• Journal of Environmental Impact Assessment
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• v.23 no.5
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• pp.406-416
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• 2014

When abnormal taste and odor were detected in the tap water of the North-Han river watershed during the dry season in late 2011, excessive nutrients with algal growth in the Lake Uiam and weather factors were considered to be among its causes. The nutrients, in particular, originated from domestic sewage in the Chuncheon area. This study was conducted to investigate relations between the algal growth in the Lake Uiam and the contribution of nutrients from public sewage treatment works (PSTWs) in Chuncheon city, and based on this to analyze the environmental impact. Nutrients in the Lake Uiam have already been accumulated to the level of eutrophication. Even in winter, the conditions in the lake such as retention time and water temperature were favorable to boost algal growth. After phosphorus treatment processes were introduced, the PSTWs in the Lake Uiam watershed were able to reduce the total phosphorus loads by 43%. The algal concentrations in the Lake Uiam also dropped by about 7%. The nitrogen treatment efficiencies in the PSTWs, on the other hand, remained almost the same after the introduction of the phosphorus treatment processes. To solve these problems more efficiently, it is necessary to develop management strategies for the upstream area of the Lake Uiam and set plans to improve nitrogen treatment operation and management for the PSTWs in Chuncheon.

• Korean Journal of Ecology and Environment
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• v.46 no.4
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• pp.488-498
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• 2013

A three-dimensional hydrodynamic model was applied to the Lake Euiam. The lake has three inflows, of which Gongji Stream has the smallest flow rate and poorest water. The dam-storage volume, watershed area, lake shape and discharge type of the Chuncheon Dam and the Soyang Dam are different. Therefore, it is difficult to analyze the water plume and mixing pattern due to the difference of the two dams regarding the amount of outflow and water temperature. In this study, we analyzed the effects of different characteristics on temperature and conductivity using the model appropriate for the Lake Euiam. We selected an integrated system supporting 3-D time varying modeling (GEMSS) to represent large temporal and spatial variations in hydrodynamics and transport of the Lake Euiam. The model represents the water temperature and hydrodynamics in the lake reasonably well. We examined residence time and spreading patterns of the incoming flows in the lake based on the results of the validated model. The results of the water temperature and conductivity distribution indicated that characteristics of upstream dams greatly influence Lake Euiam. In this study, the three-dimensional time variable water quality model successfully simulated the temporal and spatial variations of the hydrodynamics in the Lake Euiam. The model may be used for efficient water quality management.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.2
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• pp.171-179
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• 2022

In this study, the characteristics of algae mitigation according to dam operation were quantitatively analyzed for Uiam Lake, where the Chuncheon Dam is located upstream of the main stream, Uiam Dam is located downstream, and Soyang Dam is located in the tributary stream. Nine dam operation scenarios were applied to the event of the summer of 2018 (at that time an algae alert occurred) using the EFDC model, which is capable of calculating three-dimensional hydrodynamics and water quality levels such as those associated with chlorophyll-a. The dam operation scenarios were set to generate a flushing effect via discharges in the form of pulse waves from the upstream dams and by lowering the water level at the downstream dam. At Uiam Lake, the flushing effect was different depending on the operation of the dam, and the amount of algae reduction at each point was different owing to topographic characteristics and the different base water temperatures from BukHan River and Soyang River. With regard to a point located on the left bank, it was predicted that the peak level of chlorophyll-a would be reduced by approximately 50 % or more upon pulsed discharge at 50 m³/s for three days at Soyang Dam. However, for the right bank, the amount of discharge from Soyang Dam had little effect on algae mitigation. Therefore, an appropriate dam operation could be effective for algae mitigation at specific points in the water body where large dams exist upstream and downstream, such as at Uiam Lake, in an emergency situation in which algal blooms rapidly.

• Journal of Wetlands Research
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• v.14 no.3
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• pp.429-438
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• 2012

Han River is very important as a source of drinking water in metropolitan area. This study was conducted to figure out diversity and dynamics of plankton community in the seven lakes (lakes Paro, Chunchon, Soyang, Uiam, Chungpyung, Paldang, Chungju) of Han Riversystem. A total of 76 genera and 121 species were investigated by taxonomic identification in November 2008. Cyclotella sp. and Microcystis sp. was a dominant species in lake Paro and Chungju respectively. Aulacoseira granulata was dominant in lakes Chunchon, Paldang and Chungpyung. And Fragilalia crotonesis was a dominant species in lake Soyang and Uiam. Our results can be useful when compared to the results using molecular biological method to supplement taxonomic identification.

• Journal of Radiation Protection and Research
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• v.40 no.4
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• pp.223-230
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• 2015

