• 제목/요약/키워드: Southwest sea area

검색결과 123건 처리시간 0.028초

A Research on the Forms and Characteristics of the Ondal Cave

  • Hong, Hyun-Cheal
    • 동굴
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    • 제4호
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    • pp.3-9
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    • 1996
  • Ondal cave is located in Ha-ri Yongchun - myon, Tanyang - gun, Chungchongbuk - do, which has its site at the valley of southern side of Namhangang which winds up to the southwest. Namsan is kurungbong which is at the mid - slope of the steep and high mountain, Songsan which is 427 m high above sea level, and shows the aspect of the limestone area, a rough and steep mountain one.(omitted)

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신해양질서 10년후 세계어업자원 이용동향 (The Exploitation of World Fishery Resources for 10 Years under the New Regime in the Sea)

  • 이장욱;허영희
    • 수산경영론집
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    • 제23권1호
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    • pp.43-87
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    • 1992
  • In this paper, state of exploitation of world fishery resources after 10 years under the new regime in the sea, called the era of exclusive economic zone (EEZ) expending up to a 200 nautical miles from coastal line, was reviewed to determine effect from establishing EEZ in the world fishery production and its export/import volume based on the fishery statistics annually published by the Food and Agriculture Organization (FAO) of United Nation. The world total production from marine living resources had a trend showing a waned increase during 1970's when most of coastal states were translated into the reality of EEZ. From mid-1980's onwards, it increased rapidly, reaching about 85 million tons . Such increase in production was basically from the Pacific Ocean, accounting for more than 60% of the world total production. Fishing areas where showed increase in the production after the new regime in the sea were the southwestern Atlantic (FAO area 41) , the eastern Indian (FAO area 57) and the whole fishing areas in the Pacific except the eastern central Pacific (FAO area 77). Increase in the production from distant-water fishing countries came from the regions of the southwest Atlantic (FAO area 41) and the southwest Pacific (FAO area 81) . The production from coastal states was up from the regions of the eastern Indian (FAO area 57) , the northwest and northeast Pacific (FAO areas 61 and 67) and the southeast Pacific (FAO area 87) . It was likely that the exploitation of the fishable stocks was well monitored in the areas of the northwest Atlantic (FAO area 21) , the eastern central Atlantic (FAO area 34) and the northeast Pacific (FAO area 67) through appropriate management measures such as annual harvest level, establishment of total allowable catch etc. The marine fisheries resources that have made contribution to the world production, despite expansion of 200 EEZ by coastal states, were sardinellas, Atlantic cod, blue whiting and squids in the Atlantic Ocean : tunas which mainly include skipjack, yellowfin and bigeye tuna, croakers and pony fishes in the Indian Ocean : and sardine, Chilean pilchard, Alaska pollock, tunas (skipjack and yellowfin tuna) , blue grenadier and blue whiting including anchoveta in the Pacific Ocean. It was identified that both fishery production and its export since introduction of the new regime in the sea were dominated by such coastal states as USA, Canada, Indonesia, Thailand, Mexico, South Africa and Newzealand. But difficulties have been experienced in the European countries including Norway, Spain, Japan and Rep. of Korea. Therefore, majority of coastal states are unlikely to have yet undertaken proper utilization as well as rational management of marine living resources in their jurisdiction during the last two decades. The main target species groups which led the world fishery production to go up were Alaska pollock, cods, tunas, sardinellas, chub and jack mackerel and anchoveta. These stocks are largely expected to continue to contribute to the production. The fisheries resources which are unexploited, underexploited and/or lightly exploited at present and which will be contributed to the world production in future are identified with cephalopods, Pacific jack mackerel and Atlantic mackerel, silver hake including anchovies. These resources mainly distribute in the Pacific regions, especially FAO statistical fishing areas 67, 77 and 87. It was likely to premature to conclude that the new regime in the sea was only in favour of coastal states in fishey production.

