• 한국해안해양공학회지
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• 제19권1호
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• pp.73-80
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• 2007

동해안에 위치한 어항이나 항만은 주 외력으로서 파랑이 탁월한 특징을 갖고 있다. 아울러, 동해안에 존재하는 강한 해빈류는 어항구조물 주변의 표사이동에 매우 큰 영향을 미친다. 따라서 동해안에 어항이나 항만을 건설할 때에는 설계 시에 해빈류에 기인한 항만 주변의 표사이동 특성을 명확히 검토해야 할 필요가 있다. 본 연구에서는 연도별 해안선변화에 대한 측량자료 및 방파제 주변의 상세 수심측량자료를 이용하여 방파제 시공순서가 항내매몰 및 주변 표사이동에 미치는 영향에 대하여 구체적으로 파악하고자 하였다. 그리고 동해안에 건설되는 어항구조물의 항내에 발생하는 퇴사량 감소를 위한 보다 효율성 있는 시공순서에 대하여 검토하였다.

• 한국해안·해양공학회논문집
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• 제25권5호
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• pp.317-326
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• 2013

확률론적 설계법은 설계변수의 불확실성을 고려할 수 있기 때문에 직립방파제의 설계에 폭넓게 사용되고 있다. 대표적인 확률론적 설계법은 부분안전계수 설계법, 신뢰성 설계법, 성능설계법 등이 있다. 특히 성능설계법은 구조물의 수명 또는 설계폭풍 지속시간 동안의 누적활동량을 계산한다. 최근 설계폭풍 동안에 개별활동량의 최초통과확률을 산정할 수 있는 시간의존 성능설계법이 개발되었다. 하지만 개발된 방법의 허용기준이 없어 구조물의 안정성을 정량적으로 평가할 수 없었다. 본 연구에서는 다양한 수심과 극치파고분포의 특성을 반영한 구조물의 단면에 대하여 최초통과확률을 산정함으로써 두 가지 한계상태에 따른 허용최초통과확률을 제안하였다. 수리가능한계상태(개별 허용활동량 0.03 m)와 극한한계상태(개별 허용활동량 0.1 m)에서 허용최초통과확률은 각각 5%와 1%로 산정되었다. 제안된 허용기준을 적용하여 기후변화에 따른 파고 증가가 방파제 안정성에 미치는 영향을 평가하였다.

• 한국항해항만학회지
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• 제29권6호
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• pp.537-545
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• 2005

제주도는 전통적으로 전년 내내 온화한 해양기후조건을 가지고 있으며 청정한 자연환경과 극적인 해안경관으로 세계적인 휴양지로 유명하다. 그러나 우리나라 곳곳의 해안지역에서처럼 제주도 역시 해안구조물 건설 및 항만 재개발에 자연환경의 변화에 따른 예측하지 못한 해안침식 문제가 심각하게 대두되고 있다. 이들 지역에서는 섬의 남쪽 해안선에서 침식으로 인한 해안선의 급격한 변화를 보이는 것은 물론 해안선 절벽까지도 무너져 내리는 현상까지 나타나고 있다. 이미 선진국에서는 여러 해안공학자 및 연구자들이 해안침식에 대한 연구를 오랫동안 심도 있게 다루어 왔으나 우리나라에서는 아직 이 방면에 연구 활동이 미약하고 기초연구자료도 미흡하여 대책공법의 수립에 어려움이 존재하며, 무분별한 대책공법의 시행으로 인해 청정해안 환경에 복잡하고 치명적인 영향을 초래할 우려가 있다. 이에 본 연구에서는 외국에서의 여러 사례를 조사하고 해안선 침식방지는 물론 환경친화적이고 친수기능을 겸비한 종합적인 방재 대책공법으로 인공리프, 부유식 방파제 그리고 이중원통 케이슨식 방파제를 찾아내어 제안하고자 하였다. 제안된 방법은 수치모델을 통해 대상해역에 적용하여 그 결과를 비교하여 그 타당성을 평가해 보았다.

• 한국해안해양공학회지
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• 제2권4호
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• pp.183-189
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• 1990

방파제의 뒤에서 파랑이 회절될 때와 같이 여러 방향으로 전파되는 경우 파랑의 변형을 계산하기 위하여 각스펙트럼 모델이 개발되어왔다. 본 논문에서는 우선 각스펙트럼의 개념을 설명하고, 최근에 이를 토대로 하여 개발된 각스펙트럼 모델들을 소개한다.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
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• pp.169-174
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• 1999

