2018년 항만투자 계획

한국연안방재학회 한국연안방재학회 2018 한국연안방재학회지 Vol.5 No.1

동해안 연안침식 원인과 대응기술 개발

심재설(Shm, Jae-Seol),임학수(Lim, Hak-Soo) 한국연안방재학회 2016 한국연안방재학회 학술발표대회 논문집 Vol.2016 No.-

동해안에서 점차 심각하게 야기되고 있는 연안침식을 방지하기 위해서는 우선 연안침식의 원인과 토사이동의 메커니즘을 규명하고, 더 이상의 연안침식을 방지하기 위한 효과적인 연안정비사업을 수행해야 한다. 이를 위해 국가나 지자체의 지원으로 장기적인 연안침식 모니터링 사업이 지속되어야 하며, 연안침식 대응기술 개발과 같은 국가 R&D를 수행하여 연안정비사업의 효율성을 높여야한다. 또한, 동해안에 표사계를 설정하고 표사계 내 모래의 유입과 유출을 검토하여 연안 표사수지(Sand Budget) 체계를 작성해야 연안개발이나 인공구조물 설계시 또는 시공 후 발생 가능한 연안침식을 저감할 수 있는 방안을 마련할 수 있다. 미래 기후변화에 의한 너울성 고파랑 증가와 연안개발 또는 인공구조물 건설로 야기되는 연안침식으로부터 연안역을 보호하기 위해서는 연안통합관리 방안을 시급히 마련하여 관계기관의 공동정책이나 협동 관리체계를 서둘러서 수립해야 한다.

인공자갈의 연안침식 저감 능력 수리실험

김효섭(Kim, Hyoseob),이승호(Lee, Seungho) 한국연안방재학회 2016 한국연안방재학회 학술발표대회 논문집 Vol.2016 No.-

본 논문에서는 인공자갈이 가지고 있는 연안침식 저감 능력을 알아보는 수리실험을 진행하였다. 모래 해변의 경우, 외력에 의한 침식이 발생하여 모래가 외해로 빠져나가는 반면 인공자갈이 배치된 해변은 연안 인근 외력에 의한 침식을 줄이고 해안선을 보존 혹은 전진 시키며 기존보다 큰 연안경사를 유지시키는 것을 확인하였다. 인공자갈의 주원료가 되는 시멘트의 안정성 또한 인체와 환경에 유해하지 않은 것으로 조사되고 있어 인공자갈을 이용한 연안보호 공법은 연안침식 대응 공법으로써 큰 효과를 가질 것으로 판단된다.

제2차 연안정비기본 계획의 변경 과정을 통한 향후 과제

윤성순(Yoon, Sungsoon) 한국연안방재학회 2014 한국연안방재학회 학술발표대회 논문집 Vol.2014 No.-

연안관리법에 제23조에 따라 2009년에 수립, 고시된 제2차 연안정비기본계획의 추진과정과 그 동안의 연안의 다양한 여건 변화 등을 검토하여 변경계획을 수립하였다. 동기간동안의 연안정비사업은 연안의 보전과 친수기능 제공이라는 사업목적에 부합하는 긍정적 효과를 발휘하였지만 보다 발전된 연안정비사업의 추진체계를 위해서는 개선해야할 과제들이 도출되었다. 연안을 보다 안전하고 쾌적하게 유지하고 관리하기 위한 효과적수단으로서의 연안정비사업 의 안정적인 추진을 위해 앞으로 해결해야할 과제와 방향성을 제시함으로써 지속적인 제도의 개선과 정책의 효과를 제고하고자 하였다.

사동항 2단계 동방파제의 해양환경을 고려한 시설계획

안성욱,심상효,손건목 한국연안방재학회 2014 한국연안방재학회지 Vol.1 No.2

소청초 종합해양과학기지 Radar 파랑 관측 데이터의 신뢰도 향상

민용침(Yong chim Min),정진용(Jin Yong Jeong),심재설(Jae Seol Shim),도기덕(Ki deok Do) 한국연안방재학회 2017 한국연안방재학회지 Vol.4 No.4

Ocean Research Stations (ORSs) is the ocean platform type observation towers and measured oceanic, atmospheric and environmental data. These station located on the offshore area far from the coast, so they can produce the data without land effect. This study focused to improve the wave data quality of ORS station. The wave observations at ORSs are used by the C-band (5.8 GHz, 5.17 cm) MIROS Wave and Current Radar (MWR). MWR is convenient to maintenance and produce reliability wave data under bad weather conditions. MWR measured significant wave height, peak wave period, peak wave direction and 2D wave spectrum, so it’s can provide wave information for researchers and engineers. In order to improve the reliability of MWR wave data, Datawell Waverider Buoy was installed near the one ORS (Socheoncho station) during 7 months and validate the wave data of MWR. This study found that the wave radar tend to be overestimate the low wave height under wind condition. Firstly, this study carried out the wave Quality Control (QC) using wind data, however the quality of wave data was limited. So, this study applied the four filters (Correlation Check, Direction Filter, Reduce White Noise and Phillips Check) of MWR operating software and find that the filters effectively improve the wave data quality. After applying 3 effective filters in combination, the RMSE of significant wave height decreased from 0.81m to 0.23m, by 0.58m and Correlation increased from 0.66 to 0.96, by 0.32, so the reliability of MWR significant wave height was significantly improved.

