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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Marine Environment & Safety
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Journal DOI :
The Korean Society of Marine Environment and safety
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Volume & Issues
Volume 21, Issue 6 - Dec 2015
Volume 21, Issue 5 - Oct 2015
Volume 21, Issue 4 - Aug 2015
Volume 21, Issue 3 - Jun 2015
Volume 21, Issue 2 - Apr 2015
Volume 21, Issue 1 - Feb 2015
Selecting the target year
A Study on Physical Characteristic of Ground water and Sediment Property in Intertidal Flat of Nakdong River Estuary
Kim, Heon-Tae ; Kim, Kyunghoi ; Ryu, Sung-Hoon ; Lee, In-Cheol ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 467~473
DOI : 10.7837/kosomes.2015.21.5.467
In the present study, we investigated the physical characteristics of ground water behaviors and sediment properties in intertidal flat of Nakdong River Estuary. Variations in level and temperature of the groundwater depended on tides. And increase of river discharge led to increase in groundwater level and decrease in ground salinity at a depth of several ten cm. Difference in permeability of the intertidal flat sediments due to content of fine fraction affect velocity of groundwtaer level decrease at low tide. Furthermore, enhancement of groundwater flow due to the increase in permeability leaded to decrease of fine fraction in the intertidal flat sediments.
Seasonal Change of Phytoplankton Dominant Species Based on Water Mass in the Coastal Areas of the East Sea
Shim, Jeong-Min ; Kwon, Ki-Young ; Kim, Sang-Woo ; Yoon, Byong-Seon ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 474~483
DOI : 10.7837/kosomes.2015.21.5.474
In order to understand the seasonal change of phytoplankton as well as the effect of water physico-chemical parameters, we investigated 18 stations in coastal areas of the East Sea in February, May, August and November in 2009. The taxa of phytoplankton observed in this study were classified as 37 Bacillariophyceae, 22 Dinophyceae, 1 Euglenophyceae, 3 Dictyophyceae and 1 Cryptophyceae. Phytoplankton abundance ranged from
(with a mean value of
), the highest biomass was observed in May. The dominant species were Leptocylindrus danicus, Chaetoceros affinis, Pseudo-nitzschia pungens, Thalassionema nitzschioides and etc. Pearson's correlation co-efficient between phytoplankton abundance and other water parameters showed the positive relationships with pH, DO, Secchi-disk depth, and SS, the negative relationships with
. Seasonal patterns of phytoplankton dominant species were affected by the characteristics of water masses based on T-S diagram analysis. In particular, phytoplankton distributional patterns were related with water temperature in May and salinity in August, respectively. According to the result of MDS(Multi-dimensional scaling) using the phytoplankton abundance and species composition, the spatial distribution of phytoplankton were characterized with Ganwon(Group A) and Gyeongbuk(Group B) at the coastal areas of Jukbyeon or Uljin.
Suitable Site Assessment using Habitat Suitability Index for Ruditapes philippinarum in Gochang(Hajun)
Jeon, Seungryul ; Choi, Yoon-Seok ; Cho, Yoon-Sik ; Kim, Yeong-Tae ; Choi, Yonghyeon ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 484~491
DOI : 10.7837/kosomes.2015.21.5.484
The productivity of Manila clam(Ruditapes philippinarum) aquaculture farm is closely related to suitable site selection, so it is essential to assess the habitat suitable for aquaculture species in order to manage yield. This study evaluated the habitat suitable index(HSI) with 9 sites for tidal flat farm, Gochang(Hajun) on May 2014. The suitability index was selected Growth(hydrodynamics, chlorophyll a), Survival(sediment-sand, silt-clay) and Water Environment(dissolved oxygen, salinity). Both Weight and No weight were tried for objective judgment as HSI scoring method. As a result, it shows lower tidal flat(HSI; No weight: 0.60~0.76, Weight: 0.47~0.70) is higher than upper(HSI; No weight: 0.25~0.27, Weight: 0.09~0.10), hydrodynamics and sediment particle size are the most effective. This research can consider the potential suitable site for Manila clam through scientific approach, and provide the basis for optimal management practices in tidal flat farm.
