• Title/Summary/Keyword: Harbor Structure

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Estimation for Changing of Hydraulic States Caused by Gate Expansion in Asan Bay (아산만 배수갑문 확장사업에 따른 아산만 해역의 수리특성 변화 검토)

  • Park, Byong-Jun;Song, Hyun-Ku;Song, Tae-Kwan;Jang, Eun-Chul
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03b
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    • pp.337-340
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    • 2008
  • The gate expansion was planed to increase discharge capacity of gate structure at sea dike in Asan Bay. So it was estimated for changing of hydraulic states in Pyeongteak Harbor Zone caused by gate expansion, by 2D and 3D CFD Module. In result, influence of gate expansion was less than tidal current and discharge ratio between old gate and new gate was 4:6.

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The Change of Coastal Water Area due to the Development of Mokpo Harbor and Construction of Daebul Industrial Complex(II) (木浦港 開發 및 大佛産業團地 造成에 따른 沿岸海域 變化(II) - 海上環境을 中心으로 -)

  • 이중우;정명선;민병언
    • Journal of the Korean Institute of Navigation
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    • v.16 no.1
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    • pp.37-64
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    • 1992
  • A study on the changes of the oceanographical environment caused by Mokpo coastal zone development was carried out. Special emphasis was placed on the clarification of the water level changes and coastal current structure and influence of the environmental factors on the coastal area. In order to understand the structure oceangraphical environemnt, such as water temperature, salinity, suspended solids, pH, dissolved oxygen, chemical oxygen demand, biochemical oxygen demand, distribution of bottom sediment, tide and current were measured. To investigated the structure of tide and current for the future development, a numerical analysis was carried out. In certain zones, it was found to be flooding problems near the lowlying commercial area.

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Comparative Study of Reliability Design Methods by Application to Donghae Harbor Breakwaters. 2. Sliding of Caissons (동해항 방파제를 대상으로 한 신뢰성 설계법의 비교 연구. 2. 케이슨의 활동)

  • Kim, Seung-Woo;Suh, Kyung-Duck;Oh, Young-Min
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.18 no.2
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    • pp.137-146
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    • 2006
  • This is the second of a two-part paper which describes comparison of reliability design methods by application to Donghae Harbor Breakwaters. In this paper, Part 2, we deal with sliding of caissons. The failure modes of a vertical breakwater, which consists of a caisson mounted on a rubble mound, include the sliding and overturning of the caisson and the failure of the rubble mound or subsoil, among which most frequently occurs the sliding of the caisson. The traditional deterministic design method for sliding failure of a caisson uses the concept of a safety factor that the resistance should be greater than the load by a certain factor (e.g. 1.2). However, the safety of a structure cannot be quantitatively evaluated by the concept of a safety factor. On the other hand, the reliability design method, for which active research is being performed recently, enables one to quantitatively evaluate the safety of a structure by calculating the probability of failure of the structure. The reliability design method is classified into three categories depending on the level of probabilistic concepts being employed, i.e., Level 1, 2, and 3. In this study, we apply the reliability design methods to the sliding of the caisson of the breakwaters of Donghae Harbor, which was constructed by traditional deterministic design methods to be damaged in 1987. Analyses are made for the breakwaters before the damage and after reinforcement. The probability of failure before the damage is much higher than the allowable value, indicating that the breakwater was under-designed. The probability of failure after reinforcement, however, is close to the allowable value, indicating that the breakwater is no longer in danger. On the other hand, the results of the different reliability design methods are in fairly good agreement, confirming that there is not much difference among different methods.

NUMERICAL ANALYSIS OF THE HYDRAULIC CHARACTERISTICS OF ICE-HARBOR TYPE FISHWAY (아이스하버식 어도 내 수리특성에 관한 수치해석연구)

  • Ko, S.H.;Choi, H.K.;Lee, H.B.;Rhee, S.H.
    • Journal of computational fluids engineering
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    • v.20 no.3
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    • pp.15-19
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    • 2015
  • A fishway is a structure on or around artificial and natural barriers, such as dams, locks and waterfalls, to help fishes' natural migration. In this paper, a computational fluid dynamics (CFD) code, termed SNUFOAM is used to analyze vertical hydraulic characteristic of rollway of fishway. Volume-of-fluid (VOF) method was used to handle free-surface. It is important to determine the factors influencing flow characteristics in fishway because fish use directional information from the flow characteristics to navigate through fishway. Fishway was modeled in 2-D and the influence of the stream velocity, slope, and weir height of fishway was tested. In results, the transition Reynolds number was $2{\times}10^5{\sim}3{\times}10^5$.

Analysis of the Structural Behavior of Soldier Pile Type Breakwater (가로널식 일자형 방파제의 구조거동 분석)

  • Han Sang Hun;Park Woo Sun
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.17 no.2
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    • pp.98-105
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    • 2005
  • A new type breakwater is developed for small scale harbors and fishing ports with low design wave and soft ground. The structure of the developed breakwater is similar to the soldier pile used in soil excavation. Structural performance of the new type breakwater can not be accurately evaluated by numerical analysis due to nonlinearity of joints between piles and honelasticity of soil support. Therefore, this paper investigates the structural performance of the breakwater with experimental method and compares the results with numerical analysis.

