• Economic and Environmental Geology
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• v.33 no.6
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• pp.447-467
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• 2000

This study was carried out geochemically and mineralogically to define how Kunsan shore sediments are related to their terrestrial source rocks in the region of Keum River Basin, western Korea. As a whole the chemical composition for major elements, trace elements and rare earth elements analysis from shore sediments and river bed sediments doesn't show the big difference, and especially rare earth elements chondrite normalized patterns are almost same. Heavy minerals of shore sediments are identified as hornblende, epidote, ilmenite, garnet, hematite, magnetite, sphene and rutile. Compared with Taean Area of Seo et al. (1998) and Byeonsan Area of Kwon et al. (1999), Kunsan shore sediments of this study area were origined mostly from Keum River Basin.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.12-17
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• 2006

Natural rivers have water purification functions called Gravel Contact Oxidation Process, which decontaminate river water by biological absorption, oxidation and degradation on riverbed gravels. This function has been developed and applied to many small/medium-sized urban rivers in Japan as one of the direct river water purification methods. However the method hasn't been verified in the tropics, which have different climate conditions and river characteristics. A preliminary experiment carried out at a polluted urban tributary in the outskirts of Kuala Lumpur, Malaysia where an increasing attention has been paid to river environment, showed a good applicability to the tropical conditions as a technically practical water purification measure with some maintenance cares for sludge management.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1313-1317
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• 2006

In this study, various hydraulic phenomena were analyzed from the dam model experiments and the analyzed results were compared with existing computation results. Sungduk dam model structures were constructed using Froude similarity law by 1:50 scale. From the measurements of hydraulic phenomena at spillway channel, an improvement method was trying to be suggested over shortcoming of existing design plan. The result of model experiment showed no big difference with that of each part's numerical interpretation. Sidewall overflows were observed, as water conveyance occurred due to the linear characteristics of spillways, which raised the necessity for improving the linear forms of spillways. Also, it was judged to be necessary improving load pressure and establishing protective structures at the riverbed grounds of downstream channels.

• Journal of Environmental Science International
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• v.5 no.4
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• pp.481-494
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• 1996

This study was performed to investigate the relationship between concentrations of heavy metals in sediment and the depths of 27 sampling sites along the West Nakdong river in downstream of Nakdong River. The deepest site was Kangdong bridge nearby 20ft. From here, the depth was shallowed to Chidong gradually. In each site the smaller mesh was, the liger concentration of heavy metal becomed. Concentration of Zn, Cd, Cr and Cu at inflow point of Shinoe stream was 576.016 ppm, 262.307 ppm, 68.674 ppm and 61.634 ppm, respectively, the concentration was the higest at this point. From here, it was lowered gradually. The concentration of heavy metal at inflow point of Joman river was 155.328 ppm, 56.485 ppm, 25.200 ppm and 31.172 ppm, respectively, those concentrations were liger than other points with the exception of Shinoe stream. Therefore, woman river and Shinoe stream were the major source of pollution in West Nakdong river. Among two sources Shinoe stream was more important source of pollution. West Nakdong river has become lake by Noksan floodgate because it's pollution has had influence on Bonglim.

• 한국신재생에너지학회:학술대회논문집
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• 2006.11a
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• pp.5-8
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• 2006

The Alternative energy has lately attracted considerable attention due to the high oil price and environment problem. In this study, pilot test facility for using the geothermal energy source from riverbank filtration was constructed and monitoring devices are installed to estimate the efficiency of this system. Initial installation cost can be saved efficiently by connect ing a heat pump system into the exist ing pumping well in Changwon riverbank filtration site. One set of monitoring results during summer was presented and analyzed.

• Environmental Engineering Research
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• v.10 no.4
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• pp.199-204
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• 2005

Experiments were performed to estimate the organic release from the aquifer soil in riverbank and/or riverbed filtration via a kinetic approach. Organic release was assumed as a reaction of first order regarding concentrations in both soil and water phases. The reaction rate constants were obtained by comparing the model predictions with the experimental data of organic release reaction and the equilibrium distribution of organic matter between water and soil phases. Results show that the organic release from the aquifer soil was not negligible under normal conditions in Korea reaching 4.7mg-COD/L-day. This indicates that manganese and iron start to be released from aquifer soil in the riverbank filtration in the middle reach of the Nakdong river if the travel time of the filtrate exceeds about 5 days. It was also seen that the COD of the soil organic matter was 0.89mg-COD/mg-OM and that 65% of the COD was BOD5.

