• Title/Summary/Keyword: South and West coast

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Distribution of the White Shark, Carcharodon carcharias and Other Sharks around the Korean Waters (한국 연근해 백상아리와 상어류의 분포)

  • Choi, Youn
    • Korean Journal of Ichthyology
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    • v.21 no.sup1
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    • pp.44-51
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    • 2009
  • Greate white sharks, Carcharodon carcharias, are found in almost all the temperate and tropical coastal waters around the world. There have been 19 appearances reported in Korean coastal waters since June 1996 and seven shark attacks have been reported. There are about 400 species of sharks in the world, and 41 species of them have been found in Korean coastal waters. Thirteen of them belong to the Carcharhinidae family, and five of them belong to the Squalidae family. Of these sharks, 15 species of them live off of the East coast, 18 species live off of the West coast, and the other 40 species are distributed around Jeju Island and the South coast. Eleven species of them, including the great white shark, live off of all the coastal waters of Korea.

Numerical study on the characteristics of TKE in coastal area for offshore wind power (해상풍력발전을 위한 연안지역의 난류에너지 특성 수치연구)

  • Yoo, Jung-Woo;Lee, Soon-Hwan;Lee, Hwa-Woon
    • Journal of Environmental Science International
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    • v.23 no.9
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    • pp.1551-1562
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    • 2014
  • To clarify the characteristics of TKE (Turbulence Kinetic Energy) variation for offshore wind power development, several numerical experiments using WRF were carried out in three different coastal area of the Korean Peninsula. Buoyancy, mechanical and shear production term of the TKE budget are fundamental elements in the production or dissipation of turbulence. Turbulent kinetic energy of the south coast region was higher than in other sea areas due to the higher sea surface temperature and strong wind speed. In south coast region, strong wind passing through the Korea Strait is caused by channelling effect of the terrain of the Geoje Island. Although wind speed is weak in east coast, because of large difference in wind speed between the upper and lower layer, the development of mechanical turbulence tend to be predominant. Since lower sea surface temperature and smaller wind shear were detected in west coastal region, the possibility of turbulence production not so great in comparison with other regions. The understanding of the characteristics of turbulence in three different coastal region can be reduced the uncertainty of offshore wind construction.

Quantifying of the Persistent Periods of the Positive and Negative Sea Surface Temperature Anomalies at the Coastal Areas of the Korean Peninsula (한국연안 이상고수온과 저수온의 지속성 기간의 정량화)

  • 서영상;황재동;장이현;강용균
    • Journal of Environmental Science International
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    • v.10 no.2
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    • pp.167-171
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    • 2001
  • The magnitudes of sea surface temperature (SST) anomalies at 13 coastal stations along the Korean peninsula in the summer and winter for the past 29years (1969-1997) are more larger than those in the spring and autumn. The periods of positive SST anomalies (negative SST anomalies) longer than 1$^{\circ}C$ were 75(74.5) months in the eastern coast of Korea, 47.8(51.6) months in the southern coast of Korea and 69.5(69.8) months in the western coast of Korea during the past 348 months (1969-1997). The predominant periods of the low-pass filtered monthly SST anomalies are 3 years or 13 months, even another predominant period is 24 months. The spatial variation of SST anomalies were confined by regional seas of the Korean peninsula, such as the East Sea, the South Sea and the West Sea itself.

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On the Variations of Monthly Mean Sea Levels along the Coast of Korea (한국연안의 월평균해면의 변화에 대하여)

  • Sok-UYi
    • 한국해양학회지
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    • v.2 no.1_2
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    • pp.24-33
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    • 1967
  • The variations of monthly mean sea levels along the coast of Korea anre studied graphic and harmonic methods with the data from 9 tides stations and compared with the variations of atmospheric pressure and the changes in density of sea water measured near some of the stations. The monthly mean sea level generally rises in Summer to Autumn, and falls in Winter to Spring and its range is from 20 cm to 50 cm. The variation of monthly mean sea level is of annual type, having one maximum and one minimum. The semi-range of annual components is 10.5 cm at Pusan and increases to the north in the west coast, to 20.8 cm at Inchon. It's phase is, on the whole, similar for the entire coast with about 210 (middle of August), except at Inchon, 200 . The variation of monthly mean sea level is mainly isostatic, or caused by those of sea water density and atmospheric pressure. Especially, the steric effect is predominant on the south- east coast around Pusan. However, in shallow long bays and estuaries on the west coast, the river runoff effect as well as local wind effect is also considerable. Magnitudes of annual variations at each stations are not constant, but widely variable from year to year. On the east and south coast, especially at Ulneungdo and Pusan the variations are large, which seem to be connected with the shifting of main current axes or current patterns in the offing.

