried out by comparing with the observed data. The study revealed that the results of the wave climate simulation were quite promising and they can be utilized for various operational and ocean engineering applications. Therefore, this study will be a useful reference/demonstration for conducting such experiments in the areas where wind as well as wave measurements are insufficient.
Journal of Marine Science, Volume 3; doi:10.30564/jms.v3i2.2741
The Banda Sea is one of the routes of global ocean currents that move from the Pacific Ocean to the Indian Ocean. This flow is known as Indonesian Through Flow (ITF). The Banda Sea is an area where warm and cold water masses meet, so it has the potential for a thermal front. This study aims to understand the variability of thermal front in the Banda Sea during the El Nino Southern Oscillation period. Southern Oscillation Index (SOI) and sea surface temperature (SST) data in 2010, 2012 and 2015 were used in this study. SOI data was obtained from http://www.bom.gov.au and SST data was obtained from http://oceancolor.gsfc.nasa.gov. The data were processed using ArcGIS 10.4 software and Ms. Office 2013. The results showed the La Nina period occurs in July - December 2010, the Normal period occurs in July - December 2012, and the El Nino period occurs in May - October 2015. In general, during La Nina, the mean SST has higher values than the other periods. On the other hand, the highest thermal front occurs during the El Niño period (10584), followed by the Normal period (7544) and the lowest during the La Niña period (5961), respectively.
Journal of Marine Science, Volume 3; doi:10.30564/jms.v3i1.2599
Based on the perspective of marine tourism, this paper integrates various types of marine pollution, and puts forward high-quality development solutions and future extension direction of marine tourism. Through the research, it is found that the main culprits of marine pollution mainly include the following seven points: human activities produce garbage; white pollution; ship pollution; exploration of marine oil and gas resources and mineral pollution; land reclamation; pollution in mariculture industry and new estrogen pollution. The causes of marine pollution and countermeasures are discussed.
Journal of Marine Science, Volume 3; doi:10.30564/jms.v3i1.2552
Having as target the semi-enclosed basin of the Black Sea, the main purpose of the present paper is to provide an overview of its general physical features and circulation patterns. In order to achieve this goal, more than five decades of data analysis – from 1960 to 2015 – were taken into consideration and the results were checked against known data, both from satellite data over the last two decades and in-situ measurements from earlier decades. The circulation of the Black Sea basin has been studied for almost 400 years, since the Italian Count Luigi Marsigli first described the ‘two layer’ circulation through the Bosphorus Strait in the year 1681. Since climate change projections for the Black Sea region foresee significant impact on the environment in the coming decades, a set of adaptation and mitigation measures is required, therefore more research is needed. Nowadays, the warming trend adds a sense of immediate urgency because according to the National Oceanic and Atmospheric Administration’s National Centre for Environmental Information, July 2020 was the second-hottest month ever recorded for the planet. Its averaged land and ocean surface temperature tied with July 2016 as the second-highest for the month in the 141-year NOAA’s global temperature dataset record, which dates back to 1880. It was 0.92°C above the 20th-century average of 15.8°C, with only 0.01°C less than the record extreme value measured in July of 2019.
Journal of Marine Science, Volume 3; doi:10.30564/jms.v3i1.2622
Red tides are a major public hazard in the global oceans. The coast of the East China Sea is the sea area where red tide disasters are the most frequent and serious in China. In order to accurately grasp the occurrence of red tides in the coastal waters of the East China Sea, and to understand the microbial communities in the waters during the occurrence of red tides in the East China Sea, a special survey of red tides in the coastal waters of Zhejiang, China was carried out in June 2018. The results showed that nutrient concentrations of N and P were generally high in this area, DIN concentrations in most areas exceeded the permitted limit of Chinese seawater quality grade I. There were significant differences in dissolved oxygen, pH, COD, chlorophyll and phytoplankton abundance of red tides. During the investigation, red tides were found in the waters near the Yushan Islands. The content of chlorophyll a was 42.12mg/m3, the cell abundance of phytoplankton was 8.16×108/L, and the abundance of Prorocentrum edulis accounted for 98.5%. The Illumina MiSeq sequencing platform was used for 16s high-throughput sequencing of water microorganisms, and a total of 16 bacteria were identified. Proteobacteria is the first dominant phylum, followed by Cyanobacteria and Bacteroides. Some differences in bacterial community compositions between HAB and the nearby seawater were observed. The predominant bacteria in the red tide occurrence area were Proteobacteria, comprising 46.1% of the relative abundance; while the predominant bacteria in the nearby sea area, comprising 42.0% of the relative abundance.
Journal of Marine Science, Volume 3; doi:10.30564/jms.v3i1.2506
Based on the incompressible RANS equation, the KVLCC1 ship's resistance field's numerical simulation is carried out. In this paper, the bare hull (calm water resistance and wave resistance) and hull-propeller-rudder models are studied and compared with the values of the Hydrostatic resistance test. In the hull-propeller-rudder system's performance analysis, the body force method is used to replace the real propeller model. The new calculation domain is set for the hull-propeller-rudder system model and meshed again to obtain the highly reliable numerical simulation results. Finally, the calculation results are analyzed. The research results in this paper can provide technical support for the resistance of similar ship types.
Journal of Marine Science, Volume 3; doi:10.30564/jms.v3i1.2416
Conus loroisii is a marine vermivorous snail found profusely in the southern seas of India. They harbor several toxic peptide components commonly called as ‘conotoxins’. In this study, we have identified and sequenced five conotoxins using proteome based tandem mass spectrometry analysis through Data analysis 4.1 software. Among them, we found Lo959 as contryphan which is previously described. All other conotoxins Lo1702, Lo1410, Lo1385 and Lo1686 belong to M-Superfamily conotoxins and novel to C. loroisii. Lo1410 is completely novel to conotoxin research with 3 disulfides and the amino acid sequence is derived as CCSTNCAVCIPCCP. All the identified M-Superfamily conotoxins are sub categorised to mini M2 superfamily conotoxins. Lo1702 and Lo1686 possess C- terminal amidation which is the key feature in conotoxins. Moreover, we have screened the natural venom for the occurrence of toxicity in the zebrafish model and brine shrimp.