The objective of this study is to identify the radionuclide distribution in public water by carrying out the analysis of artificial radionuclides($^{134}Cs$, $^{137}Cs$, $^{239+240}Pu$), natural radionuclide($^{210}Pb$) and TOC in the lake Euiam sediment in Chuncheon, South Korea. The $^{134}Cs$ concentration in all lake sediments showed below MDA values, and the $^{137}Cs$ concentration in lake sediment were ranged from MDA to $8.79Bq{\cdot}kg^{-1}-dry$. The $^{137}Cs$ concentrations in surface sediment were reported to be 2.4 to $4.2Bq{\cdot}kg^{-1}-dry$. The lowest concentration of $^{137}Cs$ was reported at St. 4 and the highest concentration was reported at St. 3, respectively. The $^{239+240}Pu$ concentration in lake sediment were ranged from 0.049 to $0.47Bq{\cdot}kg^{-1}-dry$. The lowest concentration was reported at St. 2 and the highest concentration was reported at St. 3. The correlation(r) between the $^{239+240}Pu$ concentration and $^{137}Cs$ concentration in lake sediment presented higher values (0.54 to 0.97) and this suggests the behavior and origin of $^{137}Cs$ is identical to the $^{239+240}Pu$ in the sediment. The $^{134}Cs$ concentration below MDA value and the $^{239+240}Pu/^{137}Cs$ ratio(mean value of 0.041) indicated that the artificial radionuclides in the sediment were originated from global fallout by the atmospheric testing of nuclear weapons conducted by former USSR and U.S.A, but not from the Fukushima Daiichi NPP accident. The sedimentation rate derived from $^{210}Pb$ age-dating method at St. 2 is calculated to be $0.31{\pm}0.06cm{\cdot}y^{-1}$. This value is similar to the value ($0.41{\pm}0.05cm{\cdot}y^{-1}$) estimated from the $^{137}Cs$ maximum peak produced from early 1960's. The content of TOC in lake Euiam sediments varied from 0.20 to 13.01%. While the highest correlation between TOC and $^{137}Cs$ concentration in the sediment were found at St. 1, the others presented the low correlation.

• Proceedings of the Zoological Society Korea Conference
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• 1997.10b
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• pp.152.1-152
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• 1997

• The Korean Journal of Malacology
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• v.5 no.1
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• pp.29-34
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• 1989

의암호에서 채집된 작은애칭이(Anodonta aracaeformis)와 펄조개(Anodonta woodiana despecta)의 유생을 줄납자루(Acheilognathus yamatautae), 돌고기(Pungtungia heizi), 붕어(Carassius auratus)를 숙주로 하여 인위 감염 시킨 결과는 다음과 같다. 1. 펄조개 glochidium 의 부착기간은 줄납자루, 돌고기에 각각 10일과 9일이었고 작은대칭이glochidium은 붕어에 21일간 부착하였다.2. 펄조개, 작은 대칭이 glochidium은 숙주의 가슴지느러미와 아가미에 높은 부착률을 나타내었다.3. 펄조개glochidium의 부착전과 후의 크기 변화는 없었으나 작은 대칭이 glochidium의 경우는 각고, 각장, 인대길이의 부착전 평균 크기가 0.345mm, 10365mm, 0.271mm에서 21일 이후 이탈 직전의 평균 크기는 0.373mm, 0,386mm, 0.290mm로 외형적인 크기 증가를 나타내었다.4. 펄조개 glochidium감염에 대한 숙주의 민감성은 줄납자루가 돌고기보다 높게 나타났다.5. 펄조개 glochidium은 부착후 2일, 작은대칭이는 8일째부터 기관 형성을 관찰할 수 있었다.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06c
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• pp.11-15
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• 2010

최근 들어 정보기술의 발전으로 인해 타 연구 분야와 정보기술을 접목하여 새로운 연구를 수행하려는 IT 융합 연구의 비중이 커지고 있다. 지구환경 보호를 위해서 국내외 환경 및 생태학 분야에서도 정보기술을 기반으로 한 연구가 많이 수행되고 있다. 하나의 예로 미국 위스콘신대학교를 중심으로 정보기술자와 생태학자가 협력하여 미국, 뉴질랜드, 대만 등의 호수와 하천의 생태학적 관측 자료를 수집하여 웹기반으로 연구자에게 제공하는 GLEON(Global Lake Ecological Observatory Network) 연구 사업이 진행되고 있다. 국내에서도 강원대학교에서 소양호와 의암호 등지에 센서를 설치하여 고해상도 모니터링을 시도한 사례가 있었다. 이에, 본 논문에서는 하천 및 호수에 설치된 센서에서 수집되는 다량의 데이터를 처리하여 환경 및 생태학자들이 활용 가능하도록 한국과학기술정보연구원(KISTI)이 보유한 사이버인프라스트럭처를 기반으로 환경.생태분야 e-Science 게이트웨이를 설계하고자 한다. 이를 위해 1) GLEON 등의 해외 관련 사이트를 조사하였으며, 2) 강원대학교에서 설치하여 운영 중인 소양호, 의암호 등에서 센서 관측 데이터를 수집하고, 3) 수집된 데이터를 처리하기 위한 메타데이터와 데이터베이스 스키마를 설계하고, 4) 환경.생태학자들이 연구에 활용 가능하도록 웹 기반 e-Science 게이트웨이인 KLEON(Korean Lake Ecological Observatory Network)을 설계하였다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.04a
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• pp.112-113
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• 2000

산업이 발달하면서 비(雨)는 곧 산성비호 인식되어졌고, 불과 십수년 만에 산성비는 커다란 환경문제로 부각되었으며 이에 대한 많은 연구가 진행되어 왔다. 하지만 안개에 관한 연구는 안개의 특성상 발생일수 및 발생지역이 제한적이고, 채취가 어려워 국내에서는 연구가 활발하지 못한 실정이다. 이러한 이유로 북한강의 상수원인 의암호.소양호.춘천호에 인접한 춘천은 타 지역에 비해 연중 60 ~ 100일에 이르는 높은 안개 발생일수를 나타내고 있다(김만구 등, 1998).(중략)

• The Korean Journal of Malacology
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• v.12 no.2
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• pp.141-145
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• 1996

1996년 8월 춘천 의암호에서 채집한 긴애기물달팽이(Fossaria truncatula)를 재료로 공기건조법을 이용하여 통상적인 방법으로 염색체를 관찰하고 핵형을 분석하였다. 그 결과 긴애기물달팽이의 염색체 수는 2n=31, 32이었으며 15쌍의 배수체와 1개의 성염색체를 가지고 있었다. 핵형은 3쌍의 metacentric과 13쌍의 submetacentric 염색체로 구성되어 있었다.