• 한국항해항만학회지
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• 제30권10호
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• pp.825-831
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• 2006

본 연구는 준설선을 이용하여 가덕수도를 횡단하며 준설공사를 하는 동안에 선박들의 안전한 통항방안을 제시하는 것을 목적으로 한다. 부산-거제간 연결도로 건설공사 중 가덕수도의 해저로 횡단하는 침매터널을 건설하기 위해서는 준설작업이 필요하다. 이에 따라 불가피하게 준설선이 가덕수도 항로를 횡단하며 준설을 해야 한다. 이는 상대적으로 가덕수도를 통항하는 선박들의 잠재적인 위험상황으로 충돌 등의 해양사고가 발생할 가능성이 있다. 따라서 이에 대한 선박의 안전통항방안을 모색하고 대책을 제시하였다. 먼저 해상교통량을 추정하고 교통혼잡도를 평가한 결과 장래(2009년)까지 주간 중에 통항량이 최대통항능력에 대비하여 20%미만으로 예상되었다. 그리고 항로설계원칙의 검토를 통해 임시항로를 설정하여 준설공사를 3단계로 나눠 실시하는 대안을 제시하였다. 끝으로 부산신항 VTS 센터의 역할을 강조하였다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 추계학술대회 논문집(제1권)
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• pp.509-514
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• 2006

본 연구는 준설선을 이용하여 가덕수도를 횡단하며 준설공사를 하는 동안의 선박들의 안전한 통항방안을 제시하는 것을 목적으로 한다. 부산${\sim}$거제간 연결도로 건설공사 중 가덕수도의 해저로 횡단하는 침매터널을 건설하기 위해서는 준설작업이 필요하다. 이에 따라 불가피하게 준설선이 가덕수도 항로를 횡단하며 준설을 해야 한다. 이는 상대적으로 가덕수도를 통항하는 선박들의 잠재적인 위험상황으로 충돌 등의 해난사고가 발생할 가능성이 있다. 따라서 이에 대한 선박의 안전통항방안을 모색하고 대책을 제시하였다.

• Water Engineering Research
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• 제1권2호
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• pp.137-146
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• 2000

A windows-based software package, named DREDGE, is developed for estimating sediment resuspension and contaminant release during dredging operations. DREDGE allows user to enter the necessary dredge information, site characteristics, operational data, and contaminant characteristics, then calculates an array of concentration using the given values. The program mainly consists of the near-field models, which are obtained empirically, for estimating sediment resuspension and the far-field models, which are obtained analytically, for suspended sediment transport. A linear equilibrium partitioning approach is applied to estimate particulate and dissolved contaminant concentrations. This software package which requires only a minimal amount of data consists of three components; user input, tabular output, and graphical output. Combining the near-field and far-field models into a user-friendly windows-based computer program can greatly save dredge operator's, planners', and regulators' efforts for estimating sediment transports and contaminant distribution.

• 수산해양기술연구
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• 제43권2호
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• pp.140-148
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• 2007

This paper describes on the real-time monitoring of dredging information for grab bucket dredger equipped with winch control sensors and differential global positioning system(DGPS) using electronic chart display and information system(ECDIS). The experiment was carried out at Gwangyang Hang and Gangwon-do Oho-ri on board M/V Kunwoong G-16. ECDIS system monitors consecutively the dredging's position, heading and shooting point of grab bucket in real-time through 3 DGPS attached to the top bridge of the dredger and crane frame. Dredging depth was measured by 2 up/down counter fitted with crane winch of the dredger. The depth and area of dredging in each shooting point of grab bucket are displayed in color band. The efficiency of its operation can be ensured by adjusting the tidal data in real-time and displaying the depth of dredging on the ECDIS monitor. The reliance for verification of dredging operation as well as supervision of dredging process was greatly enhanced by providing three-dimensional map with variation of dredging depth in real time. The results will contribute to establishing the system which can monitor and record the whole dredging operations in real-time as well as verify the result of dredging quantitatively.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2000년도 추계학술대회논문집
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• pp.95-107
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• 2000

The primary purpose of dredging work is to maintain navigational readiness and to increase environmental amenity, so that the dredging project which is composed of excavating, removing, transporting, storing and disposing dredged material must be carefully managed to insure that dredging works are completed in a cost-effective and environmentally safe manner. The most important point in dumping operations is an estimating and reducing the impacts of discharges at the dumping area. One of the most effective method for the reduction of ecological impacts at dumping area is using the schematic process composed of the sophisticated plan, precise work and predicting/reducing the impacts based on the numerical model and field observation. In this study, the numerical model is used to predict the near-field spatial fate and begavior of effluent discharged from Confined Dumping Facility(CDF) located near coastal area. To to this purpose, reappearing of tidal current was preceded. The model is then applied to Mokpo harbor, where capital dredging and maintenance dredging are conducted simultaneously and the CDF is under construction;. In the series of model case study, we found that the near-field behavior of effluent discharged from CDF was governed by the receiving water condition, outfall geometry, characteristics of efflent and CDF operating conditions.

• 한국항만학회지
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• 제14권4호
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• pp.429-439
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• 2000

The primary purpose of dredging work is to maintain navigational readiness and to increase environmental amenity. Therefore the dredging project, which is composed of excavating, removing, transporting and storing or dumping dredged material, must be carefully managed to insure that dredging works are completed in a cost-effective and environmentally safe method. The most important point in dumping operations is evaluating and decreasing the impacts of dumping works at the dumping area. One of the most effective method for this purpose is using the schematic process composed of the sophisticate plan, precise work and predicting/reducing the impacts based on an numerical model being closely linked with field observation. In this study, a numerical model is used to predict the spatial transport and fate of the effluent discharged from the confined dumping facility(CDF) located at a coastal area. To achive this purpose, numerical models were used for reappearing the tidal current of concerned area. These models were then applied to Mokpo harbpr where capital dredging and maintenance dredging are being conducted simultaneously and the CDF is under construction. In series of model case study, we found that the effluent discharged from CDF was governed by the receiving water condition and outfall geometry, so that limit of near-field was 14∼500 meter down stream and 4∼150 meter in transverse direction. dilution ranged from 1.1 to 8.2 on the cases. Long-term diffusion characteristics was governed by the dilution rate during near-field behavior, ambient conditions and CDF operation modes.

