Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society for Marine Environment & Energy
Journal Basic Information
Journal DOI :
The Korean Society for Marine Environmental Engineering
Editor in Chief :
Volume & Issues
Volume 18, Issue 4 - Nov 2015
Volume 18, Issue 3 - Aug 2015
Volume 18, Issue 2 - May 2015
Volume 18, Issue 1 - Feb 2015
Selecting the target year
Pollution and Ecological Risk Assessment of Trace Metals in Surface Sediments of the Ulsan-Onsan Coast
Sun, Chul-In ; Kim, Dong-Jae ; Lee, Yong-Woo ; Kim, Seong-Soo ;
Journal of the Korean Society for Marine Environment & Energy, volume 18, issue 4, 2015, Pages 245~253
DOI : 10.7846/JKOSMEE.2015.18.4.245
Total acid digestion and 1 M HCl extraction methods were used to investigate the pollution status and the degree of ecological risk of trace metals in surface sediments from the Ulsan-Onsan coast. Total concentrations of trace metals (Cu, Cd, Pb, Zn, and Hg) were two-fold higher in surface sediments from Onsan coast than in those from Ulsan coast. The mean labile fractions of the total concentrations of Cd and Pb were 72% and 78%, respectively, indicating a high contribution from anthropogenic sources, whereas Cr, Li, Ni, and As in the residual fraction exceeded 80%, indicating a high contribution from natural sources. According to the results of assessment of trace metal pollution using the sediment quality guidelines in Korea, the concentrations of Cu, Pb, Zn, and Hg were higher than the values of the probable effects level (PEL) at some stations of Onsan coast, and the concentrations of Cr and Ni were lower than the values of the threshold effects level (TEL). The pollution level and ecological risk of the trace metals were analyzed using various indexes (EF,
, m-PEL-Q, and ERI). Our results showed that the degree of pollution by trace metals (Cu, Cd, Pb, Zn, and Hg) on the Ulsan-Onsan coast was high, and Hg and Cd were the major potential ecological risk factors.
Numerical Study on Shape Optimization of a Heaving Hemisphere Wave Energy Converter
Kim, Sung-Jae ; Koo, Weoncheol ; Heo, Kyung-Uk ; Heo, Sanghwan ;
Journal of the Korean Society for Marine Environment & Energy, volume 18, issue 4, 2015, Pages 254~262
DOI : 10.7846/JKOSMEE.2015.18.4.254
Parametric study on submerged body shape of an oscillating hemisphere point absorber was conducted to predict the optimal relation between radius and draft of the body. As an additional damping due to power takeoff system, the optimal damping same as wave radiation damping was applied to the PTO system to produce the maximum wave power. Body response spectrum and power spectrum were obtained for various peak frequencies on wave spectra. It was found that the maximum power can be generated when the peak frequency of available wave power was 20% greater than that of wave spectrum.
Estimating the Global Inflow and Stock of Plastic Marine Debris Using Material Flow Analysis: a Preliminary Approach
Jang, Yong Chang ; Lee, Jongmyoung ; Hong, Sunwook ; Choi, Hyun Woo ; Shim, Won Joon ; Hong, Su Yeon ;
Journal of the Korean Society for Marine Environment & Energy, volume 18, issue 4, 2015, Pages 263~273
DOI : 10.7846/JKOSMEE.2015.18.4.263
We estimated the global inflow and stock of plastic marine debris. In South Korea, we estimated that the annual inflow of plastic marine debris (72,956 tons) was about 1.4% of annual plastics consumption (5.2 million tons) in 2012. By applying this 1.4% ratio to global plastics production from 1950 to 2013, we estimated that 4.2 million tons of plastic debris entered the ocean in 2013 and that there is a stock of 86 million tons of plastic marine debris as of the end of 2013, assuming zero outflow. In addition, with a logistic model, if 4% of petroleum is turned into plastics, the final stock of plastic marine debris shall be 199 million tons at the end. As the inflow and the stock are different units of measurement, better indicators to assess the effectiveness of inflow-reducing policies are needed. And, as the pollution from plastic marine debris is almost irreversible, countermeasures to prevent it should be valued more, and stronger preventive measures should be taken under the precautionary principle. As this is a preliminary study based on limited information, further research is needed to clarify the tendency of inflow and stock of plastic marine debris.
Study on Performance of Vertical-axis Tidal Turbines Applied to the Discharged Channel of Power Plant
Lee, Jeong-Ki ; Hyun, Beom-Soo ;
Journal of the Korean Society for Marine Environment & Energy, volume 18, issue 4, 2015, Pages 274~281
DOI : 10.7846/JKOSMEE.2015.18.4.274
Thermal and nuclear power plants on shore commonly use the sea water for cooling facility. Discharged cooling water has the high kinematic energy potential due to amount of water flux. Numerical analysis was made to find the suitable combinations between the arrangement of tidal turbines and the overall dimensions of the discharged channel. Several parameters such as the turbine diameter to inlet size, and the axial distance to turbine size were investigated. Power coefficients for various test conditions were also compared to see the effect of inlet configurations such as single inlet and dual inlet. For the single inlet, the mean power coefficient appeared to be gradually decreased with increasing distance, and the maximum power was obtained when the turbine diameter was same as the inlet diameter. For the dual inlet, the tendency was similar so that the better result when the turbine diameter was same as the inlet diameter. It is expected that the present methodology can be extensively utilized to harness the high kinetic energy flow of the discharge channel of power plant.