연안정비사업 선정의 타당성 평가체계와 개선방향

장정인(Jeong In Chang),윤성순(Sung soon Yoon) 한국연안방재학회 2017 한국연안방재학회지 Vol.4 No.4

In this study, we dealt with the process of establishing more objective and scientific evaluation system to select coastal maintenance projects. The maintenance project evaluation system consists of an indicator evaluation, an on-site evaluation, and an expert evaluation. In order to maximize the merits of the individual evaluation stage and to supplement the limitations, a three-step evaluation system was adopted. In order to integrate the evaluation scores for each evaluation stage, the multi - attribute utility theory, which is one of the multi-criteria decision methodologies, was applied to derive the evaluation weights. In addition, this study examined the public interest and the need for policy through the survey of public awareness. In the case of policy makers, experts judged that business is important in terms of urgency, fitness for particular purpose, and appropriateness of project contents. However, citizens who are beneficiaries of the project judged that the appropriateness of project contents is most important. In addition, we reviewed the recent progress of the post - management system after the coastal maintenance project and discussed the issues to be considered when establishing the coastal maintenance plan. In the long term, it is necessary to link up post - management system with evaluation systems when establishing the next maintenance project.

XBeach 모델을 사용한 후정해변 폭풍파 연안침식 영향 수치모형 실험

장연식(Yeon S. Chang),진재율(Jae Youll Jin),정원무(Won Mu Jeong),도종대(Jong Dae Do) 한국연안방재학회 2017 한국연안방재학회지 Vol.4 No.4

The east coast of Korea occasionally suffers from the extreme storms developed by the winter time extratropical cyclones in the East/Japan Sea. The damages from these storms are not only due to strong winds but also due to high waves that cause severe coastal erosions. In October, 2006, storm waves were observed higher than 6 meters, the highest record in the past 15 years. In this study, we performed a numerical experiment to predict possible erosion rates by simulating the 2006 storm condition in Hujeong Beach as this area is listed as one of the sites that have highest waves among the beaches along the east coast of Korea. For this we employed XBeach nearshore process model because it is specifically designed for the computation of coastal response during time-varying storm conditions. For XBeach modeling conditions, we also used SWAN model to calculate wave parameters based on the observations during the 2006 storm event. The grid spacing is set as fine as 5 m to resolve the minute changes in the nearshore region where seabed topography is complex due to sand bars. We ran XBeach for 48 hours during which the wave height at Hujeong Beach increased from ~1 to ~7m in the first 20 hours. The results show that the shoreline is retreated ~10m on average during the storm period. However, the erosion becomes more severe with maximum retreat of ~30m at the mouth of a stream where the original beach elevation was relatively lower. The eroded sediments are then cumulated outside the swash zone, which shows that the sand is conserved in the shallow region between the coastline and the sand bars. However, some of the crests of the sand bars are lost to offshore, indicating that total sand in the whole nearshore region may not be conserved under this high wave conditions.

월류식 인공리프 주위의 수면변동 수치해석

신영섭(Young-Seop Shin),홍창배(Chang-Bae Hong),이성대(Seong-Dae Lee) 한국연안방재학회 2018 한국연안방재학회지 Vol.5 No.1

In this study, we developed the program where the flows around the artificial reef of overflow type can be analyzed numerically. The unstructured grid system is used to cover the various geometries and the level set method is applied to treat the movement of the free surface. To obtain more accurate values of level, the informations of the cell connection in the domain are used to deliver the physical quantities of the free surface to neighbor cells. To verify numerical schemes, the flows in the wave tank of the piston type are simulated and compared with the analytic solutions and our numerical schemes are shown to be valid. The flows around the artificial reef are simulated as varying period and the effectiveness in the aspect of the wave breaking and the construction costs are confirmed.

만경강 기수역 하상 세립 퇴적물의 침강속도 산정

박지연(Ji Youn Park),류홍렬(Hong Ryul Ryu),박을재(Eul Jae Park),황규남(Kyu-Nam Hwang) 한국연안방재학회 2018 한국연안방재학회지 Vol.5 No.1

The purpose of this study is to quantitatively estimate the settling velocities of fine sediments in the Mankyung brackish water zone and to analyze their spatial changes by comparing with those of sediments from other regions. This study also includes the measurements of salinity of water and physico-chemical properties of sediments, such as grain size distribution, the percentage of organic contents, mineralogical composition, in order to examine their effects on spatial variation of setting velocities. Results from setting tests show that the setting velocities of Mankyung sediments varies in the range of two orders of magnitude (0.017 〈 Ws 〈 0.506 mm/s) over the corresponding concentration range of 0.1 to 80 g/L. The settling velocity profile measured for Mankyung sediments is shown typically to have similar features with those for marine (Saemangeum lake, Incheon coast) sediments, while it is quite different with those for river (Han river, Kulpo stream) sediments. These results are interpreted to be due to the presence of salinity in the brackish water zone, rather than physico-chemical properties of sediments.