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 17, Issue 4 - Nov 2014
Volume 17, Issue 3 - Aug 2014
Volume 17, Issue 2 - May 2014
Volume 17, Issue 1 - Feb 2014
Selecting the target year
Geometry Design of a Pitch Controlling Type Horizontal Axis Turbine and Comparison of Power Coefficients
Park, Hoon Cheol ; Truong, Quang-Tri ; Phan, Le-Quang ; Ko, Jin Hwan ; Lee, Kwang-Soo ; Le, Tuyen Quang ; Kang, Taesam ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 3, 2014, Pages 167~173
DOI : 10.7846/JKOSMEE.2014.17.3.167
In this work, based on the blade element-momentum theory (BEMT), we proposed the geometry of a lab-scale horizontal axis tidal turbine with a diameter of 80cm, which can demonstrate the maximum power coefficient, and investigated the effect of blade pitch angle increase on the power coefficient. For validation of the computed power coefficients by the BEMT, we also computed the power coefficient using the computational fluid dynamics (CFD) for each case. For the CFD, 15 times of the turbine radius was used for the length and diameter of the computational domain, and the open boundary condition was prescribed at the boundary of the computational domain. The maximum power coefficients of the turbine acquired by the BEMT and CFD were about 48%, showing a good agreement. Both of the power coefficients computed by the BEMT and CFD tended to decrease when the blade pitch angle increases. The two power coefficients for a given tip-speed ratio were in good agreement. Through the present study, we have confirmed that we can trust the proposed geometry and the computed power coefficients based on the BEMT.
Design of Wave Energy Extractor with a Linear Electric Generator -Part II. Linear Generator
Cho, Il Hyoung ; Choi, Jang Young ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 3, 2014, Pages 174~181
DOI : 10.7846/JKOSMEE.2014.17.3.174
Design procedure of LEG(Linear Electric Generator) is introduced by performing the time-domain analysis for the heaving motion of a floating buoy coupled with LEG. A vertical truncated buoy is selected as a point absorber and a double-sided Halbach array mover and cored slotless stator is adopted as a linear electric generator. LEG with a double-sided Halbach array mover and cored slotless stator is designed with the input data such as the heave motion velocity and wave exciting forces in time-domain. The validity of designed LEG is confirmed by performing generating-characteristic-analysis under the sinusoidal motion of a buoy, based on the numerical techniques such as FE(Finite Element) analysis. In particular, an ECM(Equivalent Circuit Method) is employed as the design tool for the prediction of generating characteristics under irregular wave conditions. Finally, we confirm that the ECM gives reasonable and fast results without sacrifice of accuracy.
Performance of Oscillating Water Column type Wave Energy Converter in Oblique Waves
Jin, Jiyuan ; Hyun, Beom-Soo ; Hong, Keyyong ; Liu, Zhen ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 3, 2014, Pages 182~188
DOI : 10.7846/JKOSMEE.2014.17.3.182
In an oscillating water column (OWC)-type wave energy conversion system, the performance of the OWC chamber depends on the chamber shape, as well as the incident wave direction and pressure drop produced by the turbine. Although the previous studies on OWC chambers have focused on wave absorbing performance in ideal operating conditions, incident waves do not always arrive normally to the OWC chamber in real sea conditions, especially in fixed devices. The present study deals with experiments and numerical calculations to investigate the effects of wave direction on the performance of the OWC chamber. The experiments were carried out in a three-dimensional wave basin for five different wave directions, including the effect of turbine using the corresponding orifice. The wave elevation inside the chamber was measured at the center point under various incident wave conditions. The numerical study was conducted by using a numerical wave tank-based volume-of-fluid model to compare the results with experimental data and to reveal the detailed flows around the chamber.
