• Title, Summary, Keyword: harbor construction

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The Construction Plan of Breakwater by the Numerical Simulation (수치시뮬레이션에 의한 방파제의 시공계획)

  • Kim, Kyu-Han;Yoon, Seong-Jin;Kim, Young-Bok
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.449-452
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    • 2006
  • The main external force of the harbor in east coast is wave. So, wave is the important cause of wave induced current and sediment transport due to wave in planning harbor structures. Therefore, it must be considered not only to secure the harbor tranquility but also the sediment transport due to wave induced current in planning the harbor. In this study, we studied on the influences of construction procedure on harbor tranquility and siltation using annual coastal line data and bathymetry data near breakwater. And it suggests that the construction procedure for the harbor tranquility and the best way for the decrease of harbor siltation.

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Prediction of a Flushing Rate in an Embayment System for Construction of an Environmentally Sound Harbor (환경친화적 항만건설을 위한 항내 희석률 예측)

  • Jeong, Mi-Hoon;Park, Seok-Soon
    • Journal of Environmental Impact Assessment
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    • v.9 no.3
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    • pp.215-228
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    • 2000
  • This paper presents a novel method to predict a flushing rate in an embayment system, which can be utilized to assess an environmental impact caused by harbor construction. The method was successfully applied to the Ulsan-Onsan coastal area. The flushing rate was computed on the basis of water quality changes predicted by US Army Corps of Engineers' RMA-2/RMA-4 models. After calibration and verification to the measured tidal elevation and current velocity, the model was used to estimate the flushing rate in the proposed harbor. The water quality was simulated for 96 hours and the flushing rate was computed. The results indicated that the proposed harbor would significantly reduce the flushing rate in the Onsan harbor, especially at the small embayment area near the south breakwater. The flushing rate was evaluated for several alternatives, of which the tidal flow channel of 1,000 $m^2$ in the south pier appeared to be the best mitigation measure. This study proposes that the prediction of flushing rate would be a novel method to assess a water quality impact caused by harbor construction.

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Simulation of Tidal Flow and Water Quality in Onsan Harbor System (온산 항만 시스템에서 조류와 수질 변화 시뮬레이션)

  • Kim, So-Yeon;Park, Seok-Soon
    • Journal of Environmental Impact Assessment
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    • v.8 no.3
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    • pp.13-22
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    • 1999
  • Tidal flow and water quality were simulated in this paper to assess environmental impact caused by pier construction projects in Onsan harbor system. The Surfacewater Modeling System (SMS) was applied to the Onsan harbor system, where coastal reclamation and dredging were planned to build the piers. A finite element mesh was constructed and refined to cover the complicated geometry of the Onsan harbor and the proposed reclamation area. The time variable change of tidal height at harbor inlet was given as an input condition to tidal simulation. The water quality simulation was based on the discharge rate of suspended solids at the reclamation area. The simulation results have shown reasonable agreements with real situations in both tidal flow and water quality. According to the proposed plan, tidal flow and water quality were predicted during and after the pier construction. The tidal simulation study showed that there would be no discernible change of tidal current in the harbor except for the dredged area. The water quality simulation, however, predicted that suspended solids would increase significantly near the reclaimed and dredged areas during construction.

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Analysis of Construction Procedure of Breakwater in consideration of Harbor Siltation (항내매몰을 고려한 방파제의 시공순서 검토)

  • Yoon, Seong-Jin;Kim, Kyu-Han
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.19 no.1
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    • pp.73-80
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    • 2007
  • The predominant factor considered in the design of harbors in the East Coast of Korea is wave propagating onshore. Also, the strong wave induced current on the east coast have the biggest influence on sediment transport around the harbor structure. Therefore, a consideration of wave induced current due to waves should take place on design when constructing a harbor on east coast. In this study, we studied on the influences of construction procedure on harbor siltation using annual coastal line data and bathymetry data near breakwater. And, this study focused on investigation of the construction procedure for the best way to decrease harbor siltation.

A Simulation of Wave Induced Current Around the Jeju New Harbor (제주외항 건설에 따른 주변 해역의 해빈류 변화 예측)

  • Kwak, Moon-Su;Pyun, Chong-Kun
    • Journal of the Korean Society of Hazard Mitigation
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    • v.4 no.3
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    • pp.1-8
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    • 2004
  • In this study, the change of the current in the coastal zone before and after the construction of Jeju new harbor was predicted by using the numerical model, which uses Hardy-Cross method. The numerical model was carried out for the present state, before the construction, and the state after the construction, and for the wave direction the NNW direction for winter and NE direction for summer were tested so that the seasonal change may be considered. The computation result shows that a large amount of the wave induced current was occurred when there were high waves coming in from NNW direction before and after the construction. Also, before the construction a longshore current occurred moving from the west to the east at the new harbor construction site so that it formed a rip current in the Hwabuk-dong front sea. And also, after the construction, the tip current produced changed into nearshore circulating current and a small circulating current appeared at the harbor entrance. On the other hand, at Samyang 4each, which is 3.0km away from the new harbor in the NE direction, shows that there was a longshore current occurred from the west to the east, which is in the opposite direction the new harbor, and the effect on the new harbor by sediment transport at Samyang beach is thought to be very small.

