Sustainable Marine Structures

Journal Information
EISSN : 2661-3158
Published by: Nan Yang Academy of Sciences Pte Ltd (10.36956)
Total articles ≅ 31
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Liang-Cheng Liu, Ge Wang, Jun-Yi Song, Bi-Ru Hu
Sustainable Marine Structures, Volume 4, pp 29-34; https://doi.org/10.36956/sms.v4i1.438

Abstract:
Resolving the contradiction between Marine economic development and Marine ecological environment protection has become an unavoidable and sharp problem. The uncontrolled use of Marine antifouling technology will bring uncontrollable and even irreversible damage to the Marine biosphere, which will lead to ecological disaster and threaten the survival of human beings. Therefore, it is an urgent task to find antifouling technology with lower environmental toxicity under the premise of considering economy. More attention should be paid to the long-term impact of mature and new technologies on the Marine ecological environment. This paper introduces the development status of antifouling technology, its influence on Marine ecological environment and puts forward the design strategy of comprehensive biological fouling prevention and control technology.
Zhang ChunLing, Zhang Meng-Li, Wang Zhen-Feng, Hu Song, Wang Dan-Yang, Yang Sheng-Long
Sustainable Marine Structures, Volume 4, pp 1-12; https://doi.org/10.36956/sms.v4i1.474

Abstract:
Argo has become an important constituent of the global ocean observation system. However, due to the lack of sea surface measurements from most Argo profiles, the application of Argo data is still limited. In this study, a thermocline model was constructed based on three key thermocline parameters, i.e, thermocline upper depth, the thermocline bottom depth, and thermocline temperature gradient. Following the model, we estimated the sea surface temperature of Argo profiles by providing the relationship between sea surface and subsurface temperature. We tested the effectiveness of our proposed model using statistical analysis and by comparing the sea surface temperature with the results obtained from traditional methods and in situ observations in the Pacific Ocean. The root mean square errors of results obtained from thermocline model were found to be significantly reduced compared to the extrapolation results and satellite retrieved temperature results. The correlation coefficient between the estimation result and in situ observation was 0.967. Argo surface temperature, estimated by the thermocline model, has been theoretically proved to be reliable. Thus, our model generates theoretically feasible data present the mesoscale phenomenon in more detail. Overall, this study compensates for the lack surface observation of Argo, and provides a new tool to establish complete Argo data sets.
B. K. Chakraborty, Verma A. K., S. Muniya
Sustainable Marine Structures, Volume 3; https://doi.org/10.36956/sms.v3i2.436

Abstract:
Bangladesh is very rich in aquatic fauna with a biodiversity. The present study, conducted during 2015 to 2019, recorded a total number of 131 spe cies (104 fish, 09 prawn, 01 snail, 04 crabs, and 13 turtles) belonging to 26 families were identified from the Mogra River and its flood plain. About ten types of fishing gears, different crafts, hook and line were found oper ative in the river. Increasing rates of using current jal (16.0-26.40%) and Kapuri jal (11.0-16.70%) were identified as detrimental gears destroyingdifferent species. The fish productivity was decreased dramatically from 170.63±10.81mt to 134.75±8.02 mt with a decreasing percentage of 6.26 to 21.03% within five years. Three important aquatic species turtiles (Cyclemys oldhami, Melanocheelys trjuuga and Morenia petersi) became rare and 17 commercially important aquatic species were at the edge of extinction (critically endangered, CR). From the study, 67 species were recorded inthe endangered (EN) category, 20 species vulnerable status (VU), 11 species lower risk (LR), 07 species Least concern (LC) and 04 Data deficient (DF). To save the existing aquatic species in the studied riverine ecosystem and ensure better livelihood of the fishes, a team of local management committee, similar to the Hilsa fisheries management technology is needed.
Abdelaziz Mounir, Mohammed Znari, Hayat Elmghazl, Hassan Alahyane, Noreddine Chouikh, Nawal Hichami
Sustainable Marine Structures, Volume 3; https://doi.org/10.36956/sms.v3i2.433

