• 한국해양공학회지
• /
• 제20권4호
• /
• pp.43-49
• /
• 2006

Detailed investigations were carried out on the stability of the dredged soil bed against wave actions, aimedat establishing the design method of artificial tidal flats using dredged soil. The soil was dredged at Nagoya port, Japan, and has a mean grain size of 0.013mm. Basic features of artificial dredged soil bed against wave actions were explained from a series of model experiments in a wave flume. The two types of section shapes were employed; one is a horizontal bed and the other is a sloped one. Changes of the bed profile, shear strength, grain size distribution and water content, according to the wave actions, were measured in detail. The cumulative effect of the wave actions, over about one week, was investigated. A dredged soil bed moves withthe wave actions with relatively small wave height. It should be especially. noted that the clay component is dissolved and flown out, away from the surface layer, and consequently the surface layer hardens, as if it is covered with sand. Wren the wave height is gradually increased, the bed is not liquefied and the shear strength of the dredged bed is increased by a wave-induced dissipation of pore pressures in the bed and a decrease of clay component by the wave-induced leakage.

• 한국항해항만학회지
• /
• 제38권4호
• /
• pp.421-427
• /
• 2014

In order to protect coastal facilities mainly from wave and current actions, the self-locking eco blocks constituting elements of protecting shore structures against scouring were designed. These blocks are adapted to the sloping bottom, coastal dunes, and submerged coastal pipelines, counteracting the destructive and erosive impulse action. A series of laboratory experiments has been conducted to investigate the reflection of water waves over and against a train of protruded or submerged shore structures and compare the reflecting capabilities of incident waves including wave forces. In this study the hydraulic model experiment was conducted to identify the performance of newly designed water affinity eco blocks to keep the coast slope and bottom mound from scouring by reduction of the wave reflection and to convince stability of the block placement. Revised design of each block element was also tested for field conditions. From the result of experiments, the field applicability of the developed blocks and placement was discussed afterward.

• 한국해안해양공학회:학술대회논문집
• /
• 한국해안해양공학회 2002년도 한국해안해양공학발표논문집 Proceedings of Coastal and Ocean Engineering in Korea
• /
• pp.1-13
• /
• 2002

For design of maritime structure, it is necessary to evaluate the effect and stability of the structure against wave action. Laboratory model experiments and their empirical formulas are mainly used to estimate those at present, although empirical formulas have a problem of accuracy and hydraulic experiments of cost and duration. In addition, performance-based design, which may be popularized as a new design concept in the near future, requires much more information than that obtained by empirical formulas and laboratory tests. Thus, numerical simulation may become more important hereafter for structure design. (omitted)

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2013년도 춘계학술대회
• /
• pp.270-272
• /
• 2013

해안시설물을 주로 파랑과 흐름의 작용으로부터 보호하기 위하여 세굴 방호시설물의 구성요소인 자체연결의 바이오 블록을 디자인하였다. 이 블록은 해저경사면, 해빈, 해안저면에 적응하여 파랑의 충격 및 침식작용에 대응하도록 하였다. 수면상 및 해저에 설치시 일련의 수리실험을 통해 파의 반사를 조사할 필요가 있었으며 입사파에 대한 반사성능 및 파력의 비교도 필요하다. 본 연구에서는 새로 설계한 바이오 블록의 설치로 반사계수를 줄임으로써 해안경사 및 해저면을 세굴로부터 보호하고, 설치한 블록의 안정성을 확인하기 위하여 수리모델실험을 수행하였다. 또한, 블록의 각 요소를 개량한 디자인에 대해 현장여건을 고려하여 시험하였다. 실험의 결과로부터 개발한 블록의 현장적용성과 거치방안이 후속으로 논의될 것이다.