• Proceedings of the Korea Air Pollution Research Association Conference
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• 2006.04a
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• pp.91-92
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• 2006

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1689-1693
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• 2008

서해안은 최대 조석 차 9 m 이상의 세계적으로 손꼽히는 반일조 지역이므로 염수가 신곡수중 보까지 치고 올라오는 것으로 알려져 있으나 한강 하구부에서의 흐름 및 염도분포 해석에 관한 연구는 지형적 군사적 특성 상 많이 진행되지 못했다. 본 연구에서는 2차원 하천해석 프로그램인 RAMS를 적용하여 신곡수중보 하류로부터 유도지점까지의 염도 분포 및 염수 길이를 해석하고 경험식을 이용해 수치모의 결과를 검증하였다. 염수가 최상류까지 치고 올라갈 수 있는 조건으로 최대조위와 최소유량을 가지는 시점을 택해 염도분포 농도를 계산하였으며 하류단인 유도지점의 염도를 인천검조소 실측값으로부터 전이하기 위해 이송분산방정식의 연속주입 해석해를 이용하였다. 염도분포의 최선단부는 장항 IC 부근으로 최대 역류 발생 위치와 같은 지점이었으며 정상염수 쐐기 경험식에 의해 염수의 길이를 해석한 결과와도 일치하였다.

• The Korean Journal of Quaternary Research
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• v.9 no.1
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• pp.19-32
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• 1995

한반도 서해 만경강-동진강 하구역 조간대 퇴적층의 수직층서 퇴적상 변화를 분석 하여 퇴적과정을 기초해양환경의 관점에서 해석하였다. 본 연구해역 저 조선의 퇴적층은 사 질함량이 우세한 반면 방조제와 인접한 만조선의 퇴적층은 실트질이 우세하였고 상층과 하 층의 퇴적물이 뚜렷하게 구분되었다. 사질퇴적층의 내부퇴적구조는 괴상구조, 평행층리 및 사층리 구조등이 우세하며 니질퇴적층에서는 모래/니질 교호엽리구조가 우세하다. 본 연구 의 결과 만경강-동진강 조간대 퇴적층서는 인근의 방조제 축조에 다른 퇴적환경 변화에 크 게 영향받은 것으로 해석된다, 즉 방조제축소 이전 고에너지의 퇴적환경에서 집적되었던 사 질퇴적층이 방조제축조 이후에는 저에너지 환경조건에서 집적된 니질퇴적물로 피복된 것으 로 해석된다.

• Journal of Korean Society of Forest Science
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• v.18 no.1
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• pp.23-33
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• 1973

The survivals of loblolly pine, Pinus taeda L. was gradually increased from southeast to northwest in the species range and the provenances from southeast of the species range showed fast growth rate. It is suggested that the loblolly pine from Arkansas and Texas will be good for inland of Korea, and the trees from Maryland and North Carolina Piedmont will be suitable for the west coastal and east coastal region of Korea, and trees from North Carolina Coastal Plain will be promising one for south coastal region of Korea.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.412-412
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• 2018

최근 지구온난화의 영향으로 겨울철 한파를 야기하는 일이 잦아지고 있다. 우리나라에도 그 영향으로 매년 겨울 한파가 지속되고 있다. 그러므로 겨울철 적설량을 기록하고 갑작스러운 재난에 대비하는 것은 지구온난화의 또 다른 숙제가 되었다. 우리나라는 전통적으로 폭설 피해가 크지 않았기 때문에 적설관측소의 수가 강우관측소에 비해 현저히 적다. 그리하여 추가적인 적설관측소의 설치가 필요하다고 판단되지만, 이에 앞서 우리나라의 현재 적설관측소의 분포현황을 분석하였다. 1월, 2월, 12월의 최대 최심신적설량과 관측소 고도자료를 K-평균 알고리즘의 4개의 변수로 사용하였으며, 전국에서 총 94개의 적설관측소를 자료보유기간으로 분류하여 군집분석을 수행하였다. 군집분석 결과 서해안지역, 태백 소백산맥을 따라 존재하는 내륙산악지역, 경상도와 남해안 그리고 제주도지역, 울릉도와 대관령으로 군집이 형성되었다. 또한, 제주도의 적설관측소가 해안가 위주로 설치되어있어, 비교적 눈이 많이 오는 한라산 산간지역에 추가적인 적설관측소 설치가 고려되어야 할 것이다.