Performance Evaluation of Imote2-Platformed Wireless Smart Sensor Node for Health Monitoring of Harbor Structures (항만구조물 건전성 모니터링을 위한 Imote2 플랫폼 기반 스마트 무선센서노드의 성능 평가)

  • Park, Jae-Hyung;Kim, Jeong-Tae;Lee, So-Young
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.23 no.1
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    • pp.26-33
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    • 2011
  • In this study, a high-sensitive smart wireless sensor based on an Imote2 sensor platform is developed for structural health monitoring of harbor structures. To achieve the objective, the following approaches are implemented. Firstly, the smart wireless sensor based on the high-performance Imote2 sensor platform is designed to measure acceleration with high sensitivity from structures. Secondly, embedded software is designed for autonomous structural health monitoring. Finally, the performance of the smart wireless sensor is estimated from experimental tests on a lab-scaled caisson structure.

Performance Evaluation of Earthquake Resistant Caisson Type Quay Walls (케이슨식 안벽의 내진보강 성능 평가 -수치해석적 측면에서-)

  • 권오순;황성춘;박우선
    • Journal of the Korean Geotechnical Society
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    • v.16 no.4
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    • pp.129-139
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    • 2000
  • The liquefaction of reclaimed land generally caused the harbor facilities to hazards. In Korea, the major harbor quay walls are gravity type and the gravity quay wall is not a good earthquake resistant structure. Recently, various earthquake resistant quay walls have been suggested, but the study on the efficiency of reinforced quay wall was not much performed. In this study, numerical analysis is carried out for performance evaluation of easily adoptable earthquake resistant quay walls. The results of numerical analysis are compared with shaking table test that is performed at the same cross-section.

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Modeling of Fine Sediment Transport under Multiple Breakwaters of Surface-Piercing Type

  • Lee, J. L.;Oh, M. R.
    • Proceedings of the Korea Water Resources Association Conference
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    • 2004.05b
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    • pp.557-562
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    • 2004
  • A surface-piercing barrier model is presented for understanding morphological development in the sheltered region and investigating the main factors causing the severe accumulation. Surface-piercing structures like vertical barriers, surface docks and floating breakwaters are recently favored from the point of view of a marine scenario since they do not in general partition the natural sea. The numerical solutions are compared with experimental data on wave profiles and morphological change rates within a rectangular harbor of a constant depth protected by surface-piercing thin breakwaters as a simplified problem. Our numerical study involves several modules: 1) wave dynamics analyzed by a plane-wave approximation, 2) suspended sediment transport combined with sediment erosion-deposition model, and 3) concurrent morphological changes. Scattering waves are solved by using a plane wave method without inclusion of evanescent modes. Evanescent modes are only considered in predicting the reflection ratio against the vertical barrier and energy losses due to vortex shedding from the lower edge of plate are taken into account. A new relationship to relate the near-bed concentration to the depth-mean concentration is presented by analyzing the vertical structure of concentration. The numerical solutions were also compared with experimental data on morphological changes within a rectangular harbor of constant water depth. Through the numerical experiments, the vortex-induced flow appears to be not ignorable in predicting the morphological changes although the immersion depth of a plate is not deep.

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A Preliminary Study of the Seismic Damage Estimation for Harbor Sites (항만 구역 지진피해예측 평가방안에 관한 예비 연구)

  • Choi, Seung-Ho;Kim, Han-Saem;Yoo, Seung-Hoon;Chung, Chung-Ki;Jang, In-Sung
    • Journal of the Earthquake Engineering Society of Korea
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    • v.15 no.3
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    • pp.45-55
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    • 2011
  • In this study, the state of the art and characteristics of major Korean port structures were investigated and analyzed. Damage of port structures during earthquakes, evaluation systems of seismic damage and seismic designs have also been investigated. Based on the research, a methodology of seismic damage estimation was proposed considering geotechnical information and the characteristics of the fragility of port structures.

An Expremental Study on Connections Friction Test of Improvement for Coastal Environment Block (Coastal Environments 블록의 개발을 위한 연결부 마찰 실험)

  • Kim, Chun-Ho;Kim, Sang-Hoonq
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.49-52
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    • 2008
  • The plain and simple shape water front structure were designed and installed for wave protection and wave resistance. But the installation of these plain and simple structure cause deficiency of environmental affinity. Also the resonance phenomena from the reflective wave and shipwave of the harbor incident wave caused high tide and wave, consequently maintaining the tranquility of inside harbor, give difficulty for mooring the ship and loading-unloading, increase the possibility of ship collision at the quray wall and landing place To solve these problems, we develop the environmentally friendly wave dissipation block. And installation efficiency, stability of the blocks through experiment of C.E Block Joint.

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