• Journal of the Korean Society of Safety
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• v.13 no.4
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• pp.186-191
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• 1998

This study was investigated the distributions of heavy metal concentration in a soil near abandoned mine in Chung thong Nam Do. The abandoned mines were Gubong gold mine and Sinsung coal mine. The results were as follows : 1) The concentration of As and Pb in Gubong mine were 309.2mg/kg and 1163.5mg/kg, that is exceeded the countermeasure criteria. Cadmium concentration was 14.70mg/kg, that is exceeded anxiety criteria. But all items in Sinsung coal mine was detected below criteria. 2) The heavy metals contamination of riverbed soil by gold mine showed higher than coal mine. 3) The heavy metals contamination in the vicinal paddy and dry field soil area was higher than other mine. Arsenic concentration was 29.29mg/kg, that is exceeded the anxiety criteria as 10.22mg/kg.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.967-971
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• 2008

하상변화는 하천정비기본계획을 수립함에 있어 매우 중요한 고려사항 중에 하나이다. 이는 하상의 변화가 이 치수 및 생태계에 있어 큰 영향을 주기 때문이다. 적절하지 못한 하상변화의 예측은 기 축조된 하천구조물의 기능과 안정성을 위협하며, 이는 직접적으로 큰 경제적 피해를 일으킬 수 있다. 특히, 인공적으로 지어지는 댐과 같은 수공구조물의 축조는 하천의 상 하류간의 연결성을 끊어놓음으로서 자연상태에서의 유사이송 변화를 일으키며 이는 하천의 급격한(자연상태와 비교하여 비교적 단시간동안 일어나는) 하상변화의 주 원인으로 작용한다. 본 연구는 댐 축조에 의해 상류지역의 하상이 어떻게 변화하는지를 연구하기 위하여 대상지역으로 충주댐 상류 지역을 설정하였으며, 충주댐 축조 후 1996년 측량자료와 최근의 2007년 측량자료를 수집하여 충주댐 상류구간의 하상변화를 분석하였다. 또한, 현장에서 채취한 하상토 입도분포 자료와 관련 수문자료를 수집하여 Hec-Ras 와 Hec-6 프로그램을 이용하여 하상변화에 대한 모의 시뮬레이션 결과를 측량자료와 비교하여 댐 상류지역의 하상변화 특성을 도출하는 것을 목적으로 하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.938-942
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• 2008

본 연구에서는 안성천 하류부 하도준설에 따른 하천의 영향에 대해 분석하였다. 우선 준설에 따른 수위 하강 및 이로 인한 침수피해 저감효과를 추정하였다. 하도 준설에 따른 홍수위 변화를 모의하기 위해 1차원 하천수리모형인 HEC-RAS을 적용하였으며, 홍수위 변화에 따른 침수면적 및 침수심 산정을 위해 수치지도와 GIS를 이용하였다. 하도준설에 따른 수위 변동은 계획홍수량 및 유황에 따라 분석하였으며, 침수모의는 계획홍수량을 기준으로 침수면적 및 침수심을 산정하였다. 또한 준설에 따른 하상변동 영향을 추정하기 위해 준설후 5년, 10년, 20년의 퇴사분포를 모의하였다. 1차원 유사이동 모형인 HEC-6 모형을 이용하였으며, Yang공식, Toffaleti공식, 그리고 Laursen공식 등 세가지 유사이송 공식을 적용하였다. 모의구간은 진위천 상류부 궁안교 지점부터 안성천과 합류된 이후 팽성대교 지점까지이다. 경계자료로는 궁안교 상류부에 위치한 동연교 지점에서의 1987년$\sim$2006년까지 20년 동안의 수위자료와 환경부 유사량 실측자료를 이용하였다.

• Proceedings of the Korean Geotechical Society Conference
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• 2006.03a
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• pp.61-68
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• 2006

Cemented Sand and Gravel(CSG) is a material made by simple mixing of rock-based raw materials such as excavated soil and riverbed gravel together with cement and water. The use of CSG methodl for cofferdam and large dam is gradually increasing in Japan because a quarry and aggregate plants can be diminished. Also, the CSG method can reduce dam construction cost, construction duration and destruction of environment. In this paper, field test and test construction of CSG method was conducted on Hwabuk Dam. The mechanical properties of CSG, such as compressive strength, extention strength and field permeability test were investigated. From the results of the experimental study, application study of CSG method was discussed.