The reclamation area of Saemangeum (Kunsan) located between 126$^{\circ}$10' -126$^{\circ}$50'E and and 35$^{\circ}$35'N -36$^{\circ}$05'N at the western coast of Korea. The construction of the 33km sea dike is building in the Saemangeum area. When the construction of the sea dike in the coastal region takes plase, there exists a certain amount of soil which is diffused by the tidal current. Behavior of the soil diffusion usually depends on its intrinsic characteristics, bathymetry, construction method and used mchinery. The amount of soil at the construction acts as a pollutant which is the cause of changing the marine environment. When the soil material is diffused , it may form a layer which obstructs the light passing into the sea and causes the extinction or alteration of the living beings on the sea bottom. The settlement of soil material could change the sea bottom deposit. The purpose of MITIGATION is to harmonize the development and the conservation of environment, to restrict environmental destruction and to reproduce the enviroment damaged by the construction in the coastal region. The purpose of this study is to find the method by which we minimize the anti-function of development in the coastal region. Tide and tidal current are calculated using a two-dimensional numerical model before the construction of sea dike in Saemangeum Bay. The numerical results are compared well with field observations. On the basis of these results, we caculated the tide and tidal current after the construction of the sea dike in order to investigate the change of the tide and tidal current after the construction of the sea dike. Moreover, we calculated the tide and tidal current after the construction of submerged breakwater in order to preserve the enviornmental condition of creature habitat . We compared the tide and tidal current before and after the construction of submerbed breakwater, to investigate the possbility of MITIGATION in the fisheries.

• 한국해양공학회지
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• 제35권4호
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• pp.296-304
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• 2021

Research on the development of marine renewable energy is actively in progress. Various studies are being conducted on the development of wave energy converters. In this study, a numerical analysis of wave-energy extraction performance was performed according to the body shape and scale of the sloped oscillating water column (OWC) wave energy converter (WEC), which can be connected with the breakwater. The sloped OWC WEC was modeled in the time domain using a two-dimensional fully nonlinear numerical wave tank. The nonlinear free surface condition in the chamber was derived to represent the pneumatic pressure owing to the wave column motion and viscous energy loss at the chamber entrance. The free surface elevations in the sloped chamber were calculated at various incident wave periods. For verification, the results were compared with the 1:20 scaled model test. The maximum wave energy extraction was estimated with a pneumatic damping coefficient. To calculate the energy extraction of the actual size WEC, OWC models approximately 20 times larger than the scale model were calculated, and the viscous damping coefficient according to each size was predicted and applied. It was verified that the energy, owing to the airflow in the chamber, increased as the incident wave period increased, and the maximum efficiency of energy extraction was approximately 40% of the incident wave energy. Under the given incident wave conditions, the maximum extractable wave power at a chamber length of 5 m and a skirt draft of 2 m was approximately 4.59 kW/m.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.300-310
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• 2008

A series of numerical simulations on the several types of breakwaters on the foundation systems utilizing buoyancy were carried out in plane-strain conditions using the modified Cam-Clay model and the Biot's consolidation theory. Improved foundation system by the replacement of original ground with light weighted material, expandable poly-styrene (called below EPS) and several foundation systems with buoyant cells were used. From the results of numerical simulations we found that the foundation systems utilizing buoyancy are efficient to reduce the maximum consolidation settlements without reducing lateral safety.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 토목섬유 특별세미나
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• pp.19-31
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• 2000

Geotextile container method is an environment-friendly construction method that is utilized to build up a breakwater and an underwater embankment, etc. using geotextile container, which is producted by filling the geotextile bag with sand or dredged materials. Geotextile containers are divided into geobags, geotubes and geocontainers based on their size and production method. In recent years, the number of application for the geotextile container method is rapidly increasing in the world, and the development of the effective construction method is focused. In this study, the application and the achievement of the geotextile container method will be introduced, and the practical construction examples and the trend of technology development in foreign country will be discussed.

• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2000년도 한국해안해양공학발표논문집 Proceedings of Coastal and Ocean Engineering in Korea
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• pp.1-23
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• 2000

This paper discusses the development of design methods for coastal structures and breakwaters in the United Kingdom, with particular attention to changes in research activities, publications, technology transfer and the use of research results over the last 200 years. The paper describes some examples of the design and construction of breakwaters and seawalls, methods by which their designs and construction techniques were improved, and how those improvements were promulgated within civil engineering. It discusses problems that arise from recent trends in research funding and publication, and seeks to indicate some possibilities for the future. The paper draws on the author's experience in research and specialist consultancy at HR Wallingford, published papers and books, but is also guided by lessons from related work in UK and elsewhere.

• 한국항만학회지
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• 제8권1호
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• pp.41-47
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• 1994

The present paper discusses the nonlinear wave deformation due to a submerged coastal structure. Theory is based on the frequency-domain method using the third order perturbation and boundary integral method. Theoretical development to the second order perturbation and boundary integral method. Theoretical development to the second order Stokes wave for a bottom-seated submerged breakwater to the sea floor is newly expanded to the third order for a submerged coastal structure shown in Figure 1. Validity is demonstrated by comparing numerical results with the experimental ones of a rectangular air chamber structure, which has the same dimensions as that of this study. Nonlinear waves become larger and larger with wave propagation above the crown of the structure, and are transmitted to the onshore side of the structure. These characteristics are shown greatly as the increment of Ursell number on the structure. The total water profile depends largely on the phase lag among the first, second and third order component waves.