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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Marine Environment & Energy
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Journal DOI :
The Korean Society for Marine Environmental Engineering
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Volume & Issues
Volume 19, Issue 3 - Aug 2016
Volume 19, Issue 2 - May 2016
Volume 19, Issue 1 - Feb 2016
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Distribution of Nutrients and Chlorophyll α in the Surface Water of the East Sea
Yoon, Sang Chol ; Yoon, Yi Yong ;
Journal of the Korean Society for Marine Environment & Energy, volume 19, issue 2, 2016, Pages 87~98
DOI : 10.7846/JKOSMEE.2016.19.2.87
During the period between July 3 and 27 of 2009, water samples were collected from the Russian coast at a depth of 30m from 26 stations (including Ulleung and Japan basins) onboard the Russian survey vessel R/V Lavrentyev following 4 lines (D, R, E, and A). The samples were analyzed for nutrients and chlorophyll a contents. All parameters exhibited higher values in warm waters than in cold waters (
, and chlorophyll-
:1.9-fold), except nitrates, which was 1.4-fold higher in cold waters than in warm waters. The horizontal distribution of ammonia, phosphate, and chlorophyll-
was very similar to each other and showed the highest values in the waters near Russia, where a upwelling influence of cold current and bottom water prevails, while relatively low distribution was observed at the Ulleung Basin. On the other hand, nitrates showed the highest concentration at the Ulleung Basin, which is under the direct influence of the Tsushima warm water, and showed a gradual decrease northward. The N/P ratio showed the highest value in the Tsushima middle water, rather than in the North Korean Cold Water, the Tsushima Warm Water was the primary source of nitrate flow into the East Sea. However, the average concentration of phosphate in the warm waters was <
, thereby limiting phytoplankton growth, while a high concentration of phosphate in cold waters showed a direct correlation with chlorophyll-
. The results of principal component analysis for the identification of primary factors that influence the marine environment showed that principal component I was water temperature and principal component II was influenced chlorophyll-
and nutrients. Therefore, Study area has greatest influenced by water temperature, and clearly distinct cold and warm water regions were observed in the East Sea.
Numerical Investigation on Oil Spill from Damaged Riser
Kim, Hyo Ju ; Lee, Sang Chul ; Park, Sunho ;
Journal of the Korean Society for Marine Environment & Energy, volume 19, issue 2, 2016, Pages 99~110
DOI : 10.7846/JKOSMEE.2016.19.2.99
When a riser is damaged, the oil spills to sea. Oil spills cause huge economic losses as well as a destruction of the marine environment. To reduce losses, it is needed to predict spilled oil volume from risers and the excursion of the oil. The present paper simulated the oil spill for a damaged riser using open source libraries, called Open-FOAM. To verify numerical methods, jet flow and Rayleigh-Taylor instability were simulated. The oil spill was simulated for various damaged leak size, spilled oil volume rates, damaged vertical locations of a riser, and current speeds. From results, the maximum excursion of the spilled oil at the certain time was predicted, and a forecasting model for various parameters was suggested.
Feasibility Study on the Gas-Liquid Multiphase by Lattice-Boltzmann Method in Two-Dimensions
Jung, Rho-Taek ;
Journal of the Korean Society for Marine Environment & Energy, volume 19, issue 2, 2016, Pages 111~119
DOI : 10.7846/JKOSMEE.2016.19.2.111
Gas-Liquid multiphase flow simulation has been carried out using the Lattice boltzmann method. For the interface treatment, pseudo-potential model (Shan-Chen) was used with the Carnahan-Starling equation of state. Exact Difference Method also applied for the treatment of the force term. Through the developed code, we simulated coexsitence structure of high and low density, phase separation, surface tension effect, characteristics of moving interface, homogeneous and heterogeneous cavitation and bubble collaps.