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Swell description for Bonga offshore Nigeria location

  • Olugbenga, Akinsanya Akinyemi;Gudmestad, Ove Tobias;Agbakwuru, Jasper
    • Ocean Systems Engineering
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    • v.7 no.4
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    • pp.345-369
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    • 2017
  • The ocean environment offshore West Africa is considered to be mild. However, the generated swell from distant North and South Atlantic during austral winter and summer can reach high wave amplitudes with relatively low wave periods or low wave amplitudes with long wave periods, the later can be a crucial scenario to consider when the assessment of vessel resonance is of importance. Most offshore operations, which include offshore drilling, and installation in West Africa, are carried out from floating systems. The response of these systems and performance are governed by characteristics, such as amplitude and frequency of the wave and swell seas. It is therefore important to fully understand the sea conditions offshore Nigeria. This study covers the description of the swell sea offshore Nigeria using Bonga offshore wave measurements collected from the directional wave-rider (DWR), positioned at the Bonga site off the coast of Nigeria.

Seasonal properties of airborne chlorides to the result of 3 year-measurement (3년간의 측정결과에 따른 비래염분의 계절별 특성)

  • Lee, Jong-Suk;Ahn, Ki-Hong;Kim, Do-Gyeum;Lee, Jang-Hwa
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.573-576
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    • 2008
  • When the concrete structures are in contact with seawater, concentration of chloride for estimating chloride diffusion coefficient can be defined as the chloride concentration of sea water. However, in case the concrete structures, constructed in the seashore, aren't directly in contact with seawater, it is difficult to establish the interface concentration of chloride. In addition, marine concrete structures are greatly affected by salt attack such as rebar corrosion, among the cause of salt attack, airborne chlorides is primary factor. Therefore, in this study, salt attack environment by airborne chlorides was investigated in terms of a seasonal distribution at 72 spots, 27 areas in the East, West, South coast for 3 years from July '03 to June '06. Results indicated that in the East and South coast, the amount of the airborne chlorides is comparatively higher in summer, in the West coast, higher in winter according to the seasonal wind.

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Selecting the Geographical Optimal Safety Site for Offshore Wind Farms to Reduce the Risk of Coastal Disasters in the Southwest Coast of South Korea (국내 서남해권 연안재해 리스크 저감을 위한 지리적 해상풍력단지 최적 입지 안전구역 선정 연구)

  • Kim, Jun-Gho;Ryu, Geon-Hwa;Kim, Young-Gon;Kim, Sang-Man;Moon, Chae-Joo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.17 no.5
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    • pp.1003-1012
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    • 2022
  • The horizontal force transfer to the turbine and substructure of a wind power generation system is a very important factor in maintaining the safety of the system, but it is inevitably vulnerable to large-scale coastal disasters such as earthquakes and typhoons. Wind power generation systems built on the coast or far offshore are very disadvantageous in terms of economic feasibility due to an increase in initial investment cost because a more robust design is required when installed in areas vulnerable to coastal disasters. In this study, the GIS method was used to select the optimal site for a wind farm from the viewpoint of reducing the risk of coastal disasters. The current status of earthquakes in the West and South Seas of Korea, and the path and intensity of typhoons affecting or passing through the West and South Seas were also analyzed. Accordingly, the optimal offshore wind farm site with the lowest risk of coastal disasters has been selected and will be used as basic research data for offshore wind power projects in the region in the future.