Public Attitudes to Saemangeum Development Project and Its Effects on Marine Environment
Baek, Min-Ji ; Choi, Hyo-Yeon ; Yoo, Seung-Hoon ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 492~500
DOI : 10.7837/kosomes.2015.21.5.492
This paper attempts to analyze the public's attitudes about the Saemangeum development project and its impact on marine environment with the data from a national survey of 1,000 households obtained by a professional survey firm with face-to-face interviews using two split samples: a sample of 400 households in on-site area (Saemangeum area) and a sample of 600 households in off-site area (the nation except for Saemanguem area). More specifically, ordered probit model is employed to investigating the factors affecting the public attitudes to the Saemanguem development project. The results show that over 70 percentage of respondents in both the samples opposed Saemanguem development project when they considered its economic gain and impacts on marine environment at the same time. Futhermore, over 90 percentage of respondents judged that environmental management of Saemanguem open sea is necessary. Therefore, making appropriate actions are required to manage marine environment of Saemanguem open sea.
A Study on Maritime Traffic Characteristics according to Water Time(Multte)
Yoo, Sang-Lok ; Jeong, Cho-Young ; Jeong, Jae-Yong ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 501~506
DOI : 10.7837/kosomes.2015.21.5.501
This study seeks to analyze ships traffic characteristics according to water time in order to provide the necessary data for efficient traffic management development. To analyze maritime traffic volume according to water time, 1 year amount of solar calendar data were converted into lunar calendar, and then applied the traditional water time system of West Sea by using AIS(Automatic Identification System) observation data gathered in Mokpo port for a year of 2013. As a result, it was found herein that the number of outbound ships was larger on the
water times than the
water times by 23-24 %. And the number of inbound ships was higher on the
water times than the
water time by 29-33 %. The hourly variation index of inbound and outbound ships according to time, in particular, was found to change in the form of sine function model. This study is expected to serve as a necessary basic material for development of maritime traffic management according to water time.
An Empirical Study on the Improvement of Marine Traffic System at the Pyeong-taek Adjacent Areas
Yoon, Byoung-Won ; Park, Jin-Soo ; Park, Young-Soo ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 507~514
DOI : 10.7837/kosomes.2015.21.5.507
This study focused on the investigating of the improving measure of marine traffic system around Pyung-Taek Pilotage area. First, we analyzed the marine traffic environment on the study area based on the expert point of view of pilot and shipmasters. Then suggested the following countermeasures to improve the traffic safety according to the analytic results of the hazardous items on the Jangan-Seo and Ippa pilot embarking/disembarking area. We suggested to establish Mokdeok-do TSS and TSS in Ando area, and to adjust the width of Jangan-seo TSS to improve the congestion on the TSSs. Also suggest to put lightbuoys along the outer limit of the TSS. In addition, recommend to establish traffic safety specific area on the Jangan-seo/Ippa-do water, and to suggest expand the anchorage area of Ippa and Jangan-seo anchorage. It is anticipated to improve the traffic safety on the study area through the marine traffic system improvements.
A Study on Human Error of DP Vessels LOP Incidents
Chae, Chong-Ju ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 515~523
DOI : 10.7837/kosomes.2015.21.5.515
This study reviewed 612 DP LOP(Loss of Position) incident reports which submitted to IMCA from 2001~2010 and identified 103 human error caused incidents and classified it through HFACS. And, this study analysis of conditional probability of human error on DP LOP incidents through application of bayesian network. As a result, all 103 human error related DP LOP incidents were caused by unsafe acts, and among unsafe acts 70 incidents(68.0 %) were related to skill based error which are the largest proportion of human error causes. Among skill based error, 60(58.3%) incidents were involved inadvertent use of controls and 8(7.8%) incidents were involved omitted step in procedure. Also, 21(20.8%) incidents were involved improper maneuver because of decision error. Also this study identified that unsafe supervision(68%) is effected as the largest latent causes of unsafe acts through application to bayesian network. As a results, it is identified that combined analysis of HFACS and bayesian network are useful tool for human error analysis. Based on these results, this study suggest 9 recommendations such as polices, interpersonal interaction, training etc. to prevent and mitigate human errors during DP operations.
A Legislative consideration on protection and regulation of Assembly and Demonstration at sea
Soon, Gil-Tae ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 524~530
DOI : 10.7837/kosomes.2015.21.5.524
In this study, I present solutions to properly regulate assembly and demonstration at sea which has not been relatively secured and regulated compared to that of on land and inland waters so it may not violate public safety and order, and at the same time to secure it as a basic human right. Firstly, to protect and regulate in the same way with assembly and demonstration on land, I suggest to make amendments to "Law on Assembly and Demonstration" so that Korea Coast Guard Station can accept applications and administrator maritime assembly and demonstration. Secondly, in special cases where there are difficulties in the application of "Law on Assembly and Demonstration" due to the special maritime environment, following the example of Japan, America and England who have regulations in related special laws, I suggest an legislative alternative to add regulations on maritime assembly and demonstration in "Law on Maritime Guard" so that we can administer maritime assembly and demonstration in a way which there should be no conflict between basic human right of people and conservation of public safety.