Vector Control for Wave Power Generation System using Permanent Magnet Linear Synchronous Generator
Park, Joon Sung ; Hyon, Byong Jo ; Yun, Junbo ; Lee, Ju ; Choi, Jang-Young ; Choi, Jong-Su ; Hong, Keyyong ;
Journal of the Korean Society for Marine Environment & Energy, volume 19, issue 2, 2016, Pages 120~128
DOI : 10.7846/JKOSMEE.2016.19.2.120
This paper describes power generation from sea waves by using linear permanent magnet generator. A buoy is placed on the ocean surface and connected to the generator. The wave energy is carried out from the movement of a buoy. An electrical conversion system is needed between the generator and the grid. For an analysis of the power system, the modeling of the linear generator and converter system was proceeded. This paper proposes vector control method for wave power generation system using linear generator. In order to verify the proposed method, simulation and experiment performed and the results support the validity of the control scheme.
Transient Effects of Wind-wave Hybrid Platform in Mooring Line Broken Condition
Bae, Yoon Hyeok ; Lee, Hyebin ;
Journal of the Korean Society for Marine Environment & Energy, volume 19, issue 2, 2016, Pages 129~136
DOI : 10.7846/JKOSMEE.2016.19.2.129
Floating offshore structures keep its position by a mooring system against various kind of environmental loadings. For this reason, a reliable design of the mooring system is a key factor for initial design stage of a floating structure. However, there exists possibility of mooring failure, even the system is designed with enough safety margin, due to the unexpected extreme environmental conditions or long-term fatigue loadings. The breaking of one of the mooring lines may change the tension level of the other mooring lines, which can potentially result in a progressive failure of the entire structure. In this study, time domain numerical simulation of 10MW class wind-wave hybrid platform was carried out with partially broken mooring line. Overall platform responses and variations of the mooring line tension were numerically evaluated.
Survey of Sedimentary Environment and Sediment at the West-Northern Site of Chagwi-do nearby Jeju Island
Kim, Hansoo ; Hyeon, Jong-Wu ; Jin, Changzhu ; Kim, Jeongrok ; Cho, Il-Hyoung ;
Journal of the Korean Society for Marine Environment & Energy, volume 19, issue 2, 2016, Pages 137~143
DOI : 10.7846/JKOSMEE.2016.19.2.137
The sedimentary environment and sediment were surveyed at the West-Northern site of Chagwi-do nearby Jeju Island for the design of the embedded suction anchor system of 10 MW-class floating wave-offshore wind hybrid power generation system. According to the classification scheme of Chough et al., the echo type of the seismic profiles using the chirp III was classified. As a results, the center and west-northern area of survey site were proved to be type I-3 where subbottom layer with thickness 5~15 m exists under the flat seafloor. On the other hands, the east-southern area were regarded to be type I-1, I-2 and III-1 where seafloor reflection is much stronger than type I-3. Also, the physical tests (unit weight, moisture content, grain size, liquid limit, specific gravity) were performed with samples taken from 8 fixed locations. It is found that the sand (SP), the sand blended with silt (SM) and the mixture of SP-SM are distributed uniformly on the survey area.
Spatio-Temporal Distribution of Particulate Organic Carbon (POC) and Nitrogen (PON) in the Southwestern Area of East Sea
Oh, Seok Jin ; Jeong, Semi ; Kim, Seok-Yun ;
Journal of the Korean Society for Marine Environment & Energy, volume 19, issue 2, 2016, Pages 144~150
DOI : 10.7846/JKOSMEE.2016.19.2.144
In southwestern East Sea, we investigated the spatio-temporal distribution characteristics of particulate organic carbon (POC) and nitrogen (PON) in September 2011 (summer), January (winter) and May 2012 (spring). Although cold waters known as the origin upwelling in the surface layer of September were not observed, this periods showed high primary productivity because of high concentrations of chlorophyll, low percentage of non-autotrophic particulate fraction among POC calculated by POC/Chl-a ratio (27%) and low POC/PON ratio (6.2), which means active amino acid and protein synthesis, However, May, 2012 showed low primary productivity because of high percentage of non-autotrophic particulate fractions among POC (66%) and high POC/PON ratio (8.1), Although spring bloom and high primary productivity has been reported in the East Sea, high percentage of non-autotrophic particulate fractions in POC, observed in the East sea during the post 2012 spring, is suggested to be due to the increase of phaeo-pigment during post spring bloom. Thus, composition of particulate organic matter may have sensitively changed by marine environmental factors in spite of same season.