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Intersexuality of Scomberomorus niphonius from the Coastal Area around Jeju Island, Korea (Teleostei: Scombridae)

  • Kim, Jong Bin;Chang, Dae Soo;Kim, Hyejin;Jeon, Mi Ae;Ku, Kayeon;Lee, Jung Sick
    • 한국발생생물학회지:발생과생식
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    • 제17권2호
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    • pp.73-78
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    • 2013
  • This study histologically describes the intersexuality of Scomberomorus niphonius collected from the coastal area near Jeju Island. A total of 126 S. niphonius, collected from March to July 2012 with a total length of 62.4 cm (${\pm}17.5$) and a total weight of 1,701.9 g (${\pm}1,528.9$) were used for analyses. From a histological perspective, two types of intersex were confirmed. One type had scattered germ cells from the opposite sex within the gonad. The second type developed germ cells from the opposite sex in the connective tissue of the outer gonadal membrane. The intersexuality was 14.3% (n=18/126), with females (21.3%; n=16/75) exhibiting a higher rate than males (3.9%; n=2/51). There was no displayed correlation between intersexuality and the total length and weight.

북동태평양 한국 심해저 연구지역 망간단괴의 지역적 분포와 퇴적환경 (Regional Occurrence and Sedimentary Environment of Manganese Nodule in KODOS area, C-C zone of NE Pacific)

  • 지상범;강정극;오재경;손승규;박정기
    • Ocean and Polar Research
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    • 제25권3호
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    • pp.257-267
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    • 2003
  • Deep-sea bottom photographs acquired in the Clarion-Clipperton fracture zone of the northeast equatorial Pacific were analyzed to reveal the controlling processes for the spatial variation of manganese nodule. The results show that regional-scale occurrence variations of manganese nodule are mainly controlled by primary productivity of surface water, sedimentation rate, and water depth (or carbonate compensation depth). As a result, the diagenetic accretion on nodules increases toward southwest while hydrogenetic accretion increases toward northeast. Considering the northwestward movement of Pacific Plate, this regional-scale variation of manganese nodule occurrence seems to be affected by oceanic environment during the active growth period (Oligocene-Miocene) of Pacific Plate.

MM5-CAMx를 이용한 대기오염물질의 재순환현상 모델링: 2004년 6월 수도권 오존오염 사례연구 (Modeling of the Air Pollutant Recirculation using the MM5-CAMx on Ozone Episode in Greater Seoul Area during June, 2004)

  • 김유근;오인보;강윤희;황미경
    • 한국대기환경학회지
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    • 제23권3호
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    • pp.297-310
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    • 2007
  • Recent evidence has demonstrated that the pollutant recirculation can play an important role in leading to high ozone $(O_3)$ concentrations. In this study, the MM5-CAMx air quality modeling system was applied to simulate the pollutant recirculation and identify the transport of pollution during the high $O_3$ event (the maximum $O_3$ of 195 ppb) observed in the Greater Seoul Area (GSA) on $1{\sim}4$ June in 2004. The results showed a weak northeasterly synoptic wind during the night and early morning moved the air parcels containing the locally emitted urban pollution to the coast, which contributed to enhance $O_3$ formation in the southwest part of the GSA. As the sea breeze developed and started to penetrate inland in the late afternoon, the rapid build-up of $O_3$ concentration was found in the southwest coastal area due to the recirculation of the polluted air loaded with high level $O_3$. The simulated backward trajectories and observations at coastal sites confirmed the recirculation of pollutant with the late sea breeze is the dominant factor affecting the occurrence of high $O_3$ concentrations in the southwestern GSA.

제주도 근해 참조기 유자망 어장의 폐어구 분포현황 (Characteristics of lost fishing gear distribution on the sea bed around gillnet fishing ground for yellow croaker in the near sea of Jeju, Korea)

  • 김병엽;서두옥;최찬문;이창헌;장대수;오택윤;김영혜;김정년
    • 수산해양기술연구
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    • 제46권4호
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    • pp.441-448
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    • 2010
  • This paper was concentrated on the distribution and the composition of lost fishing gear on the sea bed around yellow croaker fishing ground in the near sea of Jeju, Korea from April to October 2009 in order to improve the fishery environment. Recovering lost fishing gears was carried out total 10 times with a trawlnet along the isobath. As the result, it seems reasonable to conclude that the amount of lost fishing gear has a deep connection with the dip of the sea bed as well as the fishing gear scale, fishing ground and so on. The amount of recovered lost fishing gears were in order of gillnets, dragged gears, traps and ropes. In particular, traps were recovered almost every time within the survey area.

