• 한국수자원학회논문집
• /
• 제49권4호
• /
• pp.347-359
• /
• 2016

본 연구에서는 기후변화에 의한 유량의 변화에 따른 시나리오를 구성하고 장기간, 장구간에 걸친 하상변동 양상을 예측하였다. 준2차원 수치모형인 GSTARS를 이용하여 남한강의 하상변동 모의에 적합한 민감도 분석을 수행하였다. 홍수위에 대한 하상변동 모의결과와 실측치에 대한 결정계수, 평균제곱근 오차, 모형효율성계수를 비교한 결과, 모의에 적합한 결과를 나타내어 GSTARS 모형의 적용성을 확인하였다. 수류튜브를 활용하여 개수에 따른 영향을 분석한 결과, 수류튜브 3개일 때 하상변동이 적절하게 나타났으며 너무 많은 수류튜브는 깊이만 깊어지는 결과를 나타냈다. 유사량 공식으로는 Ackers and White공식, Yang 공식이 적용성이 좋았다. 유량의 변화에 관계없이 하도가 좁아지는 방향으로 변화할 것이며 기후변화로 인해 유량이 늘어날수록 하도가 깊어질 것으로 예상된다.

• 한국물환경학회지
• /
• 제26권6호
• /
• pp.1016-1027
• /
• 2010

The phosphorus contribution rate on water quality of North and South-Han River, and Gyungan-cheon by effluents from environmental fundamental facilities located in upstream basin of Paldang Lake were analyzed. QUALKO2 model was selected for the analysis of contrubution rate, and was constructed considering the location of the main point sources and all facilities in study area. The pollutant loading rates and arrival rates for each unit-watershed in study area were calculated for model operation. For the calibration and verification of model, 2006 water quality dataset from Ministry of Environment and the effluent loadings of the environmental fundamental facilities were used. Reliability Index (RI) method was used to estimate the validity of the results of calibration and verification. The phosphorous contribution rate(%) for each environmental fundamental facility were analyzed by excepting the effluent loading of the facility. The contribution rate was analyzed for each facility, facility groups separated by each main river and each unit-watershed. The main results of analysis for each facility are as follows; (i) the phosphorous contribution of B1 facility is 50%, which is the highest phosphorous contribution rate among those of nine facilities in the North-Han River Basin; (ii) the highest phosphorous contribution is 55.6% from J facility among eight facilities in the Gyungan Stream Basin; (iii) 40% from E treatment facility is the highest among those of twenty eight facilities in the South-Han River Basin.

• 한국환경과학회지
• /
• 제26권8호
• /
• pp.913-925
• /
• 2017

Phytoplankton populations were examined at three sites in Lake Cheongpyeong, South Korea from March 2008 to December 2016, including measurement of phytoplankton communities and their dominant species, abundance and environmental factors. The annual average ranges of water temperature, dissolved oxygen and conductivity were $15.2-18.8^{\circ}C$, 10.3-12.2 mg/L, $86-140{\mu}S/cm$, respectively, with similar values at all studied sites. The highest phytoplankton cell density was observed in spring and fall, and it subsequently decreased rapidly during heavy rainfall. Diatoms were dominant in spring (mainly Stephanodiscus hantzschii, Asterionella formosa) and fall (mainly Aulacoseira granulata), while greenalgae and cyanobacteria had high appearance in early-summer and summer, respectively, indicating that water temperature is the most important factor influencing their growth. Stephanodiscus hantzschii and Asterionella formosa frequently occurred at low water temperature ($4.5-15.0^{\circ}C$ and $5.4-21.6^{\circ}C$, respectively) while Aulacoseira granulata and Anabaena spp. were favored by high water temperature (8.6-28.4 and $14.9-26.2^{\circ}C$, respectively) and phosphorus. Additionally, Fragilaria crotonensis occurred at low nutrient conditions. Rhodomonas spp. frequently appeared year-round.

• 한국미생물·생명공학회지
• /
• 제51권2호
• /
• pp.214-216
• /
• 2023

메로페넴에 내성을 갖는 Pseudomonas peli CJ30 균주가 대한민국의 한강에서 분리되었다. CJ30 균주의 유전체는 크기가 4,919,106 bp이고 G + C 함량이 60.0%인 아홉 개의 contig로 조립되었다. CJ30 균주의 유전체 서열은 5,411개의 단백질 코딩 유전자, 18개의 rRNA 유전자 및 70개의 tRNA 유전자를 포함하였다. 균주 CJ30에는 bla_SFC-3 및 ampC β-락타마아제 유전자가 포함되어 있습니다.