Study on Performance Variation According to the Arrangements of Adjacent Vertical-Axis Turbines for Tidal Current Energy Conversion
Lee, Jeong-Ki ; Hyun, Beom-Soo ;
Journal of the Korean Society for Marine Environment & Energy, volume 19, issue 2, 2016, Pages 151~158
DOI : 10.7846/JKOSMEE.2016.19.2.151
Tidal farm is a multi-arrayed turbine system for utilizing tidal stream energy. For horizontal-axis turbine(HAT) system, it is recommended that each unit has to be deployed far apart in order to avoid hydrodynamic interference among turbines, as proposed by the European Marine Energy Centre(EMEC). But there is no rule for the arrangement of vertical-axis turbine(VAT) yet. Moreover it has been reported that a proper arrangement of adjacent turbines can enhance the overall efficiency even greater than an arrangement without mutual interference effect. This paper suggests the layout of VATs showing the better performances, which turned out to be quite different from HATs' arrangement. Numerical calculations were performed to investigate the performance variation in terms of the rotational direction as well as the distance between turbines. It has been shown that the best combination of rotational direction and distance between turbines can increase its performance higher about 9.2% than that of two independently operated turbines. It is likely that such improvement is due to the increased velocity between adjacent turbines. For diagonally arranged turbines, the maximum normalized mean power coefficient was obtained to be higher about 5.6% than that of two independent turbines. It is expected that the present results can be utilized for conceptual design of tidal farm to harness the tidal stream energy.
Development of Prediction Program of Added Resistance Due to Waves at the Towing Condition of a Disabled Ship Using ISO 15016 Analysis Method
Choi, Hyuek-Jin ; Kim, Eun-Chan ; Lee, Seung-Guk ;
Journal of the Korean Society for Marine Environment & Energy, volume 19, issue 2, 2016, Pages 159~164
DOI : 10.7846/JKOSMEE.2016.19.2.159
It is one of the important processes to predict the resistance of the towed ship when towing a disabled ship on the sea. Besides the basic resistance of hull itself, there are various added resistance, especially the added resistance due to waves can be considered one of the biggest component. In this paper, the algorithm which predict the added resistance due to waves of a disabled ship by theoretical analysis method of ISO 15016 standard was established, and realized as a computer program. The calculated result for an example ship was compared with existing standard one, and it is considered that this algorithm and computer program are appropriate to use for predicting the resistance and towing force of the disabled ship actually.
A Study on R&D Performance Analysis of Marine Technology
Choi, Sang Sun ; Oh, Inha ; Lee, Dongmyeng ;
Journal of the Korean Society for Marine Environment & Energy, volume 19, issue 2, 2016, Pages 165~171
DOI : 10.7846/JKOSMEE.2016.19.2.165
In this study, the characterization of projects and analysis of R&D products and commercialization performances were done to serve some implications on the policy decisions related to the commercialization of R&D in marine and fisheries sector. A total of 212 R&D projects with 144 ones for marine and 68 for fisheries performed for 5 years, from 2010 to 2014, were sorted and analyzed on the respect of government budget, main performing body, and research period. The R&D result and commercialization performance were substituted to quantitative indicators, such as the number of published papers, the number of patents, the amount of the technology royalty, the number of technology transfers, and the improvement of public service, which were subjects to be analysed. Based on the results, this study suggests the policy implications for the success of national R&D program; 1) diversifying the main performing body, 2) operating the system for sharing research infrastructures among researchers, 3) introducing the adaptable R&D program management, 4) expending the portion of grants without detailed requests for proposal, and 5) leaning the investigation of R&D budgets on projects focusing on the practicalization and commercialization.