The Hydro-Environmental Characteristics of Port Facilities around the Sea of Cheju Island (제주해역 항만시설물의 수리환경적 특성에 관한 연구)

  • 정태욱;김종인;류청로
    • Journal of Ocean Engineering and Technology
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    • v.14 no.3
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    • pp.1-10
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    • 2000
  • In order to effective manage the construction, disaster prevention plan and the harbor tranquility control, meteorological and sea-state characteristics around Cheju Island have been analyzed. Using results and damage examples of the port facilities under severe sea conditions, a reasonable construction control plan considering the regional characteristics of the sea-state and winds was proposed. That is, in northern part of Cheju Island, the construction work is affected mainly by the winter storms, while the typhoon mainly affects the southern part port facilities during summer to Autumn. Considering their typical characteristics, it is strongly suggested that the main construction work should be carried out during April to July in the northern part, and it should be made during October to next July in the southern part of the island. A permeable TTP mounded breakwater was constructed to protect severe waves as a temporal structure under the long-term development plan in Sogipo port. The transmission characteristics of the structure was discussed using the experimental results. The results show that the transmission coefficient $K_{t}$ is over 20% of incident waves, which cause many problems in the cargo handling in relation to harbor tranquility. In conclusion, this kind of permeable structure can be used only as a temporal structure for the disaster prevention under the construction process. It causes many problems in harbor tranquility if it is used as a permanent harbor structures.s.

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Analysis of pollutant dispersion mechanism by restored canal at Dongbin harnor (수로의 복원으로 인한 동빈내항에서의 오염확산 양상의 해석)

  • Park, Seong-Soo;Cho, Yong-Sik
    • 한국방재학회:학술대회논문집
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    • pp.187-190
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    • 2008
  • The water quality at the Dongbin Harbor at Pohang city, is getting worse due to the sewage and the wastewater from communities. In this syudy, RMA2 and RMA4, which is two-dimensional depth-averaged finite element numerical model, were employed to simulate the improvement of water quality from inflowing water through an inland canal to be planned connecting Dongbin Harbor and the Hyeongsan River. For the comparative result of the numerical model, both the present condition and the restoration condition (after construction of an inland canal) is simulated. The results of these conditions reasonably simulate a real situation at the Dongbin Harbor. After construction of an inland canal, the water quality at the Dongbin Harbor will be compared to the fresh water quality of the Hyeongsan River at the steady state. Futhermore, The result of simulation will be used to decide the most effective dimension of the canal.

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Experimental Evaluation of Construction Performance and Long-term Settlements in Soft Ground Breakwater (연약지반 방파제의 시공성능 및 장기침하에 관한 실험적 평가)

  • Kwon, O-Soon;Jang, In-Sung;Park, Woo-Sun;Yum, Ki-Dai
    • Ocean and Polar Research
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    • v.25 no.spc3
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    • pp.385-392
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    • 2003
  • A new type of soft ground breakwater was recently developed, which does not need ground improvement because of light weight and structural characteristics. The various studies about consolidation settlements and lateral behavior of proposed soft ground breakwater have been conducted. But, the systematic investigations on the construction performance and long-term settlements of new type breakwater has not been accomplished. In this study, construction simulation of soft ground breakwater with soil box model test and experiments of the long-term wave loaded breakwater were performed. The results of test shows that it is possible to compensate differential settlements by dead loading and/or suction pressure, and to reduce the consolidation settlements by preloading method. It was also found that the vertical and lateral displacements of long-term wave loaded breakwater were negligible.

A Study on the Analysis of Water Waves and Harbor Oscillations due to the Development of Pusan Harbor (부산권개발에 따른 파괴분석과 해면부진동에 관한 연구)

  • 이중우;김지연
    • Journal of Ocean Engineering and Technology
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    • v.5 no.1
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    • pp.25-34
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    • 1991
  • An accurate estimation of water level variation when thewaves propagate to the coastal regionis very important for the port and harbor development plan. This study describes the application of a hybrid element model to harbor oscillation problem due to the construction of shore structure and implementation of shore boundary. The site selected is Pusan Harbor area with the third development and the Artificial Island plan. The observed water level changes at the site are compared with the result of the numerical experiment. The model gives a very important prediction of water level changes for navigation and harbor design.

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The Change of Coastal Water Area due to the Development of Mokpo Harbor and Construction of Daebul Industrial Complex(I) (목포항 개발 및 대불 산업단지 조성에 따른 연안해역 변화(I)- 해면 정온도를 중심으로 -)

  • 이중우;정명선
    • Journal of the Korean Institute of Navigation
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    • v.15 no.2
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    • pp.87-96
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    • 1991
  • The change of water level at Mokpo Harbour and its adjacent coastal area due to the construction of the Youngsan Estuary Barrage and the Third Land Reclamation Work of estuary barren had been roughly expected. Periodical floods, which occur 2 times per month, are also being observed at the low lying commercial areas near the Mokpo Old Harbor. Although it is said that the highest tidal current component among the tidal current records at the approaching channel to Mokpo Harbor is reduced to 6 kts, because of the esturary barrage, they do not give any precise statement or a deep analysis for the flooding and periodical water level change under certain environmental conditions. Moreover, they never tried the analysis of development plan considering the natural disaster such as typhoon or other extreme conditions. Thus, it is necessary to collect and analyze the data related to floodings, harbor oscillations, currents, and water quality , etc. because of the development considering the extreme condition. Thus, it is necessary to collect and analyze the data related to floodings, harbor oscillations, currents, and water quality, etc. because of the development considering the extreme condition and to evaluate the field observation and measurement, including the numerical model simulation based on the scientific approaches. This study deals the problem of the water level change among the integrated analyses of the coastal area changes. The result can be used for the integrated planning to give a strong foundation and it will contribute to the development of local area.

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