• 한국환경과학회지
• /
• 제5권4호
• /
• pp.411-427
• /
• 1996

A Lagrangian dispersion model has been developed to study the transport of atmospheric pollutants over the southern Korean peninsula on sunny summer days. A mesoscale atmospheric model has been employed to provide the wind fields and information for turbulent diffusion for the calculation of trajectories using a conditioned particle technique. The model has been applied to the simulation of the transport of atmospheric pollutants emitted from five sources in the coastal locations under various synoptic scale winds. Under calm synoptic scale condition, the particles emitted during daytime are mixed vertically and transported toward inland by sea-breeze, according to the model simulation. The particles are then transported upward at she sea-breeze front or by the upward motion over the mountain, and some particles show tendency of returning toward the coast by the return flow of the sea-breeze circulation. The particles are found to remain over the peninsula throughout the integration period under calm synoptic scale condition. When there is westerly synoptic scale winds the particles emitted in the west coast can reach the east coast within a day of faster depending on the speed. With a synoptic scale southerly wind of 5 m/s, most of the particles from the fine sources are advected toward inland during daytime. During nighttime, significant portion of particles released in the west coast remains over the land, while most particles released in the east coast move toward the sea to the east of the middle peninsula.

• 환경생물
• /
• 제32권4호
• /
• pp.353-362
• /
• 2014

이번 연구는 한국산 지충이 [Sargassum thunbergii (Mertens ex Roth) Kuntze]의 지리적 형태변이를 확인하고, 형태변이에 따른 품종의 구분에 대하여 분류학적 재검토를 시도하였다. 동해, 서해와 남해안에 분포하는 지충이 개체군의 지리적 형태변이를 조사하기 위해서 개체가 가장 성숙한 시기인 봄철에 채집하였다. 지충이의 관찰대상 형질은 부착기, 줄기의 길이와 직경, 체장, 중심가지의 직경, 마디간격, 측지의 길이와 직경, 잎의 길이와 폭 및 두께, 기낭의 길이와 직경, 기낭 자루와 기낭 돌기의 길이, 생식기탁의 길이와 직경, 질감이었다. 서해안의 지충이는 엽체가 짧고 가늘며, 마디간격이 넓어서 성긴 느낌이고 질감이 부드러워 다른 두 해역의 지충이와는 다른 형태적 특징을 보였다. 동해안의 지충이는 체장이 서해안의 것과 비슷하지만 중심가지와 측지가 굵어서 질감이 거칠고, 측지가 없거나 매우 짧은 것도 있으며, 잎과 기낭이 다른 해역에 비해 컸다. 남해안의 지충이는 체장과 측지가 가장 길고 잎과 기낭이 짧은 것이 특징이었다. 동해안 북부에서 채집된 개체들은 f. latifolium과 형질이 유사하였다. 그러나 다른 해역에서는 네 품종의 원기재와 정확히 일치하지 않아 품종을 구분하는 식별형질은 한국산 지충이의 형태 변이에 적용할 수 없었다. 따라서 생육지에 따라 나타나는 지충이의 다양한 형태변이는 종 이하의 분류군으로 나누는 것보다는 생육지 환경조건에 따른 변이체로 보는 것이 타당할 것으로 사료된다.

• 한국지반환경공학회 논문집
• /
• 제16권7호
• /
• pp.15-22
• /
• 2015

본 연구는 국내 해역별 준설토의 침강압밀 특성 및 투기장 내 매립된 준설매립토의 표층강도 특성을 조사하였다. 준설토의 자중압밀특성 분석을 위하여 Column test를 수행하고 그 결과를 기존의 문헌자료 및 해역별 준설토 투기장 설계 자료와 비교 분석하였다. 또한 휴대용 콘 관입시험기를 이용하여 서해 및 남해 연안 주요 매립지에서 현장시험을 수행하고 준설토의 매립 후 표층강도를 분석하였다. 분석결과 침강압밀계수는 남해안 지역의 준설토가 서해안 준설토 보다 초기 함수비에 대해 좀 더 예민하게 변화하는 것으로 나타났으며, 준설매립지의 표층강도는 서해안이 남해안보다 큰 강도 값을 나타내었다. 이러한 연구결과는 준설매립분야의 해석 및 설계를 위한 중요한 자료로 활용 가능할 것으로 사료된다.

