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Impact Analysis on the Coastal Erosion and Accretion due to Relocation of the Breakwaters
이승철(S.C. Lee),이중우(J.W. LEE),김강민(K.M. KIM),김기담(K.D. KIM) 한국해양환경·에너지학회 2007 한국해양환경공학회 학술대회논문집 Vol.2007 No.-
최근 들어 지구온난화의 영향으로 평균 해수면이 빠르게 상승하고 있으며, 폭풍의 규모도 더불어 증가 하고 있다. 해수면의 상승은 다양한 범위에 걸쳐서 환경적인 문제를 일으키고 있다. 특히, 조위 그리고 조류 속의 증가를 유발시키고, 기본 파랑을 증가시킨다. 그래서 해안 주변지역에서 받는 에너지는 증가된다. 이러한 영향은 구조물, 침식 그리고 퇴적에 영향을 주며, 연안 환경에 불균형을 가져온다. 연안과정의 문제도 유사하며, 폭풍기간동안 한국의 삼천포시 인근의 작은 대방항 등의 정박지와 외곽시설물에 피해를 입힌다. 항내 선석의 정온도를 확보하기 위해서 외곽시설을 재배치시킨 결과를 분석하였다. 대상지역의 항만들은 대방수로에 인접해 있기 때문에 구조물을 재배치시키면 유속, 유향 그리고 파고에 반드시 영향을 미치게 되어 해저면의 변형이 생긴다. 따라서 우리는 당 해역의 정박지와 방파제의 모델을 만들어 테스트를 하였다. 해안과정과 수로 부근의 유사이송 체계의 신뢰성 있는 모델 연구를 위해서는 현장이력과, 파랑기록, 조석, 바닥물질 등의 비교가 필요하다. In recent years, the rate of mean sea level rise is increasing rapidly from the phenomena of global warming, together with the increasing trend of the storm scale. The issue of sea level rise is multifaceted and produces a range of environmental problems. Especially, high tides and the tidal currents become higher, and wave base increases, so the energy received at the coastal boundary may increase. This brings that many coastal environments go into disequilibrium, such as damages to the structures, erosion, and deposition. Similarly it was known that the problems of nearshore processes and damage of berth and counter facilities during storm period had appeared at the small fishery port, Daebang near Samcheonpo city, Korea. Here we try to analyze the impact of the rearrangement of counter facilities and berth layout adopted for tranquility of its’inner harbor. Because this harbor is being connected to Daebang channel, the rearrangement of the structures might affect to the current speed and direction and wave height, so do to the sea bottom undulation. Therefore, we made model test for the several layouts of the berth and breakwater in this area. Although the m여el study gave reasonable description of beach processes and approach channel sedimentation mechanism, it is necessary to compare with the field history, including the records of waves, tides and bottom materials, etc. for better prediction.
박병곤,장정균,성현철,장비호,김강민,한인우,Park, B.G.,Jang, J.G.,Seong, H.C.,Jang, B.H.,Kim, K.M.,Han, I. 한국천문학회 2003 天文學論叢 Vol.18 No.1
A CCD camera for the BOES (Bohyunsan Observatory Echelle Spectrograph) has been developed. The camera consists of a 2048 ${\times}$ 4096 format CCD, a SDSU Gen-I CCD controller, and a continuous flow cryostat (CFC) designed by the ESO. In order to control the CCD under SDSU Gen-I controller, the voltage level of all the biases and clocks were lowered by -6V. The CFC showed cooling time of about 10 hour, after which the chip temperature settled down with variation less than ${\pm}1^{\circ}C$. The final chip temperature is around -105$^{\circ}C$ with the setting value for the CFC as -170$^{\circ}C$.
박병곤,성현철,장정균,장비호,이병철,박윤호,김강민,한인우,Park, B.G.,Seong, H.C.,Jang, J.G.,Jang, B.H.,Lee, B.C.,Park, Y.H.,Kim, K.M.,Han, I. 한국천문학회 2003 天文學論叢 Vol.18 No.1
The characteristics of the BOES (Bohyunsan Observatory Echelle Spectrograph) CCD camera is presented. In order to get optimum gain and readout noise of the CCD, we examine the variation of the gain and readout noise by changing the value of output drain voltage of the CCD and measuring the gain using transfer curve, which is defined as the plot of variance versus mean exposure level of a homogeneous light onto the CCD surface. The gain and readout noises are optimised to be 0.5e$^-$/ADU and 3e$^-$, which is good for highest signal-to-noise ratio and contrast for the low light level characteristics of the BOES. We also measure the dark count of the CCD by getting five dark images with 3600 seconds exposure time. The mean dark count from median stacked dark images is essentially zero. A table of positions of defected pixels is also presented.