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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 16, Issue 4 - Nov 2013
Volume 16, Issue 3 - Aug 2013
Volume 16, Issue 2 - May 2013
Volume 16, Issue 1 - Feb 2013
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Hydrodynamic Aspects on Three-dimensional Effects of Vertical-axis Tidal Stream Turbine
Hyun, B.S. ; Lee, J.K. ;
Journal of the Korean Society for Marine Environment & Energy, volume 16, issue 2, 2013, Pages 61~70
DOI : 10.7846/JKOSMEE.2013.16.2.61
Hydrodynamic aspects on three-dimensional effects were investigated in this study for simple and convenient conversion of tidal stream energy using a Vertical-Axis Turbine (VAT). Numerical approach was made to reveal the differences of flow physics between 2-D estimation and rigorous 3-D simulation. It was shown that the 3-D effects were dominant mainly due to the variation of tip vortices around the tip region of rotor blade, causing the loss of lift for steadily translating hydrofoil and the reduction of torque for rotating turbine blade. The 3-D effect was found to be rather prominent for the typical VATs considered in this paper. Simple and yet efficient 2-D approach with the correction of its three-dimensionality was also proposed for practical design and analysis of VAT.
Vertical Profiles and Assessment of Trace Metals in Sediment Cores From Outer Sea of Lake Shihwa, Korea
Ra, Kongtae ; Kim, Joung-Keun ; Kim, Eun-Soo ; Kim, Kyung-Tae ; Lee, Jung-Moo ; Kim, Eu-Yeol ;
Journal of the Korean Society for Marine Environment & Energy, volume 16, issue 2, 2013, Pages 71~81
DOI : 10.7846/JKOSMEE.2013.16.2.71
Trace metal concentration in sediment cores from the outer sea of Lake Shihwa were determined to study the vertical profiles of metal concentrations and to evaluate the levels of metal contamination. Sediment pollution assessment was carried out using enrichment factor (EF) and geo-accumulation index (Igeo). The mean concentration of metals were 58.8 mg/kg for Cr, 10.3 mg/kg for Co, 22.8 mg/kg for Ni, 18.1 mg/kg for Cu, 74.0 mg/kg for Zn, 6.75 mg/kg for As, 0.14 mg/kg for Cd, 27.4 mg/kg for Pb and 0.026 mg/kg for Hg, respectively. The mean EF values for Cu, Zn, As, Cd and Hg were greater than 1.5 in sediment cores, indicating that these metals in sediments are slightly enriched by anthropogenic activities. The geo-accumulation index (Igeo) suggested unpolluted status for metals of sediments collected from outer see of Lake Shihwa. Igeo values for Cu and Hg nearby LNG station (site C, D, E) ranged from 1 to 2, indicating moderately to unpolluted pollution status for those metals. Even if the higher concentrations of trace metals nearby LNG station were observed, there is significantly positive relationship between Al and trace metals. Thus, the sediment grain size plays an important roles in influencing the distribution of trace metals in sediment cores from the outer sea of Lake Shihwa. Based on the comparison with sediment quality guidelines such as threshold effect level and probable effect level in Korea, the concentration of metals in sediments from outer sea of Lake Shihwa are likely to result in no harmful effects on sediment-dwelling organisms.
Anti-fouling Property of Hydrophobic Surfaces in Sea Water
Cho, S.H. ; Ryu, S.N. ; Hwang, W.B. ; Yoon, B.S. ;
Journal of the Korean Society for Marine Environment & Energy, volume 16, issue 2, 2013, Pages 82~87
DOI : 10.7846/JKOSMEE.2013.16.2.82
Effects of material surface property, hydrophobic or hydrophilic, on the bio-fouling occurred on the bodies submerged in the sea water are investigated experimentally. 4 test models are used in the experiment, which includes aluminum foil in common use, AAO applied hydrophobic surface, HDFS coated hydrophobic surface and hydrophilic surface. Hydrophobic surfaces with numerous micro & nano-scale pillars on it seems to play very important role of preventing them from fouling in initial stage while the effects disappear in long term sense of fouling process. It is concluded that the surface hydrophobicity retards the initial fouling until the fouling thickness is smaller than the heights of the pillars on it but the effects diminish with the fouling proceeds so that the thickness grows bigger than the pillar heights.