• 수산해양교육연구
• /
• 제11권1호
• /
• pp.24-42
• /
• 1999

I have studied historical transition process of fisheries industries, fisheries Institute in abreast of developing fisheries industries of west coast of Korea since 1910 year with regard to the Gogunsan Is. The results were summarized as follows. In 1910 year, fishery industry has been carried out shifting fishing gear e.g set-net in shallow waters, small stow net, small seine net adapting to the tophorgrapical feature, shape of coast, oceanic condition, however, the fishing gear and fishing method were undeveloped, so that, Japanese fishermen had been exploited fisheries resources penetrating the fishing ground. Most important species were lot of captured croaker, cod, spanish mackeral, sea abream, herring in coastal sea. nowaday, squid, anchovy, shrimp, crab, pompret were much captured. The species were captured in 18 century were not captured. It is rarely than that period. Fishereis aquatic culture had been not farmed till 1960 year, but sea laver, shrimp, crab, had been breeded 1970 year also, the fresh water fish e.g. eel, cat-fish had been breeded activately. The fisheries processing industry were composed of salt. icing, dry, method. the salted fish industry had been prevailed at Gangyng, Kwangchon, Kunsan, Julpo comparatively. The fisheries institute had been established at Kunsan at first, but institute established in other region had been abolished in a short time. This phenomenon was related with development of fisheries resources. The western coast fisheries industries had been wasted of decreasing of fisheries resources, variation of environment. Accordingly, the study of preserving the marine resources. educated man power who engaged in fisheries field have to accomplish. Sea was dying with reason of loss of mud in west coast factory waste, waste of life the increase of accident of sea polluted, each illegal fishing industry physical and chemical reason etc. in this respect, Kusan maritime college, fisheries developing agency, institute have to take important role for developing fishing industry.

• International Journal of Advanced Culture Technology
• /
• 제11권1호
• /
• pp.349-355
• /
• 2023

This study surveyed the island located in Sinan-gun and Wando-gun four times, once per season from September 2020 to November 2021 in order to understand the distribution of waterbirds on the island of the southwest coast. As a result of the investigation, a total of waterbirds of 7 orders, 12 families of 50 species, and 3,680 individuals were identified. By taxon, the largest number of species were identified as 11 species of waders, and the number of ducks was the largest with 2,035 individuals. In Bigeum-do Island, where forests are distributed less, the proportion of farmland is large, and tidal flats are widely distributed, the largest number of species and individuals of herons and waders were identified. Ducks and gulls have also been identified in large numbers of individuals in Bigeum-do Island. Most of them are forests and farmland, and the largest number of species and individuals of ducks have been identified in Pyeongil-do Island, where the coast is deep. In addition, Nodae-do Island, Sobyeongpung-do, and Daebyeongpung-do Island with monotonous habitats have been identified with fewer species and individuals. As a result, We learned that various types of waterbirds lived in islands with various habitats, and that the preferred habitat was different depending on the characteristics of the taxon group. By season, the largest number of species was identified as 35 in autumn, and the largest number of individuals was identified as 1,681 in winter. Although most of the seasonally identified waterbirds were winter birds, the largest number of species were identified in autumn, and most of the confirmed waterbird migration were identified in the autumn, indicating that waterbirds used the west-south coast islands as an intermediate stopover while traveling.

• Journal of Korean Society for Atmospheric Environment
• /
• 제20권E1호
• /
• pp.1-14
• /
• 2004

Meteorological mechanisms in association with long-range transport of Asian dust in April 2001 have been investigated using weather maps, satellite images, TOMS and surface $PM_{10}$ data, backward trajectories, plus modeling output results (geopotential heights, horizontal wind vectors, potential temperatures, and streamlines). The results indicated that long -range transport of Asian dust to the west coast of North America was associated with strong westerlies between the Aleutian low and the Pacific high acting as a conveyor belt. Accelerating westerly flows due to cyclogenesis at the source regions over East Asia transported pollution from the continent to the central Pacific. When the system reached the Aleutian Islands, the intensity of troughs and the westerlies were amplified in the North Pacific. Thereafter the winds between the Aleutian Islands and the Pacific Ocean were more intensified from the air flow transport of the conveyor belt. Consequently, the strong wind in the conveyor belt enhanced the dust transport from the Pacific Ocean to the west coast of North America. This was evidenced by $PM_{10}$ concentration (maximum of about $100{\mu}g\;m^{-3}$) observed In California. Further evidence of the dust transport was found through the observation of satellite images, the distribution of TOMS aerosol index, and the analyses of streamlines and backward trajectories.

