• Korean Journal of Fisheries and Aquatic Sciences
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• v.30 no.5
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• pp.759-770
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• 1997

The general flow patterns in the Cheju Strait have been investicated by analyzing the current observations measured in $1986\~1989$ by current meter mooring in 3 north-south sections in the Cheju Strait and at 4 observation points around Cheju Harbour, and measured in $1981\~1987$ by drogue tracking. 1. In the Cheju Strait, there are eastward or northeastward residual currents, which implies that sea waters flow into through the whole western section and flow out through the whole eastern section in the Cheju Strait. The velocity of residual currents are $5.2\~30\;cm/sec$ in 10 m layer and $1.3\~24cm/sec$ in mid-bottom layer. Generally, the flow is strong along the deepest through and the northern part, and weak in the shallow areas near Chuja Islands and Bogil Island. 2. In the western entrance of the Cheju Strait, the observed mean residual velocity is 6.93 cm/sec and the volume transport is 0.384 Sv. There are a big discrepancy between the observed residual currents and the geostrophic currents. 3. Near the frontal areas northwest to Chuja Islands, warm and saline offshore waters, flow northward about 5 miles into the southern coastal areas of the Korean Peninsula in flood, and flow back rather eastward or southeastward than southward in ebb. So, warm and saline waters flow along coastal areas, being mixed with coastal waters. As a result, the northwestern area of Chuja Islands plays a role of the entrance of influx of warm and saline offshore water to the southwestern coastal areas of the Korean Peninsula. It should be stressed that this flow pattern is not due to the residual flows, but to the temporal (tidal) flows.

• Animal Systematics, Evolution and Diversity
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• v.4 no.2
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• pp.121-136
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• 1988

본 연구는 1969년 12월부터 1987년 10월까지 제주도의10개 지역 (제주항, 우도, 성산포, 표선, 서귀포, 숲섬, 화순, 가파도, 비양도, 한림)에서 채집된 표본들을 동정·분류한 결과(9과 31종)와 이미 발표된 종을 종합하여 제주도 연안의 유영목을 정리하였다. 그 결과 모두 11과 31속 45종이었다. 이들 중 4종 (Lepidasthenia berkeleyae, Brania clavata, Sphaerosyllis hirsuta 및 Ceratonereis singularis)은 한국미기록종이며, 13종은 제주도 연안에서만 발견되었다. 한국미기록종에 관하여는 그림을 그리고 기재하였다. 45종 중 난온수형이 22종 (48.89%)으로 가장 많았고, 범세계형이 10종(22.22%), 열대수형이 8종(17.78%), 냉온수형이 4f종(8.89%), 냉수형이 1종(2.22%) 의 순으로 나타났다. 난온수형이 가장 많이 나타난 현상은, 제주도가 위치하고 있는 해형, 즉 쿠로시오 난류의 영향을 크게 받고 있다는 사실과 부합된다.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.38 no.1
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• pp.1-10
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• 2002

Biomass distribution of zooplankton showed its lowest level in June in the Cheju Strait, and the highest one was noticed in November when the secondary productivity is considered high. The highest biomass of zooplankton appeared in the sea areas of Sta. 14 and 11 respectively with relation to oceanographic conditions and wet weight of biomass. The positions were the center part of the Cheju Strait, while the sea area of the South Sea of Korea and the northern coast of Cheju Island showed relatively low biomass distribution. The characteristic of the sea area where biomass was densely distributed was it was in patch shape. Meanwhile, biomass distribution was higher in the northern sea area of Cheju Island than In the coastal sea of the South Sea of Korea. It shows formation of hairtail fishing grounds is closely related to biomass distribution in the Cheju Strait. In addition, high biomass is displayed in the center part of the saddle shaped ocean, a boundary of the heterogeneous water mass as a feature of fall oceanographic condition. Good fishing grounds of a hairtail In the Cheju Strait were formed outside of the sea area that showed patch-shaped high biomass distribution.

• Korean Journal of Ichthyology
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• v.19 no.2
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• pp.160-163
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• 2007

Based on six specimens collected from eastern coast of Jeju Island, Korea, Istiblennius dussumieri is described as a new Korean record representing the northernmost occurrence of the species in the Indo-Pacific Ocean. The species is characterized by having a dark spot between first and third dorsal spines, branched orbital cirrus, and lacking nape cirri. A new Korean name, "Geom-eun-jeom-be-do-ra-chi" is proposed for the species.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.27 no.5
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• pp.515-528
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• 1994

China Coastal Water(CCW) appeared in the neighbouring seas of Cheju Island has been analyzed and the results are as follows: The water with salinity below $32.20\%0$ in the neighbouring seas of Cheju Island in summer is thought CCW. During the period from April 1985 to August 1986, salinity of more than $34.00\%0$ was appeared in the Cheju Strait during January to mid May, but it decreased gradually from late May. CCW with salinity below $32.20\%0$ appeared in the Cheju Strait in early July and disappeared in October. The mean thickness of CCW in the Cheju Strait was about 25m and CCW had an influence of up to about 50m depth. And stratification structure of the Cheju Strait in summer was halocline between the surface and 50m depth and homogeneous salinity layer below 50m depth. It seems that although CCW appears in the wide area of neighbouring seas surface of Cheju Island in summer, the core of this CCW which has the lowest salinity flows into the Cheju Strait from the western seas of Cheju Island. This CCW flows out the east through the central part of the Cheju Strait and then seems to be transported further in the form of eddy.