A Study on a Two-Axis Solar Tracking System Based on Fuzzy Logic Control
Ahn, Byeongwon ; Lee, Hui-Bae ; Bae, Cherl-O ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 531~537
DOI : 10.7837/kosomes.2015.21.5.531
In order to maximize power output from the solar panels, one needs to keep the panels aligned with the sun. So solar tracker having high reliability must be designed. This paper cares about the design and evaluation of a two-axis solar tracker system based on fuzzy logic control with LabVIEW. The research focus on planning mechanical parts, making an intelligent controller which controls and monitors all parameters via user interface implemented of a fuzzy decision support system for control of photovoltaic panel movement. We also develop a real solar tracker system and analyze the influence indexes such as environment, weather, season, and light condition. The solar tracker is tested in real condition and all parameters related to the system operation are recorded and analyzed. The developed solar tracking system got a much higher efficiency about 38 % compare to fixed solar panel although the weather condition is affected a lot to the solar panel. So we confirmed the our auto tracking system is more effective and can allow more energy to be produced.
A General Formula for Calculating the Value of Transverse Moment of Inertia by Observing the Roll Motion of Ships
Choi, Soon-Man ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 538~542
DOI : 10.7837/kosomes.2015.21.5.538
The transverse moment of inertia is an indispensable factor in analyzing the roll motion characteristics of ships and the calculating method needs to be based on the more reasonable theories when deciding the value as the results and reliability of analysis could be much affected by the correctness. However, the mass distribution and shape of hulls are quite complicated and give much difficulties in case of calculating the value directly from the ship design data, furthermore even acquiring the detailed design data for calculation is almost impossible. Therefore some simpler ways are practically adopted in the assumption that the gyradius of roll moment can be decided by a given ratio and hull width. It is well known that the responses of the free roll decay are varied according to the value of roll moment in view of roll period and amplitude decay ratio, so that the general formula to get the moment value can be derived also from the observation of roll decay responses. This study presents how the roll period and decay ratio are interrelated each other from the roll motion characteristics with suggesting a general formula to be able to calculate roll moment from it. Finally, the obtained general formula has been applied to a ship data to check the resultant characteristics through analyzing graphs and showed that the roll moment becomes more accurate when rolling period and decay ratio are considered together in calculation.
Ultimate Strength Prediction Formula Estimation of Aluminium Alloy Plate Girders Subjected to Patch Loading
Oh, Young-Cheol ; Seo, Kwang-Cheol ; Ko, Jae-Yong ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 543~551
DOI : 10.7837/kosomes.2015.21.5.543
In this paper, Used on the bridge and ship, investigate the physical relationship of aluminium plate girders(A6082-T6) considering the marine environment. Plate girder will experience the patch loading such as moving load, surcharge in the product life cycle. The ultimate strength of aluminum plate girders subjected to these loads applied multiple numerical model and performed the elasto-plastic large deflection series analysis and was proposed the predicted formula for regression analysis. The predicted formula was shown by the relationship of ultimate strength and slenderness. If the slenderness is low(0-2.3), it causes a 9 % error, and If the slenderness is higher(2.3-4.0), it causes a 1-2 % error. Therefore, the propriety of proposed prediction formular was found to be assess rationally.
A Study on the Manoeuvrability as Function of Stern Hull Form in Shallow Water
Lee, Sungwook ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 552~557
DOI : 10.7837/kosomes.2015.21.5.552
A numerical simulation studies were performed to investigate a manoeuvring characteristics as function of stern hull form with the mathematical model. In order to consider the effect of the stern hull form and obtain the manoeuvring characteristics, a parameter(
) which is aft. water plane area coefficient is modified. Because modifying
) means that the stern hull form is modified to V-type or U-type, the numerical simulation was performed with this modified
. A changing trend for the manoeuvring characteristics not only in deep water but also in shallow water such as directional stability, turning and zig-zag was investigated and presented as the results. Present study showed that the manoeuvrability in shallow water largely changed when the draught and water depth ratio(=d/H) become 0.5, and the stern hull form can affect to the manoeuvrability of a vessel navigating in restricted water depth. In addition, it showed that approaching the stern hull to U-type makes the advance and tactical diameter of turning motion large and the overshoot angle of zig-zag motions small. Otherwise, it showed approaching the stern hull form to V-type makes the advance and tactical diameter of turning motion small and the overshoot angle of zig-zag motions large in the present study.