Latching Control Technology for Improvement of Extracted Power from Wave Energy Converter
Cho, Il Hyoung ;
Journal of the Korean Society for Marine Environment & Energy, volume 18, issue 4, 2015, Pages 282~290
DOI : 10.7846/JKOSMEE.2015.18.4.282
In this study, a latching control technology, proposed by Sheng et al.(2015), was applied in order to maximize the extraction efficiency of WEC (Wave Energy Converter), which is the heaving buoy coupled with linear electric generator. The latching control is the phase-control technique for improving the wave energy conversion with appropriate latching duration of keeping the buoy fixed. From the time-domain analysis in regular waves, the latching control technology can significantly improve the heave velocity and extracted power, even though the resonance condition is not satisfied. By using the latching control technology, the draft of buoy as well as the required PTO damping force can be significantly reduced along with increased extracted power, which is a big advantage in manufacturing the WEC.
Latching Control Strategy for Improvement Wave Energy Conversion in Irregular Waves
Cho, Il Hyoung ; Kim, Jeong Rok ; Kim, Kyong-Hwan ; Hong, Keyyong ;
Journal of the Korean Society for Marine Environment & Energy, volume 18, issue 4, 2015, Pages 291~297
DOI : 10.7846/JKOSMEE.2015.18.4.291
The wave spectrum was generated from wave data measured at the Chagwi-do site in Jeju, where a 10MW class floating wave-offshore wind hybrid power generation system will be installed. The latching control technology (Sheng et al.) was applied in order to improve the extracted power from WEC (Wave Energy Converter), which is heaving in corresponding irregular waves. The peak period as a representative value of irregular waves was used when we determined the latching duration. From the numerical results in the time-domain analysis, the latching control technology can significantly improve the extracted power about 50%.
Development of Resistance Prediction Method for the Effect of Drifting Angle at the Towing Operation of a Disabled Ship
Kim, Eun-Chan ; Choi, Hyuek-Jin ; Lee, Seung-Guk ;
Journal of the Korean Society for Marine Environment & Energy, volume 18, issue 4, 2015, Pages 298~303
DOI : 10.7846/JKOSMEE.2015.18.4.298
When a disabled ship is being towed in a seaway, the resistance increase of the towed ship caused by both the external conditions such as wave and wind and the hull conditions such as drifting angle, should be accurately predicted. Most of the disabled ships cannot be towed in the front direction of hull, but they are usually towed in drifted direction with some drifting angle. In this sense, the resistance increase caused by the drifting angle is not an element to be ignored. In this paper, various methods for prediction of the resistance increase caused by the drifting angle are studied. In addition, new prediction methods such as front-lateral projected ratio method and empirical formula method by multiple regression analysis have been derived. The front-lateral projected area ratio method has been applied to a computer program for prediction of the towing condition, and this method has been approved to be a useful method in practical situations.
Oil Fluorescence Spectrum Analysis for the Design of Fluorimeter
Oh, Sangwoo ; Seo, Dongmin ; Ann, Kiyoung ; Kim, Jaewoo ; Lee, Moonjin ; Chun, Taebyung ; Seo, Sungkyu ;
Journal of the Korean Society for Marine Environment & Energy, volume 18, issue 4, 2015, Pages 304~309
DOI : 10.7846/JKOSMEE.2015.18.4.304
To evaluate the degree of contamination caused by oil spill accident in the sea, the in-situ sensors which are based on the scientific method are needed in the real site. The sensors which are based on the fluorescence detection theory can provide the useful data, such as the concentration of oil. However these kinds of sensors commonly are composed of the ultraviolet (UV) light source such as UV mercury lamp, the multiple excitation/emission filters and the optical sensor which is mainly photomultiplier tube (PMT) type. Therefore, the size of the total sensing platform is large not suitable to be handled in the oil spill field and also the total price of it is extremely expensive. To overcome these drawbacks, we designed the fluorimeter for the oil spill detection which has compact size and cost effectiveness. Before the detail design process, we conducted the experiments to measure the excitation and emission spectrum of oils using five different kinds of crude oils and three different kinds of processed oils. And the fluorescence spectrometer were used to analyze the excitation and emission spectrum of oil samples. We have compared the spectrum results and drawn the each common spectrum regions of excitation and emission. In the experiments, we can see that the average gap between maximum excitation and emission peak wavelengths is near 50 nm for the every case. In the experiment which were fixed by the excitation wavelength of 365 nm and 405 nm, we can find out that the intensity of emission was weaker than that of 280 nm and 325 nm. So, if the light sources having the wavelength of 365 nm or 405 nm are used in the design process of fluorimeter, the optical sensor needs to have the sensitivity which can cover the weak light intensity. Through the results which were derived by the experiment, we can define the important factors which can be useful to select the effective wavelengths of light source, photo detector and filters.
The Intertidal Area in Lake Sihwa After Operation of the Tidal Power Plant
Kim, Minkyu ; Koo, Bon Joo ;
Journal of the Korean Society for Marine Environment & Energy, volume 18, issue 4, 2015, Pages 310~316
DOI : 10.7846/JKOSMEE.2015.18.4.310
The intertidal area in Lake Sihwa formed after operation of Sihwa-Lake tidal power plant and the change of the area in Lake Sihwa by period were analyzed. For computation of the intertidal area, remote sensing techniques were applied and high resolution Digital Elevation Model (DEM) was generated with root mean square (rms) error 14.4 cm. The intertidal area was
in 1991 before completion of Sihwa dyke,
in 2010 during the period on operation of sluice gate, and
in 2013 after operation of Sihwa tidal power plant. Intertidal in Lake Sihwa was nearly dissipated after completion of Sihwa dyke, but significantly increased with operation of Sihwa tidal power plant from April 2012 as developing a regular tide environment and increasing of sea water flux. The re-formation of tidal flat of Sihwa Lake is an uncommon case. This study that precisely analyzed on the area of artificially formed Sihwa tidal flat would be applicable for management and making conservation plan.