• 제목/요약/키워드: southwestern sea of Korea

검색결과 218건 처리시간 0.027초

한국 남서해역에서 조석전선의 변동과 저수온역 확장기작 (Fluctuation of Tidal Front and Expansion of Cold Water Region in the Southwestern Sea of Korea)

  • 정희동;권철휘;김상우;조규대
    • 해양환경안전학회지
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    • 제15권4호
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    • pp.289-296
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    • 2009
  • 본 연구는 장기 해양관측(1966-1995)자료, 위성관측자료 및 수치모델기법을 이용하여 한국 남서해역에서 하계에 형성되는 조석전선괴 저수온역의 시공간적 변화를 파악하였다. 한국 남서 연안해역에서는 6월과 8월에 대흑산도~진도간 해역의 표면에서 주변 해역보다 $2{\sim}3^{\circ}C$ 낮은 저수온역이 분포하면서 조석전선역이 형성됨을 확인할 수 있었다. 수온수평경도가 $0.3^{\circ}C$/km 이상인 조석전선은 성층계수 2.0~2.5 범위이며, $0.03^{\circ}C$/km 이상인 저수온역은 성층계수 2.5~3.0의 범위와 일치하였다. 소조시에서 대조시까지 조석주기가 변하는 동안 조석전선의 위치변동은 전선은 25~75km, 저수온역의 범위는 60~90km로 조류의 세기에 정비례하여 이동 범위가 커지는 것으로 나타났다. 또한, 남서쪽 외해역으로 저수온역이 확장되는 원인은 진도 남서쪽으로 향하는 10cm/s 이상의 강한 조석잔차류에 의한 것으로 판단된다.

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황해 연안습지 생태계 보전을 위한 초국경협력 방향 - 갯벌의 세계자연유산 등재를 중심으로 - (Pan-Yellow Sea Cooperation for the Conservation of Ecosystems in Coastal Wetlands of Yellow Sea - Focusing on the World Natural Heritage of coastal wetland-)

  • 최현아;한동욱
    • 한국습지학회지
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    • 제25권3호
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    • pp.213-219
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    • 2023
  • 기후변화 위기상황에서 습지 생태계의 기후변화 완화 및 적응 기능이 더욱 강조되고 있으며, 탄소흡수원으로서 갯벌의 생태계 서비스가 중요시되고 있다. 현재 황해지역 갯벌 중 남한과 중국의 경우 UNESCO 세계자연유산 2단계 등재를 위한 준비를 하고 있으며, 향후 황해지역 갯벌을 통한 남북한 및 중국의 초국경협력이 기대되는 상황이다. 그러나 이동성 조류 서식지, 휴식지, 중간기착지로서 황해지역 갯벌의 중요성과 보전, 관리, 남북한 및 중국의 협력체계에 관한 연구는 부족한 상황이다. 이에 본 연구에서는 UNESCO 세계자연유산으로 등재된 남한의 서남해안 갯벌과 중국의 옌청자연보호구, 잠정목록에 등재된 북한의 문덕 습지보호구를 포함한 황해지역 갯벌을 중심으로 남북한 및 중국의 생태계 보전 협력 여건을 분석하였다. 이를 바탕으로 이동성 조류 서식지, 휴식지, 중간기착지로서 황해지역 갯벌의 중요성과 황해 연안습지 주요 특징, 북한과의 협력여건 등을 분석하여 황해 연안습지의 초국경보전지역 등재를 위한 생태계 보전 협력 방향을 제시하였다

서남해안지역(西南海岸地域)의 지형발달(地形發達)에 미친 지질조건(地質條件) (Effects of Geological Conditions on the Geomorphological Development of the Southwestern Coastal Regions of Korea)

