Journal of Marine Science and Technology最新文献

{"title":"Simulation of turbulent effective wakes for propellers in off-design conditions by a correction factor approach.","authors":"Antonio Sánchez-Caja, Jussi Martio, Ville M Viitanen, Timo Siikonen","doi":"10.1007/s00773-020-00794-7","DOIUrl":"10.1007/s00773-020-00794-7","url":null,"abstract":"<p><p>This paper presents a procedure for the estimation of propeller effective wakes in oblique flows. It shows how a recently developed method for controlling coupling errors can be applied to analyze propellers operating in off-design conditions. The approach allows the use of fast potential flow methods for the representation of the propeller in the context of viscous flow solvers and works accurately for a wide range of advance numbers and incidence angles with a minimum computational cost. The new method makes it possible to disclose flow phenomena on the effective wake that were hidden in conventional approaches of effective wake simulation. Different application cases are analyzed, such as a propeller-shaft configuration in inclined flow, a pod propulsor in an oblique inflow, and a ship hull advancing at a yaw angle. A dipole-like distortion on the effective wake is unmasked for a uniform flow incident to a propeller mounted on an inclined shaft. The flow component perpendicular to the axis is found to be responsible for the distortion. The effect of the direction of propeller rotation on the effective wake is illustrated for a single-shaft ship moving at a yaw angle. In particular, keel vortices are either attracted to or repelled from the propeller disk depending on the sign of the yaw angle or alternatively on that of the propeller rotation.</p>","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"26 4","pages":"1014-1025"},"PeriodicalIF":2.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7813973/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38853165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Journal of Marine Science: An Open Framework Dedicated to the Presentation of the Discoveries and Insights in Marine Science Research","authors":"E. Rusu","doi":"10.30564/jms.v3i3.3511","DOIUrl":"https://doi.org/10.30564/jms.v3i3.3511","url":null,"abstract":"Marine environment represents a very important and actual topic. Water bodies cover more than two thirds of the earth’s surface and even after thousands of years, scientists have yet to fully uncover their mysteries. At the same time climate, change has visible effects with a growing dynamics in the last decades and the marine environment is very sensitive to these changes. In order to mitigate the effects of the climate change there is an increasing need of reducing the CO2 emissions and from this perspective the marine environment represents an important source of clean renewable energy. In this respect, the Journal of Marine Science represented even from the beginning an open framework dedicated to the presentation of the discoveries and insights in marine science research.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"54 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91211637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogeological and Hydrochemical Characterization of Coastal aquifers with Special reference to Submarine Groundwater Discharge in Uttara kannada, Karnataka, India","authors":"B. Purandara, Sudhir Kumar, N. Varadarajan, Sumit Kant, J. Tyagi","doi":"10.30564/jms.v3i3.3476","DOIUrl":"https://doi.org/10.30564/jms.v3i3.3476","url":null,"abstract":"Submarine groundwater discharges to the coastal ecosystems have been recognised as a source of dissolved chemical substances that cause chemical and ecological effects on sea waters. Groundwater, in many coastal areas, becomes contaminated or at least enriched with a variety of chemical substances and can have higher concentrations of dissolved solids than river water. As a result SGD makes a larger contribution to the flux of dissolved chemical compounds than river run-off. Therefore, the present investigation has been carried out to understand the process of submarine groundwater discharge based on hydrological, hydrogeological and hydrochemical components. Accordingly water balance components were evaluated based on hydrological and hydrogeological investigations. Hydrochemical parameters were also evaluated to understand the impact of seawater intrusion during both pre-monsoon and post-monsoon seasons of 2019. Study revealed that, there are signatures of considerable quantity of submarine groundwater discharge in parts of Honnavara, Kumta, Ankola and Karwar talukas. The influence of seawater in coastal aquifers is quite rare all along the coast of Uttara kannada district which is attributed to high groundwater recharge(15-20%) occurring in catchment areas.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"18 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81034981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Overview of Oligocene to Recent Sediments of the Western Pacific Warm Pool (WPWP) (International Ocean Discovery Program-IODP Exp. 363) Using Warm and Cool Foraminiferal Species","authors":"Patrícia Pinheiro Beck Eichler, Christofer Paul Barker, M. Gomes, H. Vital","doi":"10.30564/jms.v3i3.3516","DOIUrl":"https://doi.org/10.30564/jms.v3i3.3516","url":null,"abstract":"We use the excellent sediment recovery of International Ocean Discovery Program (IODP) Exp. 363, in the Western Pacific Warm Pool (WPWP) to assess down-core variations in the abundance of warm versus cool benthic foraminiferal species through a warm benthic foraminifers (WBF) curve. The total percentage of the “warm” shallower species group (Laticarinina pauperata, Cibicidoides kullenbergi, C. robertsonianus, Cibicidoides sp., Hoeglundina elegans, and Bulimina aculeata) and of the “cool” species group from deep waters (Pyrgo murrhina, Planulina wuellerstorfi, Uvigerina peregrina, and Globobulimina hoeglundi, Hopkinsina pacifica) at all sites is used to assess paleo temporal and spatial variations in preservation and marine temperature. Our study sites span water depths ranging from 875 m to 3421 m and our results indicate that well-preserved living and fossil foraminifera characterize mudline and core sediments at all water depths attesting the wide environmental tolerance of these species to temperature and pressure. Using magneto-and biostratigraphy datum, these sediments are of Oligocene age. Our low-resolution study showed that with the exception of core 1486B which the linear tendency of warmer species is toward cool sediments in old times, all of them show that older sediments indicate warmer periods than today, which is expected from Miocene to Recent. Our results provide evidence for the preservation potential of deeply buried sediments, which has implications on climate reconstructions based on the population dynamics of calcareous benthic foraminifera.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"41 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79200162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reproductive Biology of Splendid Ponyfish Leiognathus splendens (Cuvier, 1829) in Myeik Coastal Waters, Myanmar","authors":"K. Maung, Phan Minh-Thu, N. Tun","doi":"10.30564/jmsr.v1i2.923","DOIUrl":"https://doi.org/10.30564/jmsr.v1i2.923","url":null,"abstract":"Reproductive biology of Leiognathus splendens was studied by using the samples collected from the catches of trawl fisheries in Myeik coastal waters during January to December 2014. Spawning takes place throughout the year, with a peak during April-May and September-December. The observed length at first maturity was 9.0 cm total length in males and 8.4 cm in females. The mean gonadosomatic index was more prominently in females (2.5) than males (1.5). Sex ratio (1 male: 1.1 females) also indicates the general dominant of females over males  Fecundity varied from 6120 to 58412 eggs. Relationship of fecundity to fish length, fish weight and ovary weight showed that fecundity is more related to the gonad weight (r=0.9) than length (r=0.8) and weight of fish (r=0.7)","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"23 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72986994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated Coastal Management Dynamic Models: A Case Study of Development Seaweed Cultivation in the Waters Luwu and Palopo Regency Bone Bay, South Sulawesi","authors":"Walu Yo, Yonvit Ner, E. Riani, Dan Taslim Arifin","doi":"10.30564/jmsr.v1i2.990","DOIUrl":"https://doi.org/10.30564/jmsr.v1i2.990","url":null,"abstract":"Waters carrying capacity in seaweed of Eucheuma cottonii cultures should be a concernforoptimum seaweed culture. Carryingcapacity can determine by Ecological Footprint (EF) analysis, which in this research usefootprint production, and mas balance nitrate analysis. This research on Mei 2015 (1sttransitionalseason) and September 2015 (2ndtransitionalseason) in Luwu and Palopo, South Sulawesi. Map and land use analyzed with  geographic information systems (GIS).The results showed that theEcological Footprint production (EFP)in Luwu waters is 67,88 ton/capita/year, or equivalent to 235.823,93 tons/year.Based on the analysis of the availability of water for seaweed is 38.374,69 hectares, it can produce seaweed (biocapacity) for 922.928,96 tons/year and  the number of farmers that allows for use the waters is  13.595 capita. The Ecological Footprint  production (EFp) in Palopo waters is 3,08 ton/capita/year, or equivalent to 4.589,99 tons/year. Water availability analysis is 979,82 hectares are able to produce seaweed (biocapacity) for10.115,34 ton/year and the number of farmers that allows for use the waters is 3.276 capita. Based on the four scenario simulation management results of the development seaweed cultivation Eucheumacottonii in Luwu and PalopoRegency is based on the present waste input, pressing inputs of waste into the waters of 10%, 25% and 50% yield different waters biocapacity. The results comparison between biocapacity and Ecological Footprint, ecological status for  Luwu and Palopo waters are still in sustainable use.Based on those simulation results showed that in second scenario by pressing the waste input by 10% from the existing waste input, as well as assuming the availability of water utilizing the entire area of 38.374,69 hectares continuously (on the years scale of 2008-2030), it will produce the highest biocapacity waters in the amount of 8.257.274,94 tons/year. So with the management of seaweed in Palopo with second scenario, assuming the availability of water utilizing the entire area of 979,82 hectares will produce the highest waters biocapacity of 14.306,92 tons/year.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"33 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79345240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Managing Tidal Inlets","authors":"J. A. French","doi":"10.30564/jmsr.v1i2.850","DOIUrl":"https://doi.org/10.30564/jmsr.v1i2.850","url":null,"abstract":"Sandy inlets are in a dynamic equilibrium between wave-driven littoral drift acting to close them, and tidal flows keeping them open. Their beds are in a continual state of suspension and deposition, so their bathymetry and even location are always in flux. Even so, a nearly linear relationship between an inlet’s cross-sectional flow area and the inshore tidal prism is maintained - except when major wind and/or runoff events act to close or widen an inlet. Inlet location can be stabilized by jetties, but dredging may still be necessary to maintain a navigable channel. Armoring with rock large enough to resist erosion can protect an inlet bed or river mouth from excessive storm flow erosion.  