해상가두리 및 실내 육상수조에서 북방전복, Haliotis discus hannai 치패의 적정 수용밀도에 관한 연구 (A Study on the Optimum Stocking Density of the Juvenile Abalone, Hailotis discus hannai Net Cage Culture or Indoor Tank Culture)

  • 김병학;박민우;손맹현;김태익;;명정인
    • 한국패류학회지
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    • 제29권3호
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    • pp.189-195
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    • 2013
  • 전복 치패의 성장은 해상가두리의 경우 $m^2$ 당 150마리 실험구에서 $60.53{\pm}5.75$ mm로 가장 빨랐고, 300마리 $54.01{\pm}5.17$ mm, 450마리 $51.48{\pm}5.37$ mm 및 600마리 $51.09{\pm}4.96$ mm 순으로 나타났다. 육상수조의 경우 $m^2$ 당 150마리 실험구에서 $47.50{\pm}6.31$ mm로 가장 빨랐고, 300마리 $45.92{\pm}5.23$ mm, 450마리 $44.24{\pm}5.59$ mm 및 600마리 $43.62{\pm}4.44$ mm 순으로 나타났다. 생존율은 모든 실험구에서 97.9% 이상으로 나타나 유의적인 차이는 보이지 않았다. 실험 결과 실험개시 후 3개월 이전에는 성장 차이가 나지 않았으나, 3개월 이후에는 성장 차이가 나타나기 시작하여 6개월부터는 뚜렷한 차이를 보였다. 특히 고밀도 실험구인 450마리 및 600마리에서는 3개월 후부터 성장이 둔화되는 경향이 나타났고, 비교적 낮은 300마리 실험구에서도 6개월 후부터 150마리 실험구에 비해 성장이 둔화되는 경향이 나타났다. 본 실험의 결과를 종합하여 전복 가두리양식에 적용하면 일반적인 수용밀도인 $m^2$ 당 300마리 ($2.4{\times}2.4$ m, 1칸당 1,500마리) 로 1년간 사육 후 분조하는 방법에서는 사육개시 6개월 이후부터 성장이 급격히 둔화 될 것으로 생각된다. 그러므로 기존의 1년 후 분조하는 방법으로 사육할 경우는 $m^2$ 당 150마리 ($2.4{\times}2.4$ m, 1칸 당 750마리) 가 적정 수용밀도라 생각되고, 기존의 수용밀도인 $m^2$ 당 300마리로 사육할 경우 6개월 후 분조하여 밀도를 낮출 필요가 있으며, 이러한 방법을 전복 가두리양식에 적용하는 것이 양식 생산성 향상에 도움이 될 것으로 판단된다.

전남 완도군 신지면 일대의 고해안퇴적층과 최종간빙기 고해수면 증거 (The Evidence for the High Sea Level of MIS 5e and the Paleo-coastal Sediments from Sinji-myen, Wando-gun, Jeollanam-do, Korea)

  • 신원정;이재호;변종민;김종연
    • 한국지형학회지
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    • 제26권1호
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    • pp.59-78
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    • 2019
  • The physical and chemical characteristics of more than 5 m sandy deposits behind the beach in Sinji-do Island are investigated and its burial ages are estimated using Optically Stimulated Luminescence. By the estimated burial ages of the sandy deposits, this section is divided into four sub-units: Unit I (6.2 ka), Unit II (23.2 ka), Unit III (115.9 ka), and Unit IV (115.9 to 127.5 ka). It can be proposed that the Unit I of a coarse sand deposited during the Holocene Climatic Optimum. Unit II, supposed to be the aeolian sediments, formed during the Last Glacial Maximum (LGM). It can be supposed that the study area was not affected by the marine processes during the LGM, directly. Unit III is more consolidated deposits of coarse silt to fine sand and deposited during the Last Interglacial Period. Unit IV mainly consist of beach gravels with sandy matrix deposited during the Marine Isotope Stage 5e (MIS 5e), and thus indicates that the sea level of the southwest sea had risen 3 to 5 m above present sea level during the MIS 5e.