The Study on the Marine Eco-toxicity and Ecological Risk of Treated Discharge Water from Ballast Water Management System Using Electrolysis
Shon, M.B. ; Son, M.H. ; Lee, J. ; Son, Y.J. ; Lee, G.H. ; Moon, C.H. ; Kim, Y.S. ;
Journal of the Korean Society for Marine Environment & Energy, volume 16, issue 2, 2013, Pages 88~101
DOI : 10.7846/JKOSMEE.2013.16.2.88
The International Convention for the Control and Management of Ship's Ballast Water and Sediments was adopted at 2004 and then various BWMS (ballast water management system) have been developed. In this study, WET (whole effluent toxicity) test with algae (diatom) Skeletonema costatum as primary producer, invertebrate (rotifera) Brachionus plicatilis as 1st consumer and fish (olive flounder) Paralichthys olivaceus as predator, chemical analysis and ERA (environmental risk assessment) were conducted to assess the unacceptable effect on marine ecosystem by emitting the discharge water treated with AquaStar
BWMS using electrolysis as main treatment equipment for removing the marine organisms in the ship's ballast water. The most sensitive test organism on discharge water treated with AquaStar
BWMS was S. costatum that gave the NOEC value of 25.00%, LOEC value of 50.00% and 72hr-
value of 69.97% from WET test result for 20 psu salinity treated discharge water. NOEC and LOEC value of B. plicatilis and P. olivaceus exposed at 20 psu salinity treated discharge water were 50.00% and 100.00%, respectively. In the chemical analysis results, total number of substances produced by AquaStar
BWMS was 18 which were bromate, 7 volatile halogenated organic compounds, 7 halogenated acetic acids, 3 halogenated acetonitriles and chloropicrin. Eighteen substances did not consider as persistence and bioaccumulative chemicals. Uncertainty of toxic property of 18 substances was high. PECs of 18 substances calculated by MAMPEC model were ranged from
, PNECs of them were ranged from
. And, the PEC/PNEC ratio of 18 substances did not exceed 1. Therefore, ERA for produced substances indicate that the discharge water treated with AquaStar
BWMS does not pose unacceptable effect on marine life. And
value of S. costatum on discharge water treated by BWMS using the electrolysis had positive correlation with initial TRO concentration, concentration and kind & level of HAAs.
Evaluation of Spatial and Temporal Variations of Water Quality in Lake Shihwa and Outer Sea by Using Water Quality Index in Korea: A Case Study of Influence of Tidal Power Plant Operation
Ra, Kongtae ; Kim, Joung-Keun ; Kim, Eun-Soo ; Kim, Kyung-Tae ; Lee, Jung-Moo ; Kim, Sung-Keun ; Kim, Eu-Yeol ; Lee, Seung-Yong ; Park, Eun-Ju ;
Journal of the Korean Society for Marine Environment & Energy, volume 16, issue 2, 2013, Pages 102~114
DOI : 10.7846/JKOSMEE.2013.16.2.102
The basin of Lake Shihwa is one of highly industrialized region of Korea and a current environmental issue of study area is the operation of tidal power plant (TPP) to improve water quality. The application of water quality index (WQI) which integrates five physiochemical parameters (transparency, DO, DIN, DIP and chlorophyll-a) of water quality in Lake Shihwa and outer sea during 2011~2012 were performed not only to evaluate the spatial and temporal distribution of the water quality but also to assess the effect of water quality improvement by the operation of tidal power plant. The higher WQI values were observed in monitored sites near the industrial complexes in Lake Shihwa and the outfall of wastewater treatment plants (WWTPs) in outer sea. This indicates that the quality of seawater is influenced by diffuse non-point sources from industrial, municipal and agricultural areas in Lake Shihwa and by point sources from the effluence of municipal and industrial wastewater throughout WWTPs in outer sea. Mean WQI value decreased from 53.0 in 2011 to 42.8 in 2012 of Lake Shihwa. Water quality has improved significantly after TPP operation because enhancement of seawater exchange between Lake Shihwa and outer sea leads to improve a hypoxic condition which is primarily a problem in Lake Shihwa. Mean WQI of outer sea showed similar values between 2011 and 2012. However, the results of hierarchical cluster analysis and the deterioration of water quality in summer season indicate that the operation of tidal power plant was not improved the water quality in the upper most area of Lake Shihwa. To successfully improve overall water quality of Lake Shihwa, it is urgently necessary to manage and reduce of non-point pollution sources of the basin of Lake Shihwa.
Removal Characteristics of Mixed Heavy Metals from Aqueous Solution by Recycled Aggregate as Construction Waste
Shin, Woo-Seok ; Kim, Young-Kee ;
Journal of the Korean Society for Marine Environment & Energy, volume 16, issue 2, 2013, Pages 115~120
DOI : 10.7846/JKOSMEE.2013.16.2.115
This study examined the removal rate of mixed heavy metals from aqueous solution using recycled aggregate. The recycled aggregate is favorable for the absorbent because it contains about 95% (CaO,
), which are major ingredient of adsorbent for heavy metal. The kinetic data presented that the slow course of adsorption follows the Pseudo first and second order models. The equilibrium data were well fitted by the Langmuir model and showed the affinity order:
. The results also showed that adsorption rate slightly increased with increasing pH from 6 to 10. Moreover, this trend is similar to results obtained as function of loading amount of recycled aggregate. Meanwhile, an unit adsorption rate was slightly decreased. From these results, it was concluded that the absorbents can be successfully used the removal of the heavy metals from the aqueous solutions.