Armoring can also be used as a stratagem to close inlets.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"28 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84417398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydro-environmental Characteristics of Seawater around Boubyan Island, Kuwait Using Annual Variations of Seawater Temperature, Salinity and Tide Fluctuations","authors":"Neelamani Subramaniam, Y. Al-Osairi","doi":"10.30564/jmsr.v1i2.1000","DOIUrl":"https://doi.org/10.30564/jmsr.v1i2.1000","url":null,"abstract":"The temporal and spatial variations of seawater temperature, salinity, and tidal fluctuations are important parameters for understanding the hydrodynamic, water quality, and marine biological activity in the seawater. It is also important to study and understand the probability and statistical aspects of these parameters for the planning and implementation of different types of marine projects. These parameters were measured at five different locations around Boubyan Island, Kuwait, for a span of almost one year during 2015-16. Based on the analysis of the measured data, it is found that the seawater salinity has varied from 34.14 to 48.31 ppt. The seawater temperature is also found to vary from 10.83 oC to 35.67 oC.  The seawater level has varied from -2.694 m to 2.378 m with respect to the mean sea level. It is found that the peak of the probability density of seawater level is flat valued, whereas the probability density of salinity and seawater temperature is multimodal.  A comparison of present and past measured seawater temperatures revealed that in Khor Al-Sabiya, the seawater temperature is increasing at the rate of 0.034 oC/year, which clearly indicates the effect of global warming. A similar study reveals that the annual average increase in salinity at Khor Al-Sabiya is 0.38 ppt, which clearly indicates a significant reduction of freshwater flow from Shatt Al-Arab into the Arabian Gulf.  Since Kuwait is investing in many projects around the Boubyan Island, the results of this study will be useful for the integrated and sustainable development of Boubyan and Failaka Islands in Kuwait.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"90 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90035842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation and Research Analysis of Marine Ecological Suitability","authors":"Hongdan Liu, Xinfei Jin, Weifei Wu, C. Shen","doi":"10.30564/jmsr.v1i2.1206","DOIUrl":"https://doi.org/10.30564/jmsr.v1i2.1206","url":null,"abstract":"Whether in the past, present and future, marine ecological environment is the most important part in the history of human development, we can call it the \"patron saint\" of mankind. It provides all kinds of resources and energy needed for social production, and plays an irreplaceable role in species diversity and ecological balance. However, the weakening of self-purification ability of marine ecosystem, the decline of pollution purification ability, the deterioration of marine ecological environment, and the decline of biological resources and biodiversity ,etc. all these bring fatal impact to coastal areas and even the whole terrestrial ecosystem, it is imminent to strengthen ecological protection. It is our bounden duty to protect the living environment of human. We have the right to enjoy the convenience brought by the natural environment, so we should fulfill the obligation to protect it.[Chinese Library Classification Number]   X31        [Document Code]  A","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"39 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75158485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Baseline Survey on Coral Diseases, Stress Factors and New Threats in Coral Reefs of Gulf of Mannar Marine Biosphere, India","authors":"R. Chatragadda, K. Sadhukhan, Shunmugaraj T, Murthy M.V.R.","doi":"10.30564/JMS.V1I1.835","DOIUrl":"https://doi.org/10.30564/JMS.V1I1.835","url":null,"abstract":"Gulf of Mannar Marine Biosphere Reserve (GOMMBRE) is the first marine biosphere reserve in India and Southeast Asia. It has a rich marine biodiversity including coral reefs, but now facing threats from different environmental factors and anthropogenic interferences. Particularly, coral reefs distributed in the 21 islands under the Gulf of Mannar (GoM) region are facing critical threats. Although several institutions and authors have studied various aspects on corals, direct and indirect influences of natural and anthropogenic catastrophes on corals have been poorly understood. Therefore, the main objective of this study was to identify the anthropogenic disturbances, biological stress factors and diseases on fringing reefs of GoM. The present study reveals that dead coral reefs are being replaced by assemblage of marine algae. Although several diseases were recorded during this study, pink line disease is wide spread in all the islands. Porites sp. and Acropora sp. were the more affected corals. This baseline data lays foundations to survey and to assess the rapid changes that occur over a period of time in coral reefs of GoM.","PeriodicalId":16334,"journal":{"name":"Journal of Marine Science and Technology","volume":"19 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74092852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}