• Journal of Korean Society of Environmental Engineers
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• v.39 no.9
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• pp.495-504
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• 2017

An amphibious scrubbing/suction dredging machine with cylindrical rotating brush, housing, and turbidity barrier was newly-developed to remove both sediments with about 10 cm thickness and periphyton attached on various structures in urban water-circulating systems through the scrubbing, suction, and dredging processes. Based on the field application and long-term monitoring, the increase in both suspended solids (SS) and turbidity of water during the scrubbing, suction, and dredging processes was negligible (p>0.05). In some cases, the turbidity of water initially increased, however, the turbidity was stabilized within 20 minutes from the start of dredging processes. The concentration changes in TN and TP of water were not statistically different (p>0.05) before and after the scrubbing, suction, and dredging processes, indicating that benthic nutrients released from sediments were not significantly diffused, and were not supposed to cause significant water pollution. Also, water treatment facilities along with an amphibious scrubbing/suction dredging machine could be more effective since the removal of contaminant loadings through the scrubbing, suction, and dredging processes was much greater than that through simple coagulation/precipitation processes. Finally, GPS-based realtime tracking and operation program have been developed and applied in various urban water-circulating systems, and development of driver cooperative autonomous driving system is in progress to eliminate the need for manual driving of an amphibious scrubbing/suction dredging machine.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.4
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• pp.2883-2890
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• 2015

As the research about increasing the efficiency of dredging soil transport, the technology, which reduce the friction between pipe wall and fluid in the pipe and disturbed generating pipe blockage, has been developed. So for the purpose of applying this technology to real construction site, main test has been tried at the real scale test in field(500m dredging soil transport length). As a test result, this paper will show 30% flow efficiency increasing by permitted electro magnetic force to the pipe. And test result was evaluated as a ultra sonic velocity profiler.

• Journal of Korea Water Resources Association
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• v.34 no.3
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• pp.265-273
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• 2001

In this study, a hydrocyclone operated by centrifugal force was examined as a part of dredge system of lake sediments. It does not help dehydration of the sediments, but also enables the classification of fine particles in the stable and sanitary treatment. Several experiments were performed focusing on the separation efficiency under the condition of room temperature with virtual sediment samples and simulated particles. As a result of the experiment, it was found that the apex size of the cyclone greatly affected the cut diameter(d$_{50}$), and high density particles were separated more effectively.y.

• 한국지구물리탐사학회:학술대회논문집
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• 2002.09a
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• pp.163-178
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• 2002

Investigation of underwater sedimentary layers has been carried out with GPR (Ground Penetration Radar) survey. GPR survey has been proved to be very satisfactory since the target area has shallow water depth of about 2.5 m, is lake with no water flow, and the thickness of mud layer, which is a main survey target, is relatively thin. The results clearly showed the underwater sedimentary layers, which includes mud, sand, gravel and basement layer. Specially, the distribution and total amount of mud layers from the survey, which is main target of removal, can be used as a basic data for the dredging of mud layer in the area.

• The Journal of Engineering Geology
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• v.9 no.3
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• pp.267-280
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• 1999

인천 남동공단에서 약 9Km 떨어진 해상에 준설, 매립하여 조성된 3만평의 인공섬에 위치한 인천 LPG 수입기지 현장은 인천광역시와 수도권 지역에 민수용 LPG의 안정적인 공급을 하기 위하여 건설되는 LPG저장용 지하동굴 공사 현장이다. 저장 용량은 Propane가스 17만톤($34만5천\textrm{mm}^3$), Butane가스 7만톤($12만5천\textrm{mm}^3$) 이다. 지하저장시설은 대용량의 액화가스를 주변환경을 해치지 않으면서 화재나 전쟁, 지진등 재해로부터 안전하게 보호 하는데 가장 경제적이고 효율적이며, 운전 및 유지 보수 비용이 적게 드는데다 국토의 효율적인 활용과 공사비가 저렴하다는 장점을 갖고 있다.(중략)

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1078-1082
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• 2006