• Environmental Analysis Health and Toxicology
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• v.17 no.4
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• pp.341-346
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• 2002

To investigate the residue of organophosphorus pesticides such as Monocrotophos［Dimethyl-1-methyl-2-methyl carbamoylvinylphosphate］and EPN［O-ethyl-O-4-nitrophenyl phenylphosphonothioate］in the coastal environment of Cheju island, samples of sea organism, water and sediment were collected at the Sackdaldong and Daepodong near the Jungmoon golf course in July and Aug. 1997. The qualified detection limit of mono-crotophos and EPN by GC -FPD were 0.024 ng/g and 0.020 ng/g in the sea organism, respectively Neither Monocrotophos nor EPN was detected in seaweed cava (Ecklonia cava), Agar (Gelidium amansii), turban sell (Batillus cornutus) and sea urchin (Anthocidaris Crassispina). They were not detected in seawater and sediment, either. These results showed that the coastal area near the Jungmoon golf course in the Cheju island was not polluted by the organophosphorus pesticides such as Monocrotophos and EPN.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.6B
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• pp.617-625
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• 2010

The selection of a site where strong wind blows is important to increase effectively the electricity of wind power in proportion to the cube of the wind speed. It is advisable to establish the wind turbine in the coastal area with strong wind speed rather than in the inland. And the development of offshore wind energy is expected to solve the noise problem that is one of the important weaknesses in the wind turbine. In the process of the development business of wind energy, knowing forehead the wind power possibility in any area is one of the essential factors to choose the most optimum site of wind power. In this paper, the potential of wind power around JeJu coastal area is examined by using the wind data that Korea Meteorological Administration has surveyed for 10 years in 14 observation points. Wind speed data is revised to wind speed in 80 meters assuming installation height of the wind turbine, and wind power density and annual wind energy are also calculated. And annual electricity generation and percent of energy efficiency in all the observation points are estimated by using the information about 3,000 KW wind turbine.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.16 no.4
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• pp.299-304
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• 1983

A tongue-like warm water which is a part of the Tsushima Warm Current appears whole year around in the east entrance of the Jeju Strait. Because of this warm water, the current direction flowing into the Jeju Strait from its west area seems to be changed in the Jeju Strait. Therefore the intermediate and bottom water of the Jeju Strait may greatly influence the formation of the coastal water in the South Coast of Korea. Since this tongue-like warm water is stronger in winter than in summer in its formation, Tsushima Warm Current comes closer to the South Coast of Korea in winter and its north boundary frequently approaches close to the coast of Geomun Island and Sori Island.

• Korean Journal of Ichthyology
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• v.32 no.4
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• pp.251-256
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• 2020

We described the first record of Callogobius shunkan from Korea, based on two specimens (54.9~66.1 mm in standard length) collected from the southern coastal waters of Jejudo Island. These specimens were characterized by prominent papillae ridges on the head, including postnasal and postorbital rows, well-developed pelvic frenum, dark brownish head, scattered whitish flecks on the body, and three blackish spots on the basal portion of dorsal fins. We proposed a new Korean name, "Ju-reum-mang-dug" for the species.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.31 no.3
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• pp.437-446
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• 1998

The general pattern of the hydrographic conditions and tidal front of the northern coastal area of Cheju Island is investigated using the CTD observation data and a stratification parameter V ($J/m^3$) in $1991\~1993$. 1. The sea water of the northern coastal area of Cheju Island has a lower temperature and higher salinity than that in the central area of the Strait, and local temperature and salinity fronts appears frequently around this area. It seems that they are caused by the upwelling and the tidal front as well as a local topography. 2. A saddle-like distribution of temperature and salinity is formed in the Cheju Strait almost every month with relation to mixing of the different water masses. 3. In the northern coastal area of Cheju Island the stratification parameter V ($J/m^3$) was ranged from 8.4 to 209.8 $J/m^3$ in June, 201.9 to 634.9 $J/m^3$ in August, 0.18 to 680 $J/m^3$ in September, and $2.7\~462\;J/m^3$ in October, respectively. The tidal front was often formed around the place where the horizontal variation of the depth is very large and the potential energy with 10$J/m^3$ appears roughly along 50 m isobath.