Establishment of Integrated Information System for Ballast Water Management
Kim, Eun-Chan ; Oh, Jeong-Hwan ; Lee, Seung-Guk ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 3, 2014, Pages 189~197
DOI : 10.7846/JKOSMEE.2014.17.3.189
Collection and management of various information related to the ballast water are the essential components for the efficient implementation of the IMO Ballast Water Management Convention. Based upon the ballast water risk assessment and information system developed by other states, regions or even at global level, an integrated information system has been established to be applied to our domestic ports. The integrated information system is composed of four DataBases (DB) which are the Shipping DB, Ballast water DB, Port Environment DB and Species DB. The Shipping DB has been established based on the data collected from the Port Management Information System (Port-MIS). For the Ballast water DB, Ballast water has only been estimated by the loading/unloading of the cargoes as the convention has not come into effect yet. The Port Environment DB and Species DB are being established based on the reference documents and existing and newly collected monitoring data. From these DB, the integrated information system will be able to provide a base for the information search, statistic analysis and risk assessment of ballast water. Once the convention comes into effect, this integrated information system will be applied to manage the domestic ballast water discharge and also the port management.
A Study on the Simplified Prediction Method of Air Resistance for Towing Force Calculation of Disabled Ships
Kim, Eun-Chan ; Choi, Hyuek-Jin ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 3, 2014, Pages 198~204
DOI : 10.7846/JKOSMEE.2014.17.3.198
Ships sailing the seas encounter air resistance. The air resistance depends on the shape of the above-water hull, the ship speed, the wind speed and wind direction. The experimental or statistical methods which are used to predict the air resistance are one of the essential procedures of the calculation of the towing force of the disabled ships. This paper shows simplified air resistance prediction method using the variables of the projected area of the above-water hull, the speed of the ship, the wind speed and its direction. These methods have been applied to the existing computer program which had been set up to predict the towing force of the disabled ships.
Numerical Study of Pre-swirl Stator for Model and Full Scales
Park, Sunho ; Oh, Gwangho ; Rhee, Shin Hyung ; Koo, Bon-Yong ; Lee, Hoseong ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 3, 2014, Pages 205~211
DOI : 10.7846/JKOSMEE.2014.17.3.205
Interests on energy saving devices (ESDs) have been increased with the concern of the energy efficiency design index (EEDI) developed by the international maritime organization (IMO). To study the influence of ESDs, KVLCC2 with energy saving pre-swirl stator (PSS) was selected. To validate the computations, computed nominal wake of the model scale ship was compared with the experimental data, and the numerical uncertainty assessment was done for the full scale ship computations. The PSS changed rotational flow, which was assistant to the propeller thrust for the model and full scale ships. Performances of the full scale ships were predicted by ITTC methods, and new prediction method was proposed.
The Long-Term Variations of Water Quality in Masan Bay, South Sea of Korea
Kwon, Jung-No ; Lim, Jae-Hyun ; Shim, Jeonghee ; Lee, Jangho ; Choi, Tae-Jun ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 3, 2014, Pages 212~223
DOI : 10.7846/JKOSMEE.2014.17.3.212
For the better understanding of long-term and seasonal variations of water quality in Masan Bay, South Sea of Korea, we analyzed the archive data monitored at three stations of the bay during the last 13 years (2000-2012). The average concentrations of the chemical oxygen demand (COD), the dissolved inorganic nitrogen (DIN) and the dissolved inorganic phosphorus (DIP) during the monitoring period are
in surface water, respectively, and
in bottom water, respectively. The trophic state of the surface water was the eutrophic level in Masan Bay during the four seasons. The DIN concentrations of both surface and bottom waters increased from August to November and showed the highest average in November. However, The DIN decreased from February to May and showed the lowest average in May. The concentrations of the DIP and the dissolved silicate (DSi) in bottom waters had the highest averages in August because of the high water temperature and oxygen deficient condition. The results of correlation analysis and factor analysis showed that the main factors of surface waters were inflow of nutrients from terrestrial areas and internal production, and the main factors of bottom waters were the variations of the dissolved oxygen (DO), the DIP, and the DSi. The DIN and DIP average concentrations (2007~2012) had decreased in range of 68.1%~76.0% and 66.2~76.6%, respectively from 2007 in which the "Regulation of Total Emission" was established in Masan Bay. Therefore, it could have had positive effects on water quality improvement to take the "Regulation of Total Emission" and other actions such as reducing water pollutions in Masan Bay from 2007.