본 연구에서는 현재 날로 심각해지는 흥부지역 농업용수의 수질을 개선하기 위한 기본계획을 수립하는데 있어, 기초데이터의 확충 및 현황 파악을 위하여 흥부지구 강우시 저수지내의 퇴적물 상태를 조사 하고자 하였다. 또한 조사된 자료를 바탕으로 저수지 퇴적물에 의한 내부오염 발생여부 및 저수지의 수질에 미치는 영향을 예측하고, 퇴적물에 의한 오염 방지 및 필요수량을 안정적으로 유지하기 위하여 준설여부를 검토함으로 써 흥부지역 농업용수의 수질개선방안을 제시하는 것이 목적이다. 본 조사연구는 1) 저수지 내 퇴적물 추정량, 2) 퇴적물의 입도분포 및 유기물질 무기물질 분석으로 이루어졌다. 본 조사연구 결과는 퇴적물의 준설을 결정하는데 있어서 중요한 인자로 인식되는 저수지의 퇴적속도, 저수지 내 퇴적물의 용적량, 잠재적 오염물질의 함유량에 대한 연구 자료로서, 앞으로 흥부저수지를 효율적으로 관리함에 있어 중요한 근거자료가 될 수 있을 것으로 판단되며, 수질개선 사업의 수행 시 설계 인자로 반영 하고자 한다.

• Journal of the Korean Geophysical Society
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• v.5 no.1
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• pp.51-62
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• 2002

Investigation of underwater sedimentary layers has been carried out with GPR(Ground Penetration Radar) survey. FPR survey has been proved to be very satisfactory since the target area has shallow water depth of about 2.5 m, is a lake with no water flow, and the thickness of mud layer, which is a main survey target, is relatively thin. The results clearly showed the underwater sedimentary layers, which includes mud, sand, gravel and basement layer. Specially, the distribution and total amount of mud layers from the survey results can be used as a basic data for the dredging of mud layer in the area.

• Journal of Korea Water Resources Association
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• v.49 no.12
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• pp.971-980
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• 2016

In general, efficient operation of sediment sluicing is important in economical aspect. In this study, the efficiency of sediment sluicing by various operation at water surface elevation on multi-functional weirs were analyzed using Nays2DH, and we focused on the Dalsung weir at Nakdong river. The results of this study shows that, the same number of flushing channels and water gates were developed due to sediment sluicing, and sediment deposition occurred in upstream region of flushing channels. Also, the sediment sluicing efficiency increased by approximately 4.6% and sedimentation decreased by approximately 4.5% at EL. 14.5 m for operations on water surface elevation exceeding EL. 14.0 m. The mitigation of reservoir sedimentation and extension of maintenance dredging period are possible if the variation of sediment sluicing efficiency in various operation at water surface elevation during flood season are considered.

• Journal of Korea Water Resources Association
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• v.37 no.6
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• pp.467-477
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• 2004

Effective management of water resources in Korea becomes very important in recent years. Especially, the management of reservoirs cannot be over emphasized. The status of sediment deposit and the dredging records of agricultural reservoirs were examined to find out at e reservoir retention capacity could be raised more than 10% of the total volume of reservoirs in Kyungbook Province. Sediment prediction methods were developed by combining the estimation mothods of geomorphological characteristics and upslope contribution area in GIS, The estimated sediment depsit amount were compared with the dredging records for three agricultural reservoires. It was found that the distributed model with ‘Flow accumulation’ and ‘Multiple Flow Direction Algorithm’ gives good prediction results for mountaineous area.

• Journal of the Korean GEO-environmental Society
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• v.2 no.3
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• pp.47-56
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• 2001

In the present study, mainly to determine the embarkation time of equipment in dredged clay fills, an analytical approach is performed to predict a variation of the undrained shear strength in the outermost layer. In this approach, Gibson's non-dimensional linear constant defining the relationship between the void ratio and the effective stress is employed. Also in this approach, void ratios and settlements associated with the volume change due to the self-consolidation and the desiccation shrinkage are evaluated at various elapsed times based on the finite difference solution technique proposed by the authors(1999) and the developed computer program named as DSCON. Predicted results(water content ratio, unit weight and undrained shear strength) are compared with those of laboratory model tests conducted with soil samples obtained from the Koheung site. Based on the predicted undrained shear strengths, possible embarkation time of a equipment is also evaluated. In addition, further analyses are made to indirectly verify the efficiency of the analytical approach proposed in the present study using the PSDDF computer program which can consider the drainage efficiency.