• Explosives and Blasting
• /
• v.33 no.2
• /
• pp.40-43
• /
• 2015

In this case study, a S/W optimized for ground vibration monitoring and analysis was developed. It was applied at vibrating compaction works for the ground improvement needed for the expansion of terminal 5 in Chagi International Airport in Singapore. The possible application of the new vibration analysis software to similar works like pile driving and the capability of long term and real time of the repeated wave vibration at seawalls, the vibration occurring from large structures like super tall buildings, tunnels, long cable hanging bridges, and etc were investigated.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2018.11a
• /
• pp.52-54
• /
• 2018

울산신항 북방파제(제3공구)축조공사에서는 국내 최초로 선박제조용 F/D(Floating Dock)선을 적용하여 케이슨 제작 및 거치공사를 실시하였으며, 공장형 슬립폼 제작장(IP-CCV)를 적용한 경우 보다 공기단축 및 원가절감의 효과가 있었다. F/D선 공법 순서는 작업부두에 F/D선 접안, 케이슨 제작, F/D선 진수장 이동, F/D선 및 케이슨 진수, 케이슨 예인 및 거치의 순서로 시행되었으며, 현재 턴키공사의 설계특화 내용으로 활용되어 시공안정성 향상 및 공기, 공사비 절감 방안으로 적용되고 있다. 향후 남북관계가 원만히 해결되어 동해안 항만개발이 가속화되면 국외특허공법(IP-CCV)에 의존없이 경쟁력있는 공법이라 판단된다.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
• /
• 2002.10a
• /
• pp.94-99
• /
• 2002

최근 들어 해양개발에 관심이 고조되면서 심해저의 진출이 늘어날 것으로 보이며 또한 환경에 미치는 영향 등으로 부유식 소파제의 이용이 늘어날 것으로 생각된다. 이러한 부유식 소파제는 고정식 방파제의 문제점을 상당히 해소할 수 있는 반면 아직까지 완전히 이해되고 해결되지 못한 부정적인 면도 가지고 있다. 이에 본 연구는 부유식 소파제의 설계시 이용 가능한 정보를 얻고자 부유식 소파제의 형상과 파수에 따른 투과율에 대해 원형과 사각형 그리고 catamaran을 비교하였으며 사각형에 있어서는 계류삭의 위치에 따른 차이점을 비교하였다. 또한 catamaran 부소 파제의 후면에 catamaran 구조물이 있는 경우 즉, Dual catamaran의 운동에 대해서도 고찰하였다.

• Journal of Korean Port Research
• /
• v.12 no.2
• /
• pp.313-322
• /
• 1998

The distributions of chemical oxygen demand (COD) and suspended solid (SS) in Ulsan Bay were simulated and reproduced by a numerical ecosystem model for the practical application to the management of marine water quality and the prediction of water quality change due to coastal developments or the constructions of breakwater and marine facilities. Comparing the computed with the observed data of COD and SS in Ulsan bay the results of simulation were found to be good enough to satisfy the practical applications.

• Water for future
• /
• v.47 no.2
• /
• pp.87-97
• /
• 2014

해안의 침식저감은 해안보전 정책 중에서 가장 중요한 목표가 되고 있다. 하지만, 침식을 야기하는 요인의 다양성과 결과예측의 어려움 등으로 인하여 기존공법의 유효성에 많은 의문이 있다. 이러한 대응효과의 불확실성을 극복하는 하나의 방법으로서 해안모래의 사정에 따라 그때그때 조치하는 유연한 대응을 생각할 수 있는데 이러한 관리형 대응을 실현하기 위해서는 만족할 만한 핵심요소 기술이 필요하다. 최근 들어 구조형식이 간단하면서 경제적인 투과성 철재형 이안제가 개발되었다. 본 해안침식저감용 기술은 파랑제어가 수평판으로 가능하고 착탈식이며 이동이 간단하다. 이러한 특징을 활용하면 해안의 사정에 따라 관리할 수 있는 전략적 해안보전이 가능해 질 수 있다. 특히 본 구조물은 평균해수면 상승에 대해서도 추가비용이 거의 발생하지 않으므로 범용적 활용을 기대할 수 있어서 빠른 기술축척을 기대할 수 있다. 본 연구는 전략적 해안 보전 정책을 수행하기 위한 핵심요소기술의 적용성에 대하여 고찰하였다. 연구결과, 해안의 침 퇴적 사정에 따라 그때그때 파에너지의 투과율을 가변화시킴으로서 해안보호를 경제적으로 할 수 있음을 확인하였다.