• Monthly Duck's Village
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• s.248
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• pp.8-13
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• 2024

안성시는 경기도 최남단에 위치하고 있으며 서쪽으로는 평택, 북동쪽으로는 이천시, 남쪽으로는 천안·진천·음성, 북쪽으로는 용인시와 경계를 이루고 있다. 동쪽으로는 청미천이 흐르고 있고 서쪽으로는 안성천과 조령천, 한천이 합류해 서해로 흘러나간다. 한우, 돼지 등 가축마릿수가 많아 도농복합도시의 대표주자로 꼽히고 있다. 특히 경기도에서는 오리 마릿수가 가장 많은 도시 중 하나로 안성시가 꼽히고 있으며, 타 가금류도 많은 편이다. 지난 1월 8일 안성시 25만7,000마리의 산란계 농장에서 고병원성 AI가 발생했다. 발생농장 10km반경내 59개 농장, 428만 마리의 가축이 있어 방역당국의 긴장감은 최고조에 달했지만 안성시와 중앙방역 당국의 발빠른 초동대처로 AI가 전파되지 않으면서 이목이 집중되고 있다. 방역과 산업발전이라는 '두마리 토끼'를 잡고 있는 안성시를 직접 찾아가봤다.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.24 no.4
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• pp.495-508
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• 2019

Tidal datums are key and basic information used in fields of navigation, coastal structures' design, maritime boundary delimitation and inundation warning. In Korea, the Approximate Lowest Low Water (ALLW) and the Approximate Highest High Water (AHHW) have been used as levels of tidal datums for depth, coastline and vertical clearances in hydrography and coastal engineering fields. However, recently the major maritime countries including USA, Australia and UK have adopted the Lowest Astronomical Tide (LAT) and the Highest Astronomical Tide (HAT) as the tidal datums. In this study, 1-hr interval 19-year sea level records (1999-2017) observed at 9 tidal observation stations along the west and south coasts of Korea were used to calculate LAT and HAT for each station using 1-minute interval 19-year tidal prediction data yielded through three tidal harmonic methods: 19 year vector average of tidal harmonic constants (Vector Average Method, VA), tidal harmonic analysis on 19 years of continuous data (19-year Method, 19Y) and tidal harmonic analysis on one year of data (1-year Method, 1Y). The calculated LAT and HAT values were quantitatively compared with the ALLW and AHHW values, respectively. The main causes of the difference between them were explored. In this study, we used the UTide, which is capable of conducting 19-year record tidal harmonic analysis and 19 year tidal prediction. Application of the three harmonic methods showed that there were relatively small differences (mostly less than ±1 cm) of the values of LAT and HAT calculated from the VA and 19Y methods, revealing that each method can be mutually and effectively used. In contrast, the standard deviations between LATs and HATs calculated from the 1Y and 19Y methods were 3~7 cm. The LAT (HAT) differences between the 1Y and 19Y methods range from -16.4 to 10.7 cm (-8.2 to 14.3 cm), which are relatively large compared to the LAT and HAT differences between the VA and 19Y methods. The LAT (HAT) values are, on average, 33.6 (46.2) cm lower (higher) than those of ALLW (AHHW) along the west and south coast of Korea. It was found that the S_a and N₂ tides significantly contribute to these differences. In the shallow water constituents dominated area, the M₄ and MS₄ tides also remarkably contribute to them. Differences between the LAT and the ALLW are larger than those between the HAT and the AHHW. The asymmetry occurs because the LAT and HAT are calculated from the amplitudes and phase-lags of 67 harmonic constituents whereas the ALLW and AHHW are based only on the amplitudes of the 4 major harmonic constituents.