A Study on the Green Ship Design for Ultra Large Container Ship
Kim, Mingyu ; Park, Dong-Woo ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 558~570
DOI : 10.7837/kosomes.2015.21.5.558
A study on the green ship design for Ultra Large Container Ship (ULCS, 18,000 TEU Class Container Ship) was performed based on the four step procedures of the initial design and hull form optimization to maximize economic and propulsive performance. The first, the design procedure for ULCS was surveyed with economic evaluation considering environmental rules and regulations. The second, the characteristics of single and twin skeg container ships were investigated in view of initial design and performances. The third, the hull form optimization for single and twin skeg ships with the same dimensions was conducted to improve the resistance and propulsive performances at design draught and speed by several variations and the results of the optimization were verified by numerical calculations of CFD and model test. The last, for the estimated operating profile of draught and speed, the hull forms of single and twin sked ships were optimized by CFD. From this study, the methodologies to optimize the hull form of ULCS were proposed with considerations during the green ship design and the improvement of the energy efficiency for the optimized hull forms was confirmed by the proposed formula of the total energy considering design conditions, operating profile and fuel oil consumption.
A Comparative Study of Wave Height Estimation base on X-band Radar
Yang, Young-Jun ; Park, Jun-Soo ; Park, Seung-Geun ; Kwon, Sun-Hong ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 571~576
DOI : 10.7837/kosomes.2015.21.5.571
This paper presents a comparative study of wave height estimation method that was used for signal to noise ratio and shadowing ratio based on X-band marine radar. If the signal to noise ratio, and is widely used as a method for estimating an wave height, a new method is presented for shadowing ratio. In the case of radar images used in this study it is measuring the data from the coast of Ulsan Jujeon, compared with marine meteorological information from the Meteorological Agency measured a light beacon. We compared the measured data for about 34 days, the typhoon was measured, incluidng a period in the East Sea, and verify the results for various distribution of wave height. For estimate wave height using a shadowing ratio analysis, it does not require calibration and real-time advantages of this part, coming confirmed the possibility of the measurement, the cause detection error for radar image was caused due to determine.
Numerical Analysis of Cold Storage System with Array of Solid-Liquid Phase Change Module
Mun, Soo-Beom ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 577~582
DOI : 10.7837/kosomes.2015.21.5.577
This paper is the fundamental study for the application of cold storage system to the transportation equipment by sea and land. This numerical study presents the solid-liquid phase change phenomenon of calcium chloride solution of 30wt %. The governing equations are 1-dimensional unsteady state heat transfer equations of
order partial differential equations. This type of latent heat storage material is often usable in fishery vessel for controlling the temperature of container with constant condition. The governing equation was discretized with finite difference method and the program was composed with Mathcad program. The main parameters of this solution were the initial temperature of heat storage material, ambient temperature of cold air and the velocity of cold air. The data of boundary layer thickness becomes thin with the increasing of cold air flowing velocity and also the heat storage completion time become shorten.
Wave Simulation for Submarine Cable Route of Southwest Sea Offshore Wind Farm Using the SWAN Model
Ryu, Hwang-Jin ; Kim, Sang-Ho ; Kwoun, Chul-Hui ; Cho, Kwang-Woo ; Maeng, Jun-Ho ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 583~590
DOI : 10.7837/kosomes.2015.21.5.583
Submarine cable installation is essentials for grid connection between existing power grid and newly produced electricity which will be from offshore wind farm in Southwest sea area of Korea. Especially, submarine cable route and protection method is designed in order to ensure the economical efficiency, workability and stability of submarine cable installation. On this paper, we will give the basic information about the submarine cable route and protection method of offshore wind farm which will be built in Southwest sea area of Korea. For this, we have a numerical simulation at high and low tide based on the third-generation wave model SWAN(Simulating WAves Nearshore) using the long term wave data from Korea Institute of Ocean Science and Technology(KIOST). The results of the study, year mean Hs is 1.03m, Tz is 4.47s and dominant wave direction is NW and SSW When the incident wave direction is NW(Hs: 7.0 m, Tp: 11.76s), the distribution of shallow water design wave height Hs was calculated about 4.0~5.0m at high tide and 2.0~3.0m at low tide. When the incident wave direction is SSW(Hs: 5.84 m, Tp: 11.15s), the distribution of shallow water design wave height Hs was calculated about 3.5~4.5m at high tide and 1.5~2.5m at low tide. The wave direction on a dominant influence in the section of longitude UTM 249749~251349(about 1.6 km) and UTM 251549~267749(about 16.2 km) in the submarine cable route are each NW and SSW. Prominently, wave focusing phenomenon appears between Wi-do and Hawangdeung-do, in this sea area is showing a relatively high wave hight than the surrounding sea areas.