• 한국환경과학회지
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• 제22권9호
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• pp.1115-1129
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• 2013

The study area is located on the western coast, and the inner development construction has been ongoing since 2011. The purposes of current study are to effectively simulate and quantitatively predict a temporal and spatial distributions of water temperature and salinity due to the stages of inner development construction in saemangeum reclaimed area. The transient-state numerical modeling using EFDC model is done, and the numerical simulation results are validated reasonably by repetitive numerical model calibration procedures with respect to field measurements of water temperature and salinity. The spatial distributions of water temperature and salinity show similar trends before and after construction of the dikes. In spring season, the salinity has maximum value of 21 psu, while, in summer season, the salinity shows 7 psu in a whole modeling domain. Thus, it is clearly observed that salt water is replaced by freshwater. However, the salinity and temperature reach their initial conditions at the end of the year. The salinity after construction of the dikes is lower than that before construction of them at Mankyeong area. On the other hands, after construction of the dikes, the salinity after dredging operations is higher than that before dredging. Because drastical increasing of water volume in Saemangeum Lake leads to increasing of stagnation time at bottom layer, and salt water is easily intruded to the two estuaries. Therefore, it may be concluded that hydrodynamic characteristics on Saemangeum are dominated by either Mankyeong and Dongjin discharge or sluice gates in/out-flow amounts, and thus they must be properly considered when rigorous and reasonable predictions of water temperature and salinity according to the stages of inner development construction.

• 한국수산과학회지
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• 제30권5호
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• pp.730-743
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• 1997

본 연구는 광양제철소 건설을 위해 매립과 준설이 행해지고 있던 시기인 1983년 8월과 1984년 2월에 이와 같은 대규모의 환경교란이 다모류 군집 구조 및 분포에 미치는 영향을 알아보기 위해 실시되었다. 여름철의 다모류 군집은 총 76종이 출현하였으며, 평균밀도는 $342\;ind.{\cdot}m^{-2}$, 겨울철에는 76종, $437\;ind.{\cdot}m^{-2}$의 밀도를 보였다. 종수 및 밀도의 지역적인 분포 양상은 섬진강 하구역에서는 낮은 종수와 다양도, 수로지역에서는 높은 출현종수와 다양도, 그리고 묘도 서쪽 내만역에 서는 종수, 다양도, 밀도 모두가 중간정도의 값을 기록했다. 하계 다모류군집의 집괴분석 결과 5개의 정점군으로 나눌 수 있었으며, 이런 결과는 광양만에서의 다모류 군집이 섬진강에서 유입되는 담수 및 퇴적환경과 밀접한 관계가 있음을 보여주고 있다. 그러나 겨울철 군집의 분석 결과는 하계와는 다소 상이 한 결과를 보였다. 우점종의 조성에 있어서도 1982년도의 조사시 (Choi and Koh, 1984) 우점종이던 Lagis bocki와 Chone teres가 다모류군집내에서 차지하는 비율이 감소한 반면 본 조사시에는 Glycinde gurjanovae와 Heteromastus filiformis의 개체군은 점차 증가하는 결과를 보였다. 이와 같은 결과를 Shin and Koh (1990)와 Jung et al. (1995)의 결과와 비교해 볼 때 광양만에서 행해진 대규모의 매립 및 준설은 저서 다모류군집에 영향을 주고 있으며, 본 조사기간 동안에는 저서다모류 군집이 서서히 변해가는 과정중의 중간단계에 처해있는 것으로 판단된다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 가을 학술발표회 논문집
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• pp.217-222
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• 2000

An understanding of the behaviour of soft clay soils is important in a large number of civil engineering applications, including dredging operations, land reclamation and slurry management such as disposal and storage. Although the details of the behaviour depend on parameters such as the soil mineralogy, the pore water chemistry, the organic content and the microbiology, there are general features that are typical in many cases. The purpose of this paper is to present and discuss some of evaporation and desiccation observed in laboratory experiments under controlled conditions. Desiccation of dredged material is basically removal of water by evaporation which is controlled by weather and material type, etc. This study shows that (1) solar radiation, (2) wind velocity, (3) material depth, (4) trench depth are important factors in desiccation of dredged ultra soft clay.

• 상하수도학회지
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• 제25권3호
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• pp.349-357
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• 2011

This study has an objective to estimate effect on water-quality enhancement by removal of contaminated river-bed material using a two-dimensional numerical modeling in the Seonakdong River, the Pyunggang River and the Maekdo River. RMA2 and RMA4 models were used for flow and contaminant transport simulation, respectively. After the analysis of the effects of flow restoration plan for the Seonakdong River system made by Lee et al (2008), simulation have been performed about scenarios which contains operations of the Daejeo Gate, the Noksan Gate, the Makdo Gate (on planning), and the Noksan Pumping Station. Because there is no option for elution from bed sediment in the RMA4 model, a simple technique has been used for initial condition modification for elution. The analyses revealed that the effect on water quality improvement due to dredging of bed sediment seemed to be less than 10 % of the total effect. The most efficient measure for the water quality improvement of the river system was the linked operation of water-gates and pumping station.