• 한국수산과학회지
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• 제16권4호
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• pp.368-378
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• 1983

본 연구는 1982년 6월부터 1983년 5월까지 전남 여수반도 남단에 위치한 오동도 해조군락의 특성을 밟히기 위하여 5개의 line transect를 설치하고 연간 계절별로 조사된 자료를 분석 하였다. 해조류의 수직분포는 상부군이 Gelidium divaricatum, Enteromorpha linza, Porphyra yezoensis, Scytosiphon lomentaria, Blidingia nana, Ectocarpus confervoides, 중부군이 Ulva pertusa, Chondria crassicaulis, 그리고 하부군은 Sargossum sagamianum, Undaria pinnatifida, Sargassum thunbergii 및 Gelidium amansii 등의 홍조류로 대표되었다. 출현해조의 종수와 피도는 4월에 최대이고 8월에 최소로되며 종별 우점도의 변화는 연중 출현종은 10월에, 일계절 출현종은 1월 또는 4월에 각각 최대치를 나타내었다. 유사도지수에 따른 5개 transect의 cluster analysis 결과 내만성군과 외양성의 2군으로 분류되었으며 본 지역은 남해안 중${\cdot}$동부 군락에 해당되는 Myelophycus simplex alliance의 Colpomenia sinuosa-Ecklonia cava association에 속한다고 본다.

• International Union of Geodesy and Geophysics Korean Journal of Geophysical Research
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• 제23권1호
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• pp.39-51
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• 1995

Bidirectional transport trend using the sediment-transport path model was identified in the two areas, sand ridge area and tidal mudflat in Garolim Bay, which is located in the mid-western coast of Korean Peninsular. This model exhibits the two-dimensional view of clear sediment transport trend based on data of changes in sediment statistics such as mean, sorting, and skewness, Garolim Bay was selected to test for the sediment-transport path model developed by McLaren and Bowles [1985]. Line-S, a typical tidal mudflat and representative of the Garolim Bay tidal flats, is well tested by this model, showing a clear seasonal change and coarsening-trend seaward (case C). This indicates that strong ebb currents carried relatively coarser sediments seaward with respect to high energy regime. Seasonally, this energy regime slowly decreases toward the summer in contrast with an increase of energy regime of flood tides, carrying coarser sediments landward (case C) in the summer. However, the Line-D area does not show consistent transport trend with respect to time-series. Separated and scattered events show fining trend landward (case B) in the sand ridge itself. The finining-trend (case B) either seaward and landward is not chiefly important in both the entire Line-D area and sand ridge itself. Also, the coarsening-Trend (case C) landward is not significant in the sand ridge itself. Consequently, in reality, the selection of suitable and representative locations are very important to fit with this model.

• 수산해양기술연구
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• 제58권4호
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• pp.310-316
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• 2022

Giant pacific octopus, Enteroctopus dofleini, is a large mollusk distributed in the East Sea of Korea. In this study, the catch status of giant pacific octopus by drift line fishery and the effect of sea temperature on fishing ground were investigated in Goseong-gun, Gangwon-do, which is the central coast of the East Sea. The average catch of giant pacific octopus in Gangwon-do was 1,570 tons over the past ten years, and it accounted for 21% in 2008 and 44% in 2021 compared to the total catch in the East Sea during the same period. Such data indicates that the catch in Gangwon-do has recently increased. In this study area, giant pacific octopus weighing 1.1-5.0 kg dominated accounting for 56% of the total individuals, and followed by those weighing 1 kg or less. However, the ratio of catch of giant pacific octopus over 5.1 kg tended to increase in 2021, which is thought to be related to the sea temperature that affected the fishing ground. The main depth of fishing ground was from 21 m to 50 m in this area and fishing grounds were widely distributed throughout the season except summer. Fishing ground was formed with the conditions of bottom sea temperature under 10℃ and was diminished by moving of giant pacific octopus to deeper depth with conditions of bottom sea temperature over 18℃.

• 한국지구과학회지
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• 제28권7호
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• pp.914-924
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• 2007

한반도 동해에서 자연 상태의 해빈(낙산-오산 해빈)과 인공구조물이 설치된 해빈(안목-염전 해빈)의 퇴적물을 조사하고 두 해빈간의 차이를 확인하기 위하여 2004년 홍수기와과 2005년 갈수기에 해빈의 후안 및 전안에 대해 걸쳐 조사를 실시하였다. 낙산-오산 해빈의 후안 및 전안에서는 해빈 남측으로 가면서 평균입도가 세립해지고 분급이 양호해지는 등 퇴적상과 조직변수가 일정하게 변화하였으며 계절간의 변화가 크지 않았다. 그러나 안목-염전 해빈은 낙산-오산 해빈에 비해 후안 및 전안의 평균입도가 조립하고 분급이 불량하며 양의 왜도 값이 많았고 연근해를 포함하여 조직변수의 전체적인 변화 경향성을 찾기가 어려웠다. 이러한 두 해빈의 특징은 해안을 따라 흐르는 연안류가 해안선의 형태에 따라 변화하고 이로 인해 퇴적물의 특성에 영향을 주었기 때문으로 생각된다. 특히 안목-염전 해빈은 인공구조물(안목항)이 연안류의 흐름을 막아 자연 상태와는 다른 퇴적환경의 변화를 일으키는 것으로 생각된다. 또한, 안목-염전지역은 항만의 공사가 추가로 계획되어 있어 향후 지속적인 변화가 있을 것으로 예상된다.