Abstract:
This article summarizes the state of stocks of sardine, sardina pilchardus in Moroccan waters at the end of 2016 and 2018. These stocks varies according to the region,They are now in a sustainable exploitation situation:Atlantic sardine, but also stocks that have reached or are still in over-exploitation levels: Mediterranean sardine. The fi shing pressure exerted on the sardine stock exceeds the optimal level by 40%. Due to the degradation of the fragile marine environment of the Mediterranean region, generated by pollution of various origins, the overexploitation of juveniles in the coastal strip, non-responsible practices and the use of non-fi shing gearselective, it is imperative to take the necessary measures to protect the marine environment and ensure rational and sustainable exploitation of the resource. (High commission plan 2006 report).
O.A. Adeboyejo, E.O. Clarke, A.M. Hammed, O.O. Whenu, J.P. Abayomi, O.M. Olarewaju
Sustainable Marine Structures, Volume 3; https://doi.org/10.36956/sms.v3i2.434

Abstract:
A study on seasonal abundance, morphometric and meristic data, growth pattern, condition factor, sex ratio and gonadosomatic index of Liza falcipinnis (Valenciennes, 1836) from the Ojo axis of Badagry creek, Nigeria was conducted from May 2019 to March 2020. A total of 1012 species were randomly selected, having 499 females and 513 males. The length frequency analysis and length-weight relationships (LWR) were determined. Sex ratio was determined by Chi-square analysis. The results showed that morphometric data are: 0.5 - 2.5 mm for ED, 2.1 - 12 mm for HL, 1.7 - 8.1 mm for HD, 2.5 - 11.7 for BD, 2.6 - 233.3 mm for TL and 9.23 - 1006 g for BW for the combined sexes. The slope (b) shows an allometric growth pattern. The intercept ‘a’ and slope ‘b’ of the LWR (LogW = a + bLogL) were Log W=15.39+ 0.34 LogL (r= 0.54) for combined sexes, Log W= 12.49+ 0.02 log L (r= 0.38) for males and Log W= 18.23+ 0.01 log L (r=0.16) for females.The length frequency distribution indicated that species were dominated by two year classes (Ages 1 and 2). Condition factors were generally low. The values ranged between 0.68 - 0.85 for combined sexes. The gonadosomatic index for female was highest in August, 2019 (17.77%) with Mean±SD of 2.88±0.75; which indicated the peak of spawning period in the study area.Sex ratio difference was significant (P<0.05). Sexual differences were significant; the females are phenotypically larger than the male.
Liana De Figueiredo Mendes, Patrícia Pinheiro Beck Eichler, Tatiana Leite, Ana Beatriz Alves Bennemann, Clara De Souza Melo, Andressa Lima Ferreira, Khalil Bow Ltaif Garcia, Luzia Liniane Do Nascimento Silva, Christofer Paul Barker, Helenice Vital, et al.
Sustainable Marine Structures, Volume 3; https://doi.org/10.36956/sms.v3i2.431

Abstract:
In 2019, an oil spill in Brazil, of unknown origin, severely impacted coastal environs with the worst environmental disaster ever recorded in any tropical coastal region globally severely damaging South Pirangi Reef area in the state of Rio Grande do Norte (RN). Here we discuss acute and chronic impacts including chemical contamination and economic consequences all over the world and show some evidence of the oil spill in this biodiverse area. Moreover, the lapse between the moment of the disaster, and the action to manage it, was hampered by a political agenda coinciding with local and global tragedies that redirected public attention. Meanwhile almost 2 years have passed still without the offending party identification or culpability; and poor communities may continue to absorb its deleterious impacts for decades without consideration or compensation. This disaster occurred during the Brazilian government’s current issues involving extensive environmental mismanagement, resulting in a slow response from an inept system. It is with urgent necessity to spotlight this tragedy in this unique and sensitive reef habitat experiencing the ongoing damaging effects that include socio-economic losses not yet addressed.
Luis Felipe Avilés-Ramírez, Joanna M. Ortiz-Alcantara, Ma. Leticia Arena-Ortiz
Sustainable Marine Structures, Volume 3; https://doi.org/10.36956/sms.v3i2.432

