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해도분석을 통한 낙동강 하구 사주 면적의 시ㆍ공간 변화
유창일(CHANG-ILL YOO),윤한삼(HAN-SAM YOON),류청로(CHEONG-RO RYU),이인철(IN-CHEOL LEE) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.6
This study discusses characteristic of spatiotemporal changes of the sand barrier in the Nakdong estuarine for the last century, focusing on geomorphologic evolution and mobility of sand barriers in the view of coastal engineering. The Nakdong estuarine, the research subject, has a complexly changing natural environment by interaction between ground and marine elements such as ocean wave, tidal current, sediment, etc. Moreover, recently, unnatural geomorphologic changes (e.g., seaside reclamation, new harbor construction, etc.) has been radically increased in this area with increasing desire for coastal development. Because of this, its sand barrier has developed quite unstable condition. Therefore, to identify the development process of geomorphologic changes in this area, required is a close examination on historical characteristics of spatiotemporal changes of the sand barrier in relation to surrounding seaside reclamation and physical environmental changes. This study, based on the marine charts published in between 1927 and 1995 year, analyzes the length and area of the sand barrier for the last hundred years, and investigates the cause of the changes by looking into the change of water depth for the last two years and doing ocean-physical site observations. In conclusion, the sand barrier of the Nakdong estuarine expands toward the open sea by 7.4~26 m in annual average, maintaining a fixed distance of 1,241~1.279 m, and its area is expected to increase about 2.8 k㎡ annually. This is characterized by the wocean wave from the open sea and the discharge of Nakdong River.
유창일,윤한삼,김규래,Yoo, Chang-Ill,Yoon, Han-Sam,Kim, Gyou-Tae 해양환경안전학회 2007 해양환경안전학회지 Vol.13 No.4
본 연구는 낙동장 하구역에 유입되거나 발생된 해안부유쓰레기의 거동특성을 파악하기 위해 2003년 태풍 "매미" 내습시 하구둑 최대 방류량을 조건으로 수치모형을 이용하여 해수유동장을 재현하고 제현된 유동장에 부유쓰레기로 대표되는 입자를 방출하여 입자들의 거동특성을 살펴보고자 하였다. 입자수치모의실험의 결과에 따르면 낙동강 하구역내 존재하는 부유쓰레기는 홍수유량시 72시간 경과시에 낙동강 하구역내 입자 분포 및 거동이 안정상태에 도달하였다. 공간상으로는 진우도를 포함한 가덕도 동측 해안의 경우 초기 33시간까지는 40%까지 증가하나 그 외 주변해역의 경우 $20{\sim}40%$ 범위를 유지하였다. This study reviewed the behavior(movement) characteristics of floating marine debris flowing in the Nakdong River Estuary using a simple numerical particle-tracking model on the conditions of the maximum water discharge outflow from the Nakdong River barrage during the passage of typhoon Maemi in 2003. The simulation showed that the particle distribution and movement of floating marine debris in the Nakdong River Estuary reached a stable state at 72 hours after the typhoon had passed, during the flood period of river discharge. The quantity of floating particles distributed on the east coast of Gadeok and Jinu Islands increased by 40% at 33 hours after starting the model, while the change in other sea areas was 20-40%.
수평축 조류발전건설시 공종별 특성과 산업잠수의 작업한계에 관한 연구
김원석,유창일(Chang-ill Yoo),류청로(Cheong-Ro Ryu) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
Marine energies are various and powerful, but it is so hard to work underwater construction. Therefore commercial diving work is very important to install various deep structures. Jangjuk channel is famous as proper area to generate tidal current energy. Nevertheless, no one is studied about characteristics of commercial diving works with construction of tidal current generation. The purpose of this study is to introduce commercial diving with work types and investigate ciritical limits of diving working under the conditions, which are working only 40 minutes at slack tide at slack tide during the neap tide. As the results, work types are five, mooring installation, OMAS (Offshore Maintenance Access System), support structure installation, cable and turbine installation, and are taken during the 18 months. At that time, entire diving working times are 110th. Entire construction period took 18 months and was over 4.5 times more than planned schedule (4 months). Extended construction period is due to insufficiency of researching tidal current conditions at the site and ignorance of slack tide which need to secure diving working time.
수평축 조류발전건설시 공종별 특성과 산업잠수의 작업한계에 관한 연구
김원석,유창일(Chang-ill Yoo),류청로(Cheong-Ro Ryu) 한국해양환경·에너지학회 2012 한국해양환경·에너지학회 학술대회논문집 Vol.2012 No.5
Marine energies are various and powerful, but it is so hard to work underwater construction. Therefore commercial diving work is very important to install various deep structures. Jangjuk channel is famous as proper area to generate tidal current energy. Nevertheless, no one is studied about characteristics cf commercial diving works with construction of tidal current generation. The purpose of this study is to introduce commercial diving with work types and investigate ciritical limits of diving working under the conditions, which are working only 40 minutes at slack tide at slack tide during the neap tide. As the results, work types are five, mooring installation, OMAS (Offshore Maintenance Access System), support structure installation, cable and turbine installation, and are taken during the 18 months. At that time, entire diving working times are 110th. Entire construction period took 18 months and was over 4.5 times more than planned schedule (4 months). Extended construction period is due to insufficiency of researching tidal current conditions at the site and ignorance of slack tide which need to secure diving working time.