• Journal of Korean Port Research
• /
• v.8 no.2
• /
• pp.57-65
• /
• 1994

A theoretical formulation is performed to investigate the wave reflection and transmission ratios by a submerged multi-layered rubble-mound breakwater. This theory, which is based on the linear boundary integral method, can be extended to the multi-layered breakwater with arbitrary cross section. In the theoretical analysis evanescent mode wave is not considered, since fictitious open boundaries are put on the places far from the structure. Therefore the mathematical presentation may be simpler, and computational time shorter. The validity of obtained numerical results is demonstrated by comparing with ones of impermeable and permeable breakwaters. Comparison shows resonable agreement. On the basis of these verifications this theory is applied to the one and two-layered submerged rubble-mound breakwater with trapezoidal type.

• Journal of the Korean Society for Marine Environment & Energy
• /
• v.9 no.3
• /
• pp.141-147
• /
• 2006

A newly designed floating breakwater made of Polyethylene with considering the introduction of new material for being harmony with environment and stability of the floater is developed for a marine ranching. In this study, the new concept in which incident wave dissipates its energy due to the vortex shedding by passing through the pipes and sheets is selected for wave breaking mechanism. Model experiment in order to te st its capability is performed for the regular and irregular waves in ocean engineering basin. Good capability to break the incident wave within the 6 seconds of period and 1 m of height is shown. Breaking efficiency for long period wave is not so good in regular and irregular wave. The results of this study will contribute to the design and construction of the floating breakwater.

• Journal of the Korean Association of Geographic Information Studies
• /
• v.10 no.2
• /
• pp.1-10
• /
• 2007

The tendency of erosion and accretion of the coast has occurred by the wanton development of a shore so that establishing the plans of nature preservation and development according to shoreline change is in demand. In this study, six DGPS positioning are executed in the periodic interval of about 2 months to choose coastal area of Gangnung, Gangwon-do and the observation data which is post-processed about 50cm accuracies on the Gangnung regular service is compared with digital map in 1998 and digital chart in 2006. Comparing DGPS values with shoreline of digital map, we know that erosion has occurred locally around training dike placed in Gangmun harbor and in southern Namhangjin, many accretions has happened near the breakwater of Namhangjin region and partial accretion is occurring in the other area. Therefore DGPS which is an acquisition method suitable for GIS data input is in use to collect the horizontal data and it could be used effectively to measure the shoreline change of time series through the long-term continuous observation by the coastal development.

• Journal of Ocean Engineering and Technology
• /
• v.33 no.6
• /
• pp.573-580
• /
• 2019

A submerged breakwater is a coastal structure built under water with excellent landscape. The depth of the crest of the breakwater should be maintained at more than a certain level in order for the submerged breakwater to control waves properly. This means that the effect of blocking waves deceases sharply at high tide in coastal areas with large tidal differences. In this study, we proposed a Tide-Adapting Submerged Breakwater (TA-SB) to overcome this problem, and then we conducted hydraulic model experiments to evaluate the performance of the TA-SB for controlling waves. The experimental results showed that the tapered wings attached to the crest of the TA-SB helped induce forced breaking waves. In particular, they were very effective in blocking waves and attenuating wave energy at high tide. In addition, the wave control performance of the proposed TA-SB was far superior to the Tide-Adapting Low-Crested Structure (TA-LCS) of the previous study.

• Journal of Korean Society of Coastal and Ocean Engineers
• /
• v.18 no.1
• /
• pp.1-14
• /
• 2006

This paper presents the techniques developed using the line source method to internally generate waves on an arc in a rectangular grid system. For five different types of wave generation layouts, quantitative experiments were conducted under the following conditions: the propagation of waves on a flat bottom, the refraction and shoaling of waves on a planar slope, and the diffraction of waves to a semi-infinite breakwater. Numerical experiments were conducted using the extended mild-slope equations of Suh et al. (1997). The fifth type of wave generation layout, consisting of two parallel lines connected to a semicircle, showed the best solutions, especially for a small grid size.