Improvements of Post-Project Environmental Management for the System of the Sea Area Utilization Consultation
Kim, Gui-Young ; Lee, Dae-In ; Eom, Ki-Hyuk ; Jeon, Kyeong-Am ; Kang, Sung-Kyung ;
Journal of the Korean Society for Marine Environment & Energy, volume 16, issue 2, 2013, Pages 121~129
DOI : 10.7846/JKOSMEE.2013.16.2.121
This study investigated the status and problems of the post-project environmental management for development projects and suggested improvements of the system to achieve effectiveness for the system of the sea area utilization consultation. The post-project environmental management has had several problems such as the neglect of implementations and checks for the consultation items, the lack of actions and notifications of results, the absence of awareness and expertise of the post-project environmental management. In addition, although it is very important to verify results of actual change and modelling of marine environment before and after the projects, the marine environmental monitoring and assessment have been perfunctorily carried out. Thus, for the improvements of the post-project environmental management to the system of the sea area utilization consultation, it is extremely necessary for related stakeholders to raise awareness of the post management and implement it faithfully, and establish the post management system for conflict resolution and enforce sanctions and accountability against executory items. Furthermore, it should establish systematic monitoring system of marine environmental impact survey.
Automatic Mesh Generation Method on The Offshore Wind Tower
Kim, Namhyeong ; Kang, Hyunjin ;
Journal of the Korean Society for Marine Environment & Energy, volume 16, issue 2, 2013, Pages 130~137
DOI : 10.7846/JKOSMEE.2013.16.2.130
The more accurate numerical analysis is needed, The more important to arrange nodes and elements properly on the structures wanted to be analyzed. In this study, automatic mesh generation method is developed for triangular mesh modeling in wind tower and substructure formed in circular sections especially, which have structural and economical benefits in shallow water area. It can consider variety conditions by inputting the detail data such as height and types. Also, this study includes the comparison and verification with the mesh generation by Delaunay triangular technique on 3 dimensional space and the examples of mesh generation for proposed tower and substructure. The result of this study will be widely applied to analyze the existing and proposed models for wind turbines.
Bio-Monitoring System Using Shell Valve Movements of Pacific Oyster (Crassostrea gigas) -I. Detecting Abnormal Shell Valve Movements Under Low Salinity Using a Hall Element Sensor
Oh, Seok Jin ; Lee, Jun-Ho ; Kim, Seok-Yun ;
Journal of the Korean Society for Marine Environment & Energy, volume 16, issue 2, 2013, Pages 138~142
DOI : 10.7846/JKOSMEE.2013.16.2.138
As an early warning system to reduce the damage of aquacultured mollusks due to low salinity water, we investigated the possibility of a biomonitoring system measuring the shell valve movement (SVM) of Pacific oyster (Crassostrea gigas) by using the Hall element sensor. In high salinity water of 27 psu, SVMs of Pacific oyster showed spikes which mean a relatively fast closing condition after opened condition of average 10-15 mm, and then the SVM showed back to opening condition slower than closing speed. In water salinity of 20-27 psu, the SVMs were similar to that of 27 psu. However, below 17 psu, it showed abnormal valve movements such as spending more time for shell closure. In 10 psu, we could not detected SVMs due to closed condition during experiment periods. Thus, if we quickly detect abnormal environmental variations like low salinity using bio-monitoring of SVM, it may be contribute to increased productivity by dramatically reducing damages in aquaculture.
The Honolulu Strategy and Its Implication to Marine Debris Management in Korea
Hong, Sunwook ; Lee, Jongmyoung ; Jang, Yong-Chang ; Kang, Daeseok ; Shim, Won Joon ; Lee, Jongsu ;
Journal of the Korean Society for Marine Environment & Energy, volume 16, issue 2, 2013, Pages 143~150
DOI : 10.7846/JKOSMEE.2013.16.2.143
The Honolulu Strategy is a framework document to address marine debris issue globally. The Fifth International Marine Debris Conference held in March 2011 and organized by NOAA and UNEP catalyzed the development of the Holonulu Strategy. Goals of the Strategy are to reduce the amount and impact of land-based, sea-based, and accumulated marine debris. A set of strategies for each goal were provided for education and awareness, legislation, and alternative technologies. The Strategy also lists indicators that could be used to evaluate outcomes of strategies. The adoption of the Honolulu Strategy by the international community has led the international organizations such as GPA, IMO, and CBD to strengthen their responses to the marine debris issue. UN has also set up specific actions that will be implemented until 2025 through its resolutions on marine debris. Recent global developments related to the marine debris issue might lead to a change in the character of the international marine debris management from the current soft law regime to a mandatory one. The Honolulu Strategy could provide a guideline when the Korean government formulates the Second Basic Plan for Marine Debris Management, especially with its prevention-oriented approaches, utilization of scientific policy development tools, and adoption of evaluation system using performance indicators.