• 한국해양학회지:바다
• /
• 제8권3호
• /
• pp.225-236
• /
• 2003

한강 유역에서 하천과 하구-만의 퇴적환경의 연계성과 한강본류의 퇴적환경의 변화를 연구하기 위해, 230여 점의 표층퇴적물과 70여 점의 부유퇴적물과 수리학적 자료를 분석하였다. 연구지역은 신곡수중보를 기준으로 두 가지 환경(하천, 하구-만)으로 구분할 수 있다. 남한강과 북한강에는 역질 퇴적상이, 한강 본류는 사질과 실트질 퇴적상이 우세하게 븐포하였다. 한강 본류 지역은 신곡수중보에 의한 제한적인 퇴적물 이동과 에너지 환경에 의해 퇴적환경의 변화가 발생하였다. 하구-만 환경에 있어서, 수로와 외해 지역에는 상대적으로 조립한 퇴적물이 우세한 반면에, 연안지역은 세립하고 분급도가 불량한 퇴적물이 우세하게 분포하였다. 하천과 하구-만의 연계성은 인공 구조물에 의한 흐름의 제한에 의해서 영향받기 때문에, 평수기에 각 하천은 개별적인 퇴적환경을 나타내며, 하천과 하구-만의 연계적인 퇴적환경은 조석에 영향을 받고, 하구-만의 전이적인 지역은 하천 방향으로 이동한다. 그러나, 풍수기에 각 하천은 하천 유량의 증가에 의해, 연계적인 퇴적환경을 나타내며, 하천-하구-만의 각각의 전이지역은 외해방향으로 이동함을 시사한다. 보다 자세한 연구를 위해서는 신곡수중보 하류의 하구지역에 대하여 남북한 공동연구가 필요하다.

• 한국물환경학회지
• /
• 제28권6호
• /
• pp.866-881
• /
• 2012

Han River is a complex water system consisting of many lakes. The water quality of Lake Paldang is significantly affected by incoming flows, which are the South and North branches of the Han River, and the Kyungan Stream. In order to manage the water quality of the Lake Paldang, we should consider the entire water body where the incoming flows are included. The objectives of this study are to develop an integrated river and lake modeling system for Han River system using a multidimensional dynamic model and evaluate the model's performance against field measurement data. The integrated model was calibrated and verified using field measurement data obtained in 2007 and 2008. The model showed satisfactory performance in predicting temporal variations of water level, flow rate and temperature. The Root Mean Square Error (RMSE) for water temperature simulation were $0.88{\sim}2.13^{\circ}C$ (calibration period) and $1.05{\sim}2.00^{\circ}C$ (verification period) respectively. And Nash-Sutcliffe Efficiency (NSE) for water temperature simulation were 1089~0.98 (calibration period) and 0.90~0.98 (verification period). Utilizing the validated model, we analyzed the spatial and temporal distributions of temperature within Han River system. The variations of temperature along the river reaches and vertical thermal profiles for each lakes were effectively simulated with developed model. The suggested modeling system can be effectively used for integrated water quality management of water system consisting of many rivers and lakes.

• 한국수자원학회논문집
• /
• 제41권4호
• /
• pp.353-363
• /
• 2008

이 연구는 남북 공유하천의 바람직한 관리 비전과 목표를 수립하기 위해서 북한강의 임남댐 사례를 통해 합리적인 관리 전략을 세우는 것을 목적으로 한다. 방법론적으로는, 게임이론의 접근 방법을 통해 남북한 공유하천 문제의 해법을 찾아보았다. 기존의 논의가 주로 남북 간의 비협조적인 상황 하에서의 대응전략을 주요한 관심으로 한 데 비해 본 연구에서는 보상을 연계시킨 협조게임의 접근방법으로 남북 간의 협력의 가능성을 시나리오를 설정하여 분석하였다. 또 남북이 최선의 이득을 얻을 수 있는 협력과 보상의 조건을 계량화하여 평가할 수 있는 방법론을 제시하였다. 남북한이 모두 최선의 편익을 누리는 방법은 북한이 남한에게 유량을 할당해주고, 남한은 그에 대한 보상으로 남북 공동의 이익을 가져다 줄 수 있는 공동개발 사업(임진강 유역의 공동개발 등)에 적극적인 투자를 하는 방법이라고 할 수 있다.