  • 김서운
    • 자원환경지질
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    • 제4권1호
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    • pp.11-18
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    • 1971
  • The geotectonics and geomorphic structure of Korea resulted from the Song-rim Disturbance and the Daebo orogenic movements. Afterward this mountainous peninsula underwent several geological changes on a small scale, and it was also claimed that the steady rising of the elevated peneplain of the eastern coast and the submerging of the southwestern coastal area are largely due to the tilted block movement. These views have been generally accepted good in several ways, but they are limited in range or lacking in theoretical integration. The present writer investigated the geology of the Mt. Chi-ri-san and the Honam coal mining area for a geological map in 1965, respectively. The results of these studies convinced the present writer that the conventional views, which were based upon a theory of lateral pressure should be reconsidered in many respects, and more recent studies made it clear that the morphological development in the southwestern area can be better explained by the orogenic movement and rock control. The measurement of submerging speed of the western coastal area (Pak. Y. A., 1969) and a new account on the geology and tectonics of the Mid-central region of South Korea (Kim O.J., 1970) act as an encouragement to a new explanation. The present writer's researches on the extreme southwestern portion of the peninsula show that the steady submerging of this area cannot be attributed to a simple downthrown block phenomenon caused by block movement. It is no more than the result of the differential movement of uplifting in the eastern and western coastal areas and the rising of sea-level in the post-glacial period. This phenomenon could be easily explained by the comparison of the rate of rise in sea-level and amount of heat flow between Korea and other areas in the world. The existance of the erosional planes in the Sobaik-San ranges also provide an evidence of an upheaval in the western coast area. Though the Sobaik-San ranges largely follow the direction of the Sinian system. They consist of the numerous branches, whose trends run more or less differently from their main trend because of the disharmonic folding, are converged into Mt. Sobaik-San and Chupungryung. The undulation of the land is not wholely caused by orogenic movements, where as the present writer confirmed that the diversity of morphological development is the direct reflection of geological conditions such as rocks and processes which constitute the basic elements of geomorphic structure. An east-west directed mountain range which could be named as Hansan mountain range, was claimed to be oriented by the joint control. The geological conditions such as a special erosion and weathering of agglomerate and breccia tuff usually produce pot-hole like submarine features which cause the whirling phenomenon at the southwestern coast channel.

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Age Studies on the Butter Fish Population from Southwestern Waters of Korea

  • Han, Pyung Chin
    • 한국해양학회지
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    • 제8권2호
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    • pp.68-74
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    • 1973
  • The present paper concerns the age determination and growth of butter fish, Pampus argenteus from the southwestern waters of Korea by otolith reading. 743 specimens taken by stow-net in the southern part of the Yellow Sea and northeastern part of the East China Sea during the period from October 1972 to September 1973 were examined. Results of the study are summarized as follows: 1. Sex ratio of females to males was found to be 2:1. 2. Ring marks on the otolith were found to be formed twice a year, once during the period of January-May and the other time in September. 3. The Lee's phenomenon was observed on the otolith sample. 4. The relationship between the radius of otolith(R) and fork length(L) was found to be as follows: R=0.3069+0.0133L 5. Calculated fork length at the time of otolith ring formation are found to be as follows:I-ring,71.67mm; II-ring, 125.05mm; III-ring, 168.65mm; IV-ring, 201.74mm; V-ring, 225.80mm; VI-ring, 240.84mm. 6. Maximum fork length calculated according to the diagram of Walford's growth transformation was found to be 281.5mm. 7. Growth curve, when related to the von Bertalanffy's equation, was laid out as $L_{t}=281.5[1-e$^{-0.674(t-0.128)}]$

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남해 강진만 담수유입에 따른 체류시간 변화 모델링 (Modeling Variation in Residence Time Response to Freshwater Discharge in Gangjin Bay, Korea)