• 한국환경복원기술학회지
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• 제16권1호
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• pp.55-69
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• 2013

The phytosocialogical study on the coastal sand dune vegetation of the East Coast was carried out. 180 phytosociological relev$\acute{e}$s of 62 sites in the East Coast were used in this study. In addition, already published syntaxa and the phytosociological hierarchy in Korea and Japan were used and comparative analyses of syntaxonomy, synecology, syngeography, and syndynamics were performed in the study. In this study, the flora was investigated 30 families, 66 genera, 77 taxa and 3 vegetation types were identified : the coastal drift-line annual communities (Calystegio soldanellae-Salsoletum komarovii), the dune glasslands communities (Elymo-Caricetum kobomugi, Carex kobomugi typical community, Elymus mollis community, Calystegia soldanella community, Zoysia macrostachya community, Cynodon dactylon community, Carex pumila community), and the dune shrubs communities (Linario-Viticetum rotundifoliae, Vitex rotundifolia community, Rosa rugosa community). The aspect of transition in the coastal sand dune vegetation of the East Coast were identified as follows : (1) reduced constancy degree and cover degree of Glehnia littoralis in each community; (2) lack of Ischaemum anthephoroides in Linario-Viticetum rotundifoliae (3) simplified species composition in Vitex rotundifolia community. Unstable habitat condition by external interference seemed to has caused the reduction of 2 taxa, Glehnia littoralis and Ischaemum anthephoroides, that usually grow in the second dune. In addition, we found changes in the distribution of the dune shrub communities influenced by rising temperature of the East Coast as results of the global warming. The results on the distribution of the dune shrub communities in this study demonstrated that the limit of the Rosa rugosa community made $0^{\circ}$ 44'N to the North and the vegetative limit of the Vitex rotundifolia community made $0^{\circ}$ 28'N to the North, respectively compared with the previously phytosociological studies. This study investigated the coastal sand dune vegetation, syntaxonomy, habitat condition and human disturbunce of the East Coast, and this will provide important information as basic data for the coastal ecosystem.

• 한국수산과학회지
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• 제37권2호
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• pp.129-136
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• 2004

Visual line-transect surveys for the finless porpoise (Neophocaena phocaenoides) were conducted in the offshore of the west coast of Korea (WCOK) from 18 April to 17 May 2001 $(34^{\circ}18'\;to\;37^{\circ}18'N,\;123^{\circ}00'\;to\;126^{\circ}00'E),$ and in the inshore of the west coast of Korea (WCIK) from 29 July to 2 August 2003 $(35^{\circ}17'\;to\;36^{\circ}17'N,\;126^{\circ}00'\;to\;126^{\circ}25'E).$ A total of transect survey efforts were 810.27 n.m. in 2001 and 216.09 n.m. in 2003, which cover a survey areas of $23,012\;n.m^2\;and\;1,550\;n.m^2,$ respectively. There were 76 and 24 sightings for the finless porpoise during the surveys in the WCOK (2001) and the WCIK (2003), respectively. More than $80\%$ of the finless porpoise occurred near the coast within 15 n.m. from the land. Porpoise were observed mainly in a depth range from 20 to 50 m $(78\%).$ Few porpoise were observed in a depth shallower than 10 m or deeper than 60 m. The hazard-rate model, truncated at the largest $5\%$ distance, showed the best fitting from the frequency distribution of perpendicular distance of the finless porpoise sighted from the trackline in the WCOK (2001), while the uniform model showed the best fitting from in the WCIK (2003). Abundance of finless porpoises were estimated to be 58,650 individuals ($95\%$ CI=34,961-98,389) in the WCOK (2001) and 1,571 individuals ($95\%$ CI=881-2,800) in the WCIK (2003), respectively.

• 한국지구과학회지
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• 제36권6호
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• pp.533-542
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• 2015

고창 해빈은 황해의 동편, 한국 서남해 연안에 위치하며, 북쪽에서 남쪽 방향으로 동호리, 광승리, 명사십리 해빈으로 구성된다. 고창 해빈은 대조차, 개방형, 직선형 해안, 모래 저질의 특징을 보인다. 본 연구는 고창 해빈에서 표층 지형 변화와 퇴적물 집적률의 연평균과 계절 특성을 연구하였다. 2014년 겨울(2월), 봄(5월), 여름(8월), 가을(11월)과 2015년 겨울(2월)의 5계절 동안, 3개 측선을 따라 총 315개 지점에서 지형 고도를 측정하였다. 해안선에 수직인 각 측선은 30 m 간격의 21 지점으로 구성된다. 고창 해빈의 2014년 연평균 집적률은 -0.081 m/yr로 침식이 우세하였다. 지역별 연평균 집적률은 동호리 해빈 -0.091 m/yr, 광승리 해빈 -0.051 m/yr, 명사십리 해빈 -0.10 m/yr로 나타났다.