• 한국해안·해양공학회논문집
• /
• 제26권1호
• /
• pp.41-48
• /
• 2014

태풍 볼라벤의 폭풍해일을 분석하기 위해 단순한 해석적 모형들을 사용하여 서해안 발생한 폭풍해일의 주요 원인을 조사하였다. 여기서 사용된 단순한 해석적 모형은 볼라벤의 실제 현상을 정확하게 재현할 수는 없으나, 폭풍해일에 내재된 주요 물리현상의 설명에는 충분하였다. 수심이 상대적으로 깊은 섬에 발생한 폭풍해일은 태풍에 동반된 바람보다는 저기압에 의한 해면상승이 주도적으로 작용하였다. 천해인 연안지역에서는 저조시에 1 m 이상의 해일고가 관측되었고 이는 주로 바람에 의해 발생된 것이다.

• 한국관개배수논문집
• /
• 제19권1호
• /
• pp.50-63
• /
• 2012

Many reclaimed tideland projects in Korea have been conducted to secure the food self-sufficiency. In fact, the domestic food self-sufficiency has been greatly improved and reclaimed tideland projects contribute to Korea's economic and social development directly or indirectly replacing agricultural lands from urbanization, industrialization. As result, current self-sufficiency of rice reach the demand(104.6%) while rate of upland crops has less than 30% of self-sufficiency rate and corn, wheat, soybeans, etc. are virtually dependent on imports. Domestic price of crop is expected to be unstable by trend of international grain prices. Therefore, developing reclaimed tidelands as upland which is originally constructed for paddy fields could be a good option to become steady in domestic crop market and dedicate to ensure a stable food security. The study to prepare measures for dealing with disasters in reclaimed tidelands of west coast district is required in order to utilize those sites for infra construction of multi-utilization in those sites and The result of flooding analysis in this study can suggest policy direction for practical utilization of reclaimed tidelands in yellow sea area.

• 한국측량학회:학술대회논문집
• /
• 한국측량학회 2004년도 추계학술발표회 논문집
• /
• pp.275-279
• /
• 2004

This study was done to detect the topographic and terrain change of the vicinity of the west coast. To make the basic map of the change in topology and terrain, the mosaic images were made using the images from the satellite, which were given the geometric correction based on the GCP (Ground Control Point) and DEM (Digital Elenation Model) data. The accuracy of the images was examined by .empaling them with CCP through 1:25,000's digital map. After that, among the resultant images of the 1970s and 2000s, those of Sihwa, Hwaong and Ansan, the lands reclaimed by drainage were compared to observe the change in the area. From this study, the accuracy of the images of the west coast from satellite could be acquired and the change of the topology and terrain was detected effectively. From the results, it was known that, in case of the land the topological change was not so big due to the development in the reclaimed land or the bare land. In Sihwa, the size of the land was increased 180 $\textrm{km}^2$ and that of the seashore was decreased 110 km. in Hwaong the size was increased 50 $\textrm{km}^2$ and in Ansan the city space was increased 71 $\textrm{km}^2$ due to the formation of the industrial complex.

• Animal Systematics, Evolution and Diversity
• /
• 제28권1호
• /
• pp.12-19
• /
• 2012

A cyclopoid species from several salt marshes and estuaries on the west coast of South Korea were identified as Halicyclops continentalis Ueda and Nagai, 2009, recently described from Ariake Bay at northwestern Kyushu, Japan. Detailed examination on the Korean specimens justifies Ueda and Nagai's proposition that the H. sinensis sensu Tai and Chen, 1979 formerly known from the Chinese coast of the Yellow Sea should be identical to H. continentalis. Furthermore, this report reinforces their assumption on the geographical distribution of H. continentalis, that is, the Ariake Bay population is a continental relict of the East Asia continent. Herein, a redescription of the species is provided on the basis of the Korean specimens, with a comment on the morphological comparison among three populations around the Yellow Sea.