  • 김진호;박성은;이원찬
    • 한국수산과학회지
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    • 제54권4호
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    • pp.480-488
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    • 2021
  • The term residence time is defined as the time taken for substances in a system to leave the system and is a useful concept to explain the physical environment characteristics of a coastal area. It is important to know the spatial characteristics of the residence time to understand the behavioral properties of pollutants generated in a marine system. In this study, the spatial distribution of average residence time was calculated for Gangjin Bay, Korea, using a hydrodynamic model including a particle tracking module. The results showed that the average residence time was about 10 days at the surface layer and about 20 days at the bottom layer. Spatially, this was the longest residence time in the southwestern sea. There was no significant difference in average residence time at the surface layer due to freshwater discharge, but spatial variation at the bottom layer was larger. The average residence time at the bottom layer decreased in the southwestern area due to freshwater discharge and increased in the northern area. This result suggests that the residence time of anthropogenic pollutants may have a large spatial difference depending on the freshwater discharge, and thus the time taken to influence cultured organisms may also vary.

초여름 韓國 西南海域 植物플랑크톤의 群集構造와 分布 (Community Structure and Spatial Distribution of Phytoplankton in the Southwestern Sea of Korea, in Early Summer)

  • 심재형;박용철
    • 한국해양학회지
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    • 제19권1호
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    • pp.68-81
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    • 1984
  • 한국 서남해역에 있어서 식물플랑크톤의 군집구조와 분포를 밝히기 위하여 1980년 여름에 수평적, 수직적으로 채집한 정량 자료를 분석하였다. 연구해역은 상이한 水塊를 대표하는 상이한 3개의 특징적인 군집을 이루고 있음을 보여준다. 제 1 군집은 대부분 연안성 및 내수성 硅藻類로 구성되어 서남해의 연안 수역을 대표하며, 제 2 군집은 외양성 및 연안성 구조류와 2-3종의 鞭毛藻類로 구성되어 黑潮의 지류로 생각되는 高鹽 水性인 제주 부근의 수역을 대표한다. 제 3 군집은 주로 소형인 鞭毛藻류와 微細藻類로 구성되고 底鹽 수성인 중간 수역을 대표하는 것으로 나타났다. 또한 식물플랑크톤과 환경요인의 수직분포에서 세포수, chlorophyll-a, 및 용존산소등이 특히 계절적인 pycnocline 부근의 수층에서 높은 농도를 보여준다. nanoplankton은 군집내에서 90% 이상에 이를 만큼 점유율을 보여 중요성이 높음을 나타낸다.

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항공사진을 이용한 서남해 함평만의 해안선 변화 관측 (Observation of Shoreline Change Using an Aerial Photograph in Hampyung Bay, Southwestern Coast of Korea)

  • 조주환;김백운;임동일
    • 한국지구과학회지
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    • 제22권4호
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    • pp.317-326
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    • 2001
  • 한국 서남해안에 위치한 반폐쇄형 함평만 해안선은 대부분 높이 3m 미만의 급한 경사면을 가진 해안절벽으로 이루어져 있다. 해안절벽은 주로 연약한 풍화암 또는 적색 토양층으로 구성되어 있어 매우 불안정하며, 활발한 침식활동이 진행되고 있다. 1976년과 1990년에 촬영된 항공사진을 이용한 단사진 측정법(photogrammetry)을 통하여 이들 해안절벽 침식에 따른 해안선 변화(후퇴)를 정량적으로 계산한 결과, 함평만 해운리 해안선의 침식율(후퇴율)은 매년 1${\sim}$2m 정도로 계산되었으며, 이는 장 외(1999)에 의하여 현장에서 직접 관측${\cdot}$측정된 침식율과 일치하는 것으로 나타났다. 따라서 보 연구에서 적용한 단사진 측정법은 앞으로 해안선의 장기적 변화를 정량화하고 해석하는데 매우 유용한 방법으로 평가된다. 또한, 함평만에서의 활발한 해안침식은 간헐적으로 발생되는 고에너지의 태풍 및 폭풍에 의한 이상고조와 매우 불안정한 토양으로 구성된 해안절벽의 지질 특성 등의 복합적인 상호작용에 의한 것으로 해석된다.