Analysis of Hydraulic Characteristic in Surf Zone using the SWASH Model during Typhoon NAKRI(1412) in Haeundae Beach
Lee, Jong-Sup ; Park, Myeong-Won ; Kang, Min-Ho ; Kang, Tae-Soon ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 591~598
DOI : 10.7837/kosomes.2015.21.5.591
A hydraulic characteristics in the surf zone such as wave breaking points, wave set-down, wave set-up, wave-induced currents and run-up heights are studied using the SWASH model during Typhoon NAKRI(1412) in Haeundae Beach. Incident wave conditions is obtained from one-hourly observed wave data by KHOA and irregular wave by JONSWAP spectrum is given as an open boundary condition in the model. A Wave-induced current patterns by the SWASH model is compared with the observed currents and sediment flux patterns in that areas, the calculated maximum wave run-up heights in the model is compared with the video monitoring data, the empirical formula by Stockdon et al. and Mase. A dominant longshore currents toward the east of the beach appears due to the effect of incident wave direction and the geographical features and some rip currents occurs at the central part of the beach. The maximum wave run-up height(1.15 m) by the SWASH model shows a similar pattern with the video monitoring data(1.26 m) and the magnitude shows a similar result(1.33m) by Stockdon et al.
Coastal Wave Hind-Casting Modelling Using ECMWF Wind Dataset
Kang, Tae-Soon ; Park, Jong-Jip ; Eum, Ho-Sik ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 599~607
DOI : 10.7837/kosomes.2015.21.5.599
The purpose of this study is to reproduce long-term wave fields in coastal waters of Korea based on wave hind-casting modelling and discuss its applications. To validate wind data(NCEP, ECMWF, JMA-MSM), comparison of wind data was done with wave buoy data. JMA-MSM predicted wind data with high accuracy. But due to relatively longer period of ECMWF wind data as compared to that of JMA-MSM, wind data set of ECMWF(2001~2014) was used to perform wave hind-casting modelling. Results from numerical modelling were verified with the observed data of wave buoys installed by Korea Meteorological Administration(KMA) and Korea Hydrographic and Oceanographic Agency(KHOA) on offshore waters. The results agree well with observations at buoy stations, especially during the event periods such as a typhoon. Consequently, the wave data reproduced by wave hind-casting modelling was used to obtain missing data in wave observation buoys. The obtained missing data indicated underestimation of maximum wave height during the event period at some points of buoys. Reasons for such underestimation may be due to larger time interval and resolution of the input wind data, water depth and grid size etc. The methodology used in present study can be used to analyze coastal erosion data in conjunction with a wave characteristic of the event period in coastal areas. Additionally, the method can be used in the coastal disaster vulnerability assessment to generate wave points of interest.
Storm Surge Vulnerability Assessment due to Typhoon Attack on Coastal area in Korea
Kang, Tae-Soon ; Oh, Hyeong-Min ; Lee, Hae-Mi ; Eum, Ho-Sik ;
Journal of the Korean Society of Marine Environment & Safety, volume 21, issue 5, 2015, Pages 608~616
DOI : 10.7837/kosomes.2015.21.5.608
In this study, we have estimated the storm surge heights using numerical modeling on coastal area, and then evaluated the vulnerability index by applying the vulnerability assessment techniques. Surge modelling for 27 typhoons affected from 2000 to 2014 were simulated by applying the ADCIRC model. The results of validation and verification was in significant agreement as compared with observations for the top 6 ranking typhoons affected. As results, the storm surge heights in Jinhae Bay, Sacheon Bay, Gwangyang Bay, Cheonsu Bay and Gyeonggi Bay were higher than other inner coastal areas, then storm surge vulnerability assessment was performed using a standardization, normalization and gradation of storm surge heights. According to results of storm surge vulnerability assessment, index of Jinhae Bay, Sacheon Bay, Gwangyang Bay etc. are estimated to be vulnerable(4~5) because of the characteristics of storm surge such as inner bay are vulnerable compared with exposed to the open sea areas. However, index in the inner bay of western Jeonnam are not vulnerable(1~3) relatively. It may not appear the typhoons affected significantly for the past 15 years. So, the long-term vulnerability assessment with the sensitivity of geomorphology are necessary to reduce the uncertainty.