부산-김해 강우조건이 낙동강 유역 하구둑 실방류량에 미치는 영향
윤한삼,윤창호,유창일,박정현,Yoon, Han-Sam,Yoon, Chang-Ho,Yoo, Chang-Ill,Park, Jung-Hyun 해양환경안전학회 2010 海洋環境安全學會誌 Vol.16 No.2
본 연구는 낙동강 하구역 하천 방류 특성을 해석함에 있어 보다 정도 높은 기상 자료를 선정할 목적으로 1996년부터 2008년까지(13년간) 얻어진 하구둑 실방류량의 특성을 분석하고 부산과 김해간의 기상자료(강우량 등)를 사용하여 그 차이를 계산하였다. Tank model을 사용하여 추산된 하천유량은 실제 하구둑 방류량과 비교하였고, 하구환경에 영향을 미치는 기상인자와 방류량간의 상관관계를 살펴보았다. 결과적으로 총 13년동안의 낙동강 하구둑으로부터 총방류량은 $272,653.3{\times}10^6\;m^3$/month으로 산출되었다. 방류량이 가장 많은 달은 7월이 $73,212.9{\times}10^6\;m^3$/month(26.9%)으로 가장 많고 8월이 22.0%, 9월이 18.9%의 순이었다. 최종적으로 낙동강 하구역의 유입하천유량을 산정함에 있어 부산 기상자료를 사용할 경우 실제 김해지역의 결과보다 하천유출량이 과대평가될 수 있음을 알 수 있었다. To obtain more accurate meteorological data for analyzing the river discharge characteristics at the Nakdong River Estuary, we investigated the characteristics of the release barrage discharge observed during the 13-year period from 1996 to 2008 and calculated the differences using meteorological data for the Busan and Gimhae weather stations. The river discharge estimated using a tank model was compared to the real river barrage discharge. We discussed the correlation between the discharge and the meteorological factors that affected the estuary water environment. This study found that total annual discharge from the Nakdong river basin for the 13 years was $272,653.3{\times}10^6\;m^3$/month. The largest monthly mean release discharge occurred in July at $73,212.9{\times}10^6\;m^3$/month (26.9% for the year), followed by August and September in that order with 22.0% and 18.9%, respectively.
수영만 해저지형의 공간적 변화를 고려한 파랑변형 수치모의
김희진(Hee-Jin Kim),유창일(Chang-Ill Yoo),류청로(Cheong-Ro Ryu) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
This paper is studied in variation of bottom topography using the charts(No. 202, 1:50,000; 1998, 2009) developed by National Marine Investigation Institute and the effect on wave transformation due to variation of bottom topography for 11 years in the vicinity of Suyeong bay. The results from this study are summarized as below. At less than 10m depth, deposition was observed more than 3m in right and left side of Suyeong river, Dongback island and south of Gwanganli beach. Wave height of S, E directions are predominant in east of Suyeong river estuary and south of Gwanganli beach. But, Wave height rates converged on to below 0.1 for all wave directions due to effect of deposition. In 1998s, wave height rates for all wave directions are converged in to 0.25~0.32 at west of Suyeong river estuary. However, wave height rates for all wave directions are converged in to 0.04~0.07 in 2009s. The results from numerical simulation, coastal deposition around near coast area produce in Suyeong Bay seems to be sufficiently affected on wave height reduction.
태풍내습시 수영만내에서의 파랑특성 분석을 위한 수치실험연구
김동환(Dong-Hwan Kim),유창일(Chang-Ill Yoo),이인철(In-Cheol Lee),김헌태(Heon-Tae Kim),류청로(Cheong-Ro Ryu) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
In order to research the wave characteristics in Suyeong bay on typhoons in 2011, this study were carried out observation of waves on typhoon "Ma-on" and "Muifa", calculation of wave characteristics using STWAVE and comparison with significant wave heights between observed and calculated data at three in-situ measurements (Geoje floating buoy, Gwangan light beacon, Observation point). The model input parameters are significant wave height, peak period and wave direction in Case 1 and changed edited wave direction instead of original it in Case 2 As the result of this study, the maximum significant wave height at Gwangan light beacon (St.1) and Observation point (St. 2) in case of "Ma-on" was observed, respectively, 2.8m, 2.6m and calculated by STWAVE 1.76m, 2.8m. Also, the maximum significant wave height in case of "Muifa" observed at St. 1 and St. 2 was 3.5m, 3.82m and calculated 2.5m, 3.97m, respectively. Our found significant differences between the observed and numerical in Gwangan light beacon on two typhoons but no significant differences between the observed and numerical in Observation point on two typhoons.