Abstract:
Plastic pollution has become an urgent issue, since its invasion to every ecosystem has led to multiple impacts on the environment and human populations. Certain microbial strains and genera had shown the ability to biodegrade plastic sources under laboratory conditions. In this minireview, we collect and analyze scientific papers and reports of this microbial activity as we contextualize this information on the global plastic pollution problem, to provide an updated state of the art of plastic biodegradation with microbial agents. Along with a broad understanding of the general process of plastic biodegradation hosted by microorganisms. The contributions of this minireview come from the identification of research gaps, as well as proposals for new approaches. One of the main proposals focuses on coastal environments and in particular coastal wetlands as a great microbiome source with potential for plastic biodegradation, whether reported or undiscovered. Our final proposal consists of the application of this knowledge into technologic tools and strategies that have a remarkable impact on the battle against the plastic pollution problem.
Do Duc Luu, Cao Duc Hanh, Nguyen Xuan Tru
Sustainable Marine Structures, Volume 2, pp 35-38; https://doi.org/10.36956/sms.v2i2.330

Abstract:
Vector of diagnostic signs (VDS) using torsional vibration (TV) signal on the main propulsion plant (MPP) is the vector of z maxima (or minima) values of the TV signal in accordance with the cylinder firing orders. The technical states of the main diesel engine (MDE) include R= z+1 classes and are presented in z-dimensional space coordinate of VDS. The presentation of Dk, k=1÷R using z diagnostic signs (Vi, i=1÷z) is nonfigurative and quite complicated. This paper aims to develop a new method for converting VDS from z-dimensional to 2-dimensional space (two-axes) based on working angle of a cylinder. The new vector of diagnostic signs VN is constructed as the geometrical grand total of all VDS:, where; ; and. The proposed model is useful for presenting a technical state Dk in two-dimensional space (x, y) in a visualization way. The algorithm and simulation software are designed for the DME 6S46-MCC, installed on the motor vessel (MV) 34000DWT. The R technical state classes are drawn separately and visually in the Descartes. The received results are valuable to improve smart diagnostic system for analyzing normal/misfire states of cylinders in operation regimes
Karim Akbari
Sustainable Marine Structures, Volume 2; https://doi.org/10.36956/sms.v2i2.329

Abstract:
On one hand, the diversity of activities and on the other hand, the conflictions between beneficiaries necessitate the efficient management and supervision of coastal areas. Accordingly, monitoring and evaluation of such areas can be considered as a critical factor in the national development and directorship of the sources. With regard to this fact, remote sourcing technologies with use of analytical operations of geographic information systems (GIS), will be remarkably advantageous. Iran’s south-eastern Makran coasts are geopolitically and economically, of importance due to their strategic characteristics but have been neglected and their development and transit infrastructure are significantly beyond the international standards. Therefore, in this paper, with regard to the importance of developing Makran coasts, a Multi-Criterion Decision Analysis (MCDA) method was applied to identify and prioritize the intended criteria and parameters of zoning, in order to establish new maritime zones. The major scope of this study is to employ the satellite data, remote sensing methods, and regional statistics obtained from Jask synoptic station and investigate the region’s status in terms of topography, rainfall rate and temperature changes to reach to a comprehensive monitoring and zoning of the coastal line and to provide a pervasive local data base via use of GIS and MCDA, which will be implemented to construct the coastal regions
N.K Owhonda
Sustainable Marine Structures, Volume 2; https://doi.org/10.36956/sms.v2i2.301

Abstract:
The edible flesh of guinean tilapia (Tilapia guineensis), blackchin tilapia (Sarotherondon melanotheron) and mullet (Liza falcipinnis) were collected from Choba river for elemental studies of cadmium, mercury, arsenic, lead, nickel and speciated forms of elements using X-ray fluorescence (XRF) and Gas chromatography-mass spectrometer (GC-MS) respectively. The highest concentration of cadmium (4.3mg/kg) was observed in Sarotherodon melanotheron. They all contained about the same concentration of arsenic (0.5mg/kg) and mercury (1mg/kg). The highest concentration of lead was detected in mullet (1.7mg/kg) while the highest concentration of nickel (7.3mg/kg) was detected in Sarotherodon melanotheron. The organometallic compounds detected were nickel tetracarbonyl, borane carbonyl in Tilapia guineensis, nickel tetracarbonyl, borane carbonyl and germanium(iv) pthalocyanine dichloride in Sarotherodon melanotheron and [µ-(ƞ6-benzene)]bis(ƞ5-2,4-cyclopentadien-yl)di-µ-hydrodi-vanadium and borane carbonyl in mullet
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