• Journal of the Korean Society of Marine Environment & Safety
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• v.19 no.5
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• pp.467-475
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• 2013

In order to seize quantitative materials as part of studies on measures for oil pollution prevention and control, the statistics of oil pollution incidents in Korean coastal waters for 10 years from 2003 to 2012 were analyzed with relation to the number of oil spills and the volume of oil spilt according to causes, sources and sea areas of spills. Total number and total volume of oil spills for 10 years were found to be 2,833 cases and 17,877 kL, respectively. 50.4 %(1,429 cases) of total number of oil spills were caused by negligence, although oil spillage due to negligence was 294 kL(1.7 %). While oil spillage caused by marine accidents was 17,400 kL(97.3 %), marine accidents accounted for 27.9 %(790 cases) of total number of oil spills. While negligence had a great influence on the number of oil spills, marine accidents had a huge impact on the amount of oil spilt. Fishing boats accounted for 42.7 %(1,210 cases) of the number of oil spills, and although oil tankers accounted for 9.2 %(261 cases) of the number of oil spills, oil spillage from oil tankers was 15,488kL(86.7 %). It means that oil tankers such as VLCC or ULCC may be the main sources of major oil spills and a few very large spills are responsible for a high percentage of the amount of oil spilt. While the number of oil spill incidents was closely related to the accidents of fishing boats, the volume of oil spilt was greatly affected by the major oil spill incidents of oil tankers such as M/T Hebei Spirit. The number and volume of oil spills were shown to be 1,613 cases(56.9 %) and 3,804 kL(21.3 %) in South Sea, 700 cases(24.7 %) and 13,501 kL(75.5 %) in West Sea, and 520 cases(18.2 %) and 572 kL(3.2 %) in East Sea of Korea, respectively. The highest number of oil spills was found in South Sea and the most volume of oil spilt was shown in West Sea of Korea for 10 years.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.18 no.3
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• pp.131-141
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• 2013

Stock identification of Todarodes pacificus collected in the East Sea, Yellow Sea and East China Sea during the period from September to December in 2011 was analyzed by morphometric characters and mitochondrial DNA (mtDNA) cytochrome oxidase subunit I (COI) gene nucleotide variations. Frequency distributions of mantle length was analyzed by morphological method with measuring size of T. pacificus. Then each stock was estimated to confirm their maturation for mean mantle length comparing with mean mature mantle length 20-22 cm. According to morphologic stock identification, it is estimated that the northern part of East Sea is categorized as summer stock and the rest parts, including mid /southern part of the East Sea, northern part of the East China Sea and northern part of the West Sea were autumn stock. For genetic analysis, a total 49 haplotypes were defined by 33 variable nucleotide sites. From the extensive haplotype diversity, limited nucleotide diversity and star-like shape of haplotype network, T. pacificus appears to have undergone rapid population expansion from an ancestral population with a small effective population size. Although pair-wise Fst estimates which represent genetic difference among groups were low, there are relatively remarkable difference of Fst between middle and southern part of the East Sea. Although middle part of the East Sea and southern part of the East Sea were situated at the East Sea, genetically separated groups were appeared.

• 한국지구물리탐사학회:학술대회논문집
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• 2008.10a
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• pp.85-92
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• 2008

National Oceanographic Research Institute is carrying out an oceanographic survey for the entire sea areas around Korean Peninsula annually starting with the East Sea from 1996 by establishing a national oceanographic basic map survey plan for the sea areas under the jurisdiction of Korea, so this paper used the oceanographic geomagnetism data measured at the southern area of the Yellow Sea using 'Hae Yang 2000' in 1999, aiming at clarifying the cause of geomagnetic abnormality zone during the course of treating and analyzing the geomagnetic data. For treatment of magnetic data, we obtained electromagnetic force values and geomagnetic abnormality values around the investigated sea area through a process of searching and removal of bad data, correction of sensor positions, correction of magnetic field effects around the hull, correction of diurnal variation, normal correction, correction of cross point errors, etc. The electromagnetic force distribution around the investigated sea area was $49000\;{\sim}\;51600\;nT$, which is judged to be within the normal electromagnetic force intensity distribution range around the Yellow Sea. The isodynamic lines are distributed in Northeast-Southwest direction, and electromagnetic force values are increasing toward the northwest. The result of comparing the magnetic abnormality around the sea area among $124^{\circ}$ 49' 48" E, $35^{\circ}$ 10' 48" N $\sim$ $125^{\circ}$ 7' 48" E, and $35^{\circ}$ 33' 00" N sections with the elastic wave cross section and the result of modeling coincide well with the underground geological structure clarified from the existing elastic wave survey cross section. Therefore, it is judged that the distribution of magnetic force abnormality generally shows the effect pursuant to the distribution of the sedimentary basins in the Tertiary period and the bedrocks in the Cretaceous period which are well developed in the bottom of the sea.