동해 왕돌초 주변 해역의 동계와 하계 식물플랑크톤 군집 분포 (The Community Structure of Phytoplankton in Winter and Summer Around Wangdol-cho)

  • 심정민;진현국;성기탁;황재동;윤석현;이용화;김영숙;권기영
    • 한국환경과학회지
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    • 제17권12호
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    • pp.1403-1411
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    • 2008
  • Wangdol-cho, located 23 km offshore of Hupo in southwest of East Sea, is underwater rock floor, called to Wangdol-Am or Wangdol-Jam and has three tops as Mat-Jam, Middle-Jam and Set-Jam. The composition, abundance, diversity and community structure were investigated in winter and summer in 2002 around Wangdol-cho. The temperature around the Northwest and Southeast part of Wangdol-cho was influenced by the North Korea Cold Current (NKCC) and East Korea Warm Current (EKWC), respectively. Nutrient and chlorophyll-a concentration were higher at the top of Wangdol-cho than other area. A total of 41 genera and 78 species of phytoplankton were identified. The average cell abundance of phytoplankton in winter and summer were $286{\times}10^3\;cells/m^3,\;432{\times}10^3\;cells/m^3$ respectively. The largest community was Bacillariophyta containing 52 taxa. The dominant species were Lauderia anulata and Coscinodiscus spp. which preferred cold water in winter. In contrast, warm water species such as Rhizosolenia stolterfothii and Ceratium spp. were dominant in summer. The average species diversity index of phytoplankton in winter was higher than that in summer. According to dominant species and standing crops, phytoplankton community resulted in a clear separation. One group was western area, which showed low density, and the other was eastern area, which showed the higher density. The abundance and species composition of phytoplankton. were affected by topological characteristics around Wangdol-cho.

한국남서해역의 해양환경과 와편모조류 시스트 분포 특성 (The Marine Environment and Dinoflagellates Cysts in the Southwestern Sea of Korea)

  • 박종식;윤양호;노일현;서호영;신현호
    • ALGAE
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    • 제23권2호
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    • pp.135-140
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    • 2008
  • A field survey for dinoflagellate cysts was carried out from May 2000 to November 2002 for the Southwest Sea of Korea. A total dinoflagellate cysts identified were 33 species, which belonged to 17 genera, 31 species, and 2 unidentified species. A cysts density were 16-1,501 cysts-gdry$^{-1}$. The dominant species of dinoflagellate cysts in the Southwestern Sea of Korea were Spiniferites bulloideus and Scrippsiella trochoidea, which are autotrophic species. To investigate the environmental characteristics of the Southwestern Sea of Korea using the dinoflagellate cysts, a principal component analysis (PCA) was conducted using the data collected from a total of 51 stations. From the score distribution map by the PCA, the Southwestern Sea of Korea was largely divided into three regions according to the first primary component and the second primary component. In other words, Group 1 was the western sea area of Mokpo and Jindo, Group 2 was the outer sea area of the South Sea, and Group 3 was the coastal areas of the South Sea around the Archipelago. It was found that this division of sea area was influenced by effects of the sea environment of the coastal areas of Korea. The coastal areas of Mokpo and Jindo that belong to Group 1 were affected by the cold Yellow Sea water. The outer sea area of the central parts of the South Sea that belong to Group 2, which is the boundary between the Southern coastal water of Korea and the Tsushima warm water, was subject to the formation of temperature fronts throughout the year, while Group 3 was affected by the coastal waters of Korea. It was also found that this division was in close relationship with the distribution of sediment facies in the bottom layer. From the above results, the environmental factors that influence the cyst distribution in he Southwestern Sea of Korea were found to include the eutrophication status of the sea area, the physical characteristics of the sea environment such as the flow of sea current and fronts, the sediment facies in the bottom layer, and the appearance volume of motile cells.