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GIS기반 적지분석을 통한 조류-양수 융합발전시스템 설치후보지 도출 연구 (Derivation of Candidate Sites for a Tidal Current-Pumped Storage Hybrid Power Plant Using GIS-based Site Selection Analysis)

  • 이철용;최현우;박진순;김지훈;박준석
    • 한국지리정보학회지
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    • 제23권4호
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    • pp.184-207
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    • 2020
  • 본 연구에서는 GIS기반 적지분석을 적용하여 조류-양수 융합발전시설의 설치후보지역을 도출하는 것을 목표로 하였다. 연구대상지역은 진도 일대 서남해 해역이며, 융합발전시설의 설계 및 설치 특성을 고려하여 적지분석을 위한 고려인자를 도출하였다. MOHID(Modelo HIDrodin?mico)를 이용하여 조류 수치모의를 수행하였고, 모의 결과를 공간자료로 변환하였다. 이후 본 연구에서는 제안하는 GIS기반 중첩분석 방법을 적용하여 설치후보지역을 도출하였다. 연구 결과에서 총 10개 지역이 후보지역으로 도출되었으며, 이 중 진도, 성남도, 하조도가 상대적으로 넓은 해역에 대해 조류-양수 발전기 설치가 가능한 것으로 판단되었다.

Tracking the Movement and Distribution of Green Tides on the Yellow Sea in 2015 Based on GOCI and Landsat Images

  • Min, Seung-Hwan;Oh, Hyun-Ju;Hwang, Jae-Dong;Suh, Young-Sang;Park, Mi-Ok;Shin, Ji-Sun;Kim, Wonkook
    • 대한원격탐사학회지
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    • 제33권1호
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    • pp.97-109
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    • 2017
  • Green tides that developed along the coast of China in 2015 were detected and tracked using vegetation indices from GOCI and Landsat images. Green tides first appeared near the Jiangsu Province on May 14 before increasing in size and number and moving northward to the Shandong Peninsula in mid-June. Typhoon Cham-hom passed through the Yellow Sea on July 12, significantly decreasing the algal population. An algae patch moved east toward Korea and on June 18 and July 4, several masses were found between the southwestern shores of Korea and Jeju Island. The floating masses found in Korean waters were concentrated at the boundary of the open sea and the Jindo cold pool, a phenomenon also observed at the boundary of coastal and offshore waters in China. Sea surface temperatures, derived from NOAA SST data, were found to play a role in generation of the green tides.

Influences of Climate Factors and Water Temperature in Squid Spawning Grounds on Japanese Common Squid (Todarodes pacificus) Catches in the East (Japan) Sea

  • Lee, Chung-Il
    • Fisheries and Aquatic Sciences
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    • 제10권3호
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    • pp.150-158
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    • 2007
  • Data on squid catches, water temperature, and climatic factors collected for the Northwest and subtropical North Pacific were analyzed to examine the influence of oceanic and climatic conditions in spawning grounds on catches of Japanese common squid, Todarodes pacificus, in the East (Japan) Sea. The main spawning ground was divided into four sub-areas: the South Sea of Korea (R1), the southern waters off Jeju, Korea (R2), the southwestern part of Kyushu, Japan (R3), and the northern part of Okinawa, Japan (R4). Interannual and decadal fluctuations in water temperatures correlated well with squid catches in the East/Japan Sea. In particular, water temperatures at a depth of 50 to 100 m in sub-areas R3 and R4 showed higher correlation coefficients (0.54 to 0.59, p<0.01) in relation to squid catches in the East/Japan Sea than for R1 and R2, which had correlation coefficients of 0.40 or less (p>0.05). Air temperature and wind velocity fluctuations in each sub-area are correlated with water temperature fluctuations and were closely connected with variations in the surface mixed layers. Water, air temperatures and wind velocities at the main spawning grounds are linked to the Southern Oscillation Index (SOI) with higher signals in the ca. 2-4-year band. Strong changes in a specific band and phase occurred around 1976/77 and 1986/87, coincident with changes in squid catches.