• 산업기술연구
• /
• 제30권B호
• /
• pp.125-135
• /
• 2010

The influences on water quality of each river by effluents from environmental facilities $located^{*}$ in 14 unit watersheds of North- and South-Han River, and Gyungan-cheon were analyzed. Also, the water quality modeling for study area was carried out to analyze the improvement effect of water quality by the strengthening of T-P effluent standard of environmental facilities. For the calibration and verification of model, water quality data and effluent loading calculated for 2006 were used. Data of low water period were used for calibration, and normal water period for verification. The results of calibration and verification were well matched with the real water quality dataset of revers. Also, the validity of the results were estimated using RI (Reliability Index) method. When the T-P effluent standards for environmental facilities were strengthened, T-P concentrations were predicted to improve from $0.025mg/{\ell}$ to $0.023mg/{\ell}$ in the outlet location of North-Han River, from $0.056mg/{\ell}$ to $0.040mg/{\ell}$ for South-Han River,and from $0.233mg/{\ell}$ to $0.146mg/{\ell}$ for Gyungan-cheon. Also, the T-P concentrations of tributaries including Jojong-cheon, Dal-cheong, Sumgang, Chungmi-cheon, Bokha-cheon, Heuk-cheon, and Wonju-cheon were predicted to improve from $0.063mg/{\ell}$ to $0.010mg/{\ell}$, from $0.091mg/{\ell}$ to $0.053mg/{\ell}$, from $0.199mg/{\ell}$ to $0.100mg/{\ell}$, from $0.168mg/{\ell}$ to $0.148mg/{\ell}$, from $0.186mg/{\ell}$ to $0.105mg/{\ell}$, from $0.019mg/{\ell}$ to $0.013mg/{\ell}$, and from $0.822mg/{\ell}$ to $0.236mg/{\ell}$, respectively.

• Journal of Ecology and Environment
• /
• 제43권1호
• /
• pp.31-42
• /
• 2019

Background: Han River estuary is a national wetland reserve near the Demilitarized Zone (DMZ) between South Korea and North Korea. This trans-boundary estuary area has been well preserved and shows distinctive plant communities along the salinity gradient. To elucidate energy flows and nutrient cycling in this area, we studied trophic relations between the dominant sesarmid crab, Sesarma dehaani, and food sources in three wetlands with different environments along the estuarine gradients. Results: Stable isotope signatures (${\delta}^{13}C$ and ${\delta}^{15}N$) of the crabs were significantly different among the sites and body size classes. Seasonal changes in ${\delta}^{13}C$ of small crabs were distinct from those of large individuals at all the sites. The isotopic values and fatty acid profiles of the crabs were more different among the sites in September than in May. In May, large-sized crabs utilized more plant materials compared to other dietary sources in contrast to small-sized crabs as revealed by a stable isotope mixing modeling, whereas contributions to diets of crabs were not dominated by a specific diet for different body size in September except at site 1. Based on PCA loadings, fatty acid content of $18:3{\omega}3$, known as a biomarker of plant materials, was the main factor to separate size groups of crabs in May and September. The ${\delta}^{13}C$ value of sediment had high correlation with those of small-sized crabs at site 1 and 2 when 1-month time lag was applied to the value for crabs during the surveyed period. Conclusions: Based on the stable isotope and fatty acid results, the consumption habits of S. dehaani appear to be distinguished by sites and their size. In particular, smaller size of S. dehaani appears to be more dependent on fewer food sources and is influenced more by the diet sources from the sediments in Han River estuary.

• Journal of Microbiology and Biotechnology
• /
• 제27권4호
• /
• pp.725-730
• /
• 2017

A heteronemertean, Yininemertes pratensis, was collected in Han River Estuary, South Korea. This estuarine nemertean has been known by the local fishermen for harmful effects to the glass eels, juveniles of Japanese eel Anguilla japonica, migrating to fresh water. The present study confirmed the neurotoxic effects of this heteronemertean ribbon worm at the cellular level. Derivative types of neurotoxic tetrodotoxin (TTX), 5,11-dideoxy TTX (m/z 288) and 11-norTTX-6(S)-01 (m/z 305.97), were identified through HPLC and MALDI-TOF MS. However, significant neurotoxicity was confirmed in the fraction containing an undefined molecule corresponding to the 291.1 (m/z) peak, when tested in rat primary astrocytes and dorsal ganglion cells. This study is the first to report neurotoxins of the estuarine nemertean, fairly abundant in the Han River estuary, and suggests the long-term monitoring of population dynamics and surveillance of the toxicity in this river estuary.