Antimicrobial Resistance in Escherichia coli Isolated from Shellfish Farms on the West Coast of Korea (서해안 패류양식장에서 분리된 대장균의 항균제 내성)

  • Jo, Mi Ra;Park, Yong Su;Park, Kunbawui;Kwon, Ji Young;Yu, Hong Sik;Song, Ki Cheol;Lee, Hee Jung;Oh, Eun Gyoung;Kim, Ji Hoe;Lee, Tae Seek;Kim, Poong Ho
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.49 no.1
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    • pp.13-19
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    • 2016
  • A total of 423 shellfish (Oysters, Crassostrea gigas; short-necked clams, Ruditapes philippinarum and corb shells, Cyclina sinensis) were collected from the west coast of Korea, from which 277 Escherichia coli strains were isolated. The antimicrobial susceptibility patterns of isolated strains were analyzed for 22 antimicrobial agents used in Korea for clinical or veterinary therapy. The resistance of E. coli isolates to ampicillin (37.2%) was highest, followed by cephalothin (21.7%), cefazolin (19.9%), trimethoprim (15.2%). Antimicrobial resistance was present in 56.7% of E. coli isolates against at least one antimicrobial agent. Of 277 isolates, 44 (15.9%) were resistant to multiple antimicrobial agents.

Analysis on Vertical Structure of Sea Fog in the West Coast of the Korean Peninsula by Using Drone (드론을 활용한 한반도 서해 연안의 해무 연직구조 분석)

  • Jeon, Hye-Rim;Park, Mi Eun;Lee, Seung Hyeop;Park, Mir;Lee, Yong Hee
    • Atmosphere
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    • v.32 no.4
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    • pp.307-322
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    • 2022
  • A drone has recently got attention as an instrument for weather observation in lower atmosphere because it can produce the high spatiotemporal resolution weather data even though the weather phenomenon is inaccessible. Sea fog is a weather phenomenon occurred in lower atmosphere, and has observational limitations because it occurs on the sea. Therefore, goal of this study is to analyze the vertical structures about inflow, development and dispersion of sea fog using the high-resolution weather data with the meteorological sensor-equipped drone. This study observed sea fogs in the west coast of the Korean peninsula from March to October 2021 and investigated one sea fog inflowed into the coast on June 8th 2021. θe - qv diagrams (θe: equivalent potential temperature, qv: water vapor ratio) and vertical wind structures were analyzed. At inflow of sea fog, moist adiabatically stable layer was formed in 0-300 m and prevailing wind was switched from south-southwesterly to west-southwesterly under 120 m. Both changes are favorable for sea fog on the location. θe and qv plummeted in a layer 0-183 m. The inflowed sea fog developed from 183 m to 327 m by mixing with ambient atmosphere on top of sea fog. Also, strong mechanical turbulence near ground drove a vertical mixing under stable layer. At dispersion of sea fog, as θe on ground gradually increased, air condition was changed to neutral. Evaporation occurred on both bottom and top in sea fog. These results induced dissipation of sea fog.

Tidal Flat Aspects of Yellow Sea Area and Conservation for Migratory Birds (서해안 갯벌 현황과 철새에 대한 보전 방안)

  • 이시완;제종길;이한수
    • Korean Journal of Environment and Ecology
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    • v.17 no.3
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    • pp.295-303
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    • 2003
  • The tidal flat area of south and west coast consists of 2.4% of total land area of Korea. About 83% of tidal flat is located at the west coast, and the remaining tidal flat is located at the south coast. This tidal flat is also divided for administrative regions which are Gyeonggi Province(35.1%), Chungnam Province(12.7%) Jeonbuk Province(4.7%), Jeonnam Province(44.0%) and Gyeongnam Province(3.5%). The tidal flat of west coast of Korea is one of the most important stopover site for shorebirds on the East Asia-Australia Flyway. The tidal flat is used for feeding and resting place by migratory shorebirds. Generally, waterbirds including migratory shorebirds are considered as key species to show the superiority of wetland. By the criteria of Lamsar Convention in the basis of waterbird, at least 14 coastal wetlands in Korea have to be internationally important wetlands. The factors to affect the distribution of shorebirds at the certain tidal flat are closely related with 1) the distribution of benthic invertebrates, potential prey of shorebirds 2) the availability of roosting site 3) the size of tidal flat 4) the intensity of human disturbance. In this paper, we summarized the regional status of tidal flat of Korea and its conservation methods related with migratory waterbirds.