• 한국해양학회지:바다
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• 제7권3호
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• pp.148-156
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• 2002

서해 남부 함평만에서 해안선의 지형 특성과 해안절벽의 침식과정을 조사하기 위해 야외관찰과 정밀 측량을 실시하였다. 함평만 해안선은 급경사면 그리고 불안정한 토양층이나 연약한 풍화암층으로 이루어진 높이 l0m미만의 해안절벽(sea-cliff)들로 대부분 구성되며, 매우 활발한 침식을 받고있다. 톱날모양의 해안선 형태, 해빈 표면에 노출된 잔류풍화기반암 및 "Island Stack"등 독특한 해안선 지형 특성들이 활발한 해안침식 증거들로 나타난다. 함평만에서의 해안선 후퇴는 해안절벽 기저부의 침식 사태(landslide or mass wasting), 테일러스(talus)형성 그리고 테일러스의 침식(소멸)의 순차적 과정이 반복되어 나타난 결과로 해석된다. 본 연구에서 테일러스가 여름철에 침식.제거되는 현상은 정상적인 해양조건에서 일어나는 계절적 해수면 상승에 의한 것으로 판단된다. 이는 겨울철 폭풍과 함께 해안 침식의 또 다른 중요 요인으로 제시된다.요인으로 제시된다.

• 한국환경과학회지
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• 제9권3호
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• pp.215-221
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• 2000

The relationship between the distribution of sea surface temperature(SST) and dinoflagellate(Cochlodinium polykrikoides) bloom areas were studied. The SST data were derived from the infrared channels of AVHRR(Advanced Very High Resolution Radiometer) sensor on NOAA(National Oceanic and Atmospheric Administration) 12 and 14 satellites during 1995-1998. The initial water temperature at C. polykrikoides bloom was about 21${\circ}C$ at the coastal areas of the South Sea and along the shore of the East Sea of Korea during the summer season of 1995. The northern limit of red tides was coincident with that of 21${\circ}C$ isothermal line in the East Sea. The red tides that initially bloomed at the coast of Pohang on September 21, 1995 moved to the coast of Uljin on September 26, 1995. The skipped appearance of the red tides in the areas between Pohang and Uljin was due to the East Korean Warm Current, which was moving offshore from Pohang to approach to Uljin. The cold water which was formed by tidal front in the western coast of the South Sea and by upwelling water from deep layer in the southeastern coast of the Korean peninsula played a role in blocking the spreading of red tides during summer season in 1997 and 1998. In conclusion, the distribution of red tides appeared to be dependent on the initial water temperature at red tides bloom. The SST at the red tides varied from 21${\circ}C$ to 25${\circ}C$; 21${\circ}C$, 23${\circ}C$, 24 and 24-25${\circ}C$ in 1995, 1996, 1997 and 1998, respectively.

• 한국지형학회지
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• 제25권1호
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• pp.1-17
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• 2018

The characteristics and burial ages of sand sediments on the Jiduri coast in Daechung-myeon, Ongjin-gun, Incheon were investigated. Daecheong Island is the area where the characteristics of the rocky coast and sand coast are shown. Various studies have been conducted on the Okjukdong sand dune that appears in the north of the island. However, there has been no study on the sandy sedimentary topography of the Jiduri and Moraewul area in the south. The sandy sedimentary terrain of Jiduri is divided into sandy beaches, sand dunes and sand deposits along the slope including climbing dune. Overall, the depth of sandy sediments in Jiduri is not deep. The characteristics of sandy sediments and burial ages were investigated at an elevation of about 23 m above sea level at the back of Jiduli Beach and 46 m above sea level at the ridge line between Jiduri and Moraewol. From the Jiduri coast to the hillside behind, the average grain size decreases and the sorting becomes better as it moves from the intertidal zone to the beach and the foredune. This indicates the selective sand transport by the wind and can be judged by the terrain formed under the current sedimentation environment. The average grain size at the upper part of the section of JD-1 (elevation of about 23m MSL) was $1.6918{\varphi}$ of medium sand. The sorting was $0.4584{\varphi}$, skewness was -1.0491 and kurtosis was -1.2411, respectively. Particularly, the average particle size of the crosssection issomewhat uniform, but the color of the constituent material changes from brown to black. In the case of JD-2 (about 46 m MSL), the mean grain size of the section was $1.7943{\varphi}$, the sorting was 0.4931, the skewness was -1.1163, and the kurtosis was 1.2133. On the other hand, the brown and black layers of JD-1 exhibited a burial age of $0.1{\pm}0.0ka$ and the JD-2 had a burial age of $0.7{\pm}0.0ka$.