Interaction between Coastal Debris and Vegetation Zone Line at a Natural Beach
Yoon, Han Sam ; Yoo, Chang Ill ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 3, 2014, Pages 224~235
DOI : 10.7846/JKOSMEE.2014.17.3.224
Changes in the interactions among incident ocean water waves, coastal debris (marine debris), and the back vegetation zone line on a natural sandy beach on the island of Jinu-do in the Nakdong river estuary were investigated. The study involved a cross-sectional field survey of the beach, numerical modeling of incident ocean water waves, field observations of the distribution of coastal debris, and vegetation zone line tracking using GPS. The conclusions of this study can be summarized as follows: (1) The ground level of the swash zone (sandy beach) on Jinu-do is rising, and the vegetation zone line, which is the boundary of the coastal sand dunes, shows a tendency to move forward toward the open sea. The vegetation zone line is developing particularly strongly in the offshore direction in areas where the ground level is elevated by more than 1.5 m. (2) The spatial distributions of incident waves differed due to variations in the water depth at the front of the beach, and the wave run-up in the swash zone also displayed complex spatial variations. With a large wave run-up, coastal debris may reach the vegetation zone line, but if the run-up is smaller, coastal debris is more likely to deposit in the form of an independent island on the beach. The deposited coastal debris can then become a factor determining which vegetation zone line advances or retreats. Finally, based on the results of this investigation, a schematic concept of the mechanisms of interaction between the coastal debris and the coastal vegetation zone line due to wave action was derived.
An Investigation on International Patents related to Deep See Water Development
Ju, HyunHee ; Shin, SeungKyoon ; Park, SeongWook ; Ahn, KiSoo ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 3, 2014, Pages 236~246
DOI : 10.7846/JKOSMEE.2014.17.3.236
Deep Sea Water (DSW) has recently drawn attention due to the considerable benefits provided by low-temperature, various minerals included, purity and safety of the water resource. Since Korean DSW-industry initiated exploitation of the alternative water resource in 2008, it merely took off, but remains in the infant stage. It is mainly because the industry has only focused on production of drinkable bottled water, and failed to improve sustainability and competitiveness. On the contrary, not a few oversea DSW industries (e.g. Japanese and Taiwanese DSW industries) have successfully cultivated their markets, and have become leading cases of the industry. The common success factors learned from the cases are as follows; 1) They continuously invest on technology innovation, introduce new DSW-based products, and increase the usability of DSW in various areas of products and services, and 2) they strategically focus on high value-added products rather than just bottled water products. This paper examines the cases of the advanced DSW industries and analyzes patent data and their technology-based development strategies.
A Development of Remote Bird Observation System Using FMCW RADAR
Lee, Hee-Yong ; Hwang, Hun-Gyu ; Choi, Myung-Gil ;
Journal of the Korean Society for Marine Environment & Energy, volume 17, issue 3, 2014, Pages 247~256
DOI : 10.7846/JKOSMEE.2014.17.3.247
Recently, camera and RADAR are used for more effective and accurate observation of the bird migration. In recent years, many researches on the bird migration using RADAR are undertaking and in active, thus causes the advent of "RADAR ornithology" as a new academic field. Due to the lack of accessibility, economic feasibility and mobility of weather RADAR, airport searching RADAR and tracking RADAR, Nowadays, a marine RADAR is widely used for a bird observation. In this paper, we deals with a study on development of a remote bird observation system using marine FMCW RADAR, which monitors, records and analyzes bird movement by RADAR image processing and target recognition technology. Also, we conduct first test and second test for availability of the developed system, and verify the system to apply in bird observation domain. Consequently, we figured problems out, and correct the problems to improve the system. The developed system can apply in other domains such as environment evaluation. In the future, the system needs to improve accuracy of statistics and to track migration route of bird.