• 한국어류학회지
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• 제33권4호
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• pp.287-296
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• 2021

아산호와 충주호에서 2021년 6~9월 사이에 삼각망에서 채집된 어류의 종 조성과 강준치(Erythroculter erythropterus) 개체군의 전장 - 체중 상관관계를 조사하였다. 조사기간 동안 아산호에서는 6과 13종 4,977개체, 충주호에서는 8과 18종 2,436개체가 채집되었다. 아산호의 우점종은 생체량 및 개체수에서 모두 강준치로 각각 498,424 g (84.5%), 4,470 (89.8%)이었으며, 충주호의 우점종 또한 강준치로, 생체량 301,818 g (77.5%), 개체수 1,327 (54.5%)이었다. 우점종인 강준치의 전장분포도 분석을 통해 연령구조를 추정하였으며, 아산호에서는 만 1~2년생의 출현비율이 높아 개체군의 성장 가능성이 크고, 충주호에서는 만 2년생 이상의 고 연령군의 출현이 대부분을 차지하여 비교적 개체군의 성장이 억제될 것으로 사료된다. 강준치 개체군의 전장-체중 상관관계를 분석한 결과, 아산호와 충주호에서의 b 값은 각각 3.06, 3.04, 비만도(K) 기울기 값은 각각 0.000128, 0.000051로 모두 양의 생육상태를 보였다. 조사시기별 비만도 기울기 값은, 6월이 가장 높았고 산란으로 인해 7월에는 낮아졌으며 9월까지도 영양 상태를 회복되지 못하고 음의 기울기가 나타났다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2010년도 학술발표회
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• pp.1026-1030
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• 2010

The Geum river being used as drinking water sources has contaminated due to inflow of inadequately treated wastewater from the tributaries into the river. The characteristics of water quality in the upper regions showed good grade(BOD<3mg/L) in the Geum river, the Mankyung river and the Dongjin river, while that in the lower regions and the upper region of the Sapkyo river did not achieve the good grade. This resulted in the inflow of domestic, industrial and livestock wastewater not adequately treated by wastewater treatment systems. For lakes, the mouth of the kyungchun lake, the Sapkyo lake and the Yedane lake showed the eutrophication phenaminon with higher COD concentration. In particular, total phosphorus and chlorophyll-a concentration were higher in the Sapkyo lake than other lake.

• 한국환경보건학회지
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• 제35권5호
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• pp.376-385
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• 2009

The characteristics of Lake Cheonhoji water and sediment were investigated in oder to utilize these as fundamental materials for the management of lake water quality. The hydrographic properties of Lake Cheonhoji which are relatively low chance of nutrients loading from the watershed and a long retention time of lake water, lead to the probability of high lake productivity. It was also observed that lake water showed stratification during summer and complete mixing during fall, even though water depth was relatively shallow. The trophic state was eutrophic to hypertrophic from summer to late fall. The overall properties of the sediment were oligohumic, high ignition loss and high composition of NAIP and Resid.-P, which might serve as potential pollution sources of lake water quality. In laboratory scale experiments, it was observed that leaching potential of nutrients in the sediment was greatly dependant upon water temperature and dissolved oxygen. Finally, water pollution in Lake Cheonhoji was considered to be largely due to the adverse cycle of uncontrollable eutrophication, which resulted in the subsequent occurrence of dead algae and animal plankton, organic sedimentation, reduction of dissolved oxygen and nutrients leaching, which again reinforced the cycle of eutrophication in the lake.

• 한국관개배수논문집
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• 제3권2호
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• pp.11-19
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• 1996

Lake Soyang, the largest man-made lake in Korea, has been experiencing water quality degradation because of excessive nutrient loads from the watershed. Objective of this paper is to describe land uses in and TP and TN loading characteristics from the lak

• 한국물환경학회지
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• 제35권4호
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• pp.352-361
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• 2019

The purpose of this study is to analyze the characteristics and correlations of the Yeongcheon Lake in order to reduce the occurrence of harmful cyanobacteria. In this study, we investigated the water quality and phytoplankton of the lake from May to November in 2017. Correlation and data mining analyses were performed to analyze the relationship between the two factors. The water temperature was lowest at the point where the Yeongcheon Lake inflow occurs at Imha Lake. It was highest at the point where the outflow occurs to Angye Lake. The pH was also highest at the outflow point, but in the case of DO, it was highest at the midpoint between the inflow and outflow. The main cyanobacteria that emerged during the study period were Oscillatorialimosa, Microcysti saeruginosa and Aphanizomenon flos-aquae. As a result of correlation analysis, the water temperature, inflow, COD loading, TOC loading at the inflow point of the Yeongcheon Lake were the items that were related to the harmful cyanobacteria. The data mining analysis indicated that the TP loading and harmful cyanobacteria in the inflow point of the Yeongcheon Lake were influential on the detrimental cyanobacteria in the Yeongcheon Lake outflow point. When the TP loading was less than 39.0 kg/day at the inflow site, it was expected that the amount of harmful cyanobacteria could be maintained below 10,000 cells/mL.

• 한국환경과학회지
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• 제20권6호
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• pp.711-719
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• 2011

This study was conducted to estimate the distribution characteristics and budget of organic matter in the Lake Hapcheon. In the dry season, the concentration ranges of organic carbons were similar, but in the rainfall season, it showed about double concentrations. Changes of vertical water quality in the lake, there were no big differences with the concentration by the depth. However, it tends to be relatively high on the surface, a little low on the mid-depth and high in the lake bottom. DOC rate at TOC, it was lower than POC rate at inflow and DOC rate was higher than POC rate in the lake and discharging water. R-DOC accounted for more 80% of DOC rate in all investigated areas, therefore we judge that this R-DOC is to increase the organic carbon pollution gradually. As the result of the calculated organic carbon budget in the Lake Hapcheon, the amount of allochthonous, autochthonous and release were 3,552, 3,288, 228 tonC/year, respectively. the amount of discharge, decomposition and sedimentation were 504, 1,344, 5,520 tonC/year, respectively. According to this investigation, the changed amount of organic matter in the Lake Hapcheon recorded -300 tonC/year with the increase of 7,068 tonC/year and the decrease of 7,368 tonC/year.

• 한국환경과학회지
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• 제13권12호
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• pp.1089-1102
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• 2004

Seasonal variation of biogeochemical characteristics was determined in Lake Shihwa from October 2002 to August 2003. When the lake was artificially constructed for the freshwater reservoir in 1988, the development of the strong haline density stratification resulted in two-layered system in water column and hypoxic/anoxic environment prevailed in the bottom layer due to oxidation of accumulated organic matters in the lake. Recently, seawater flux to the lake through the sluice has been increased to improve water quality in the lake since 2000, but seasonal stratification and hypoxic bottom layer of the lake still developed in the summer due to the nature of artificially enclosed lake system. As the lake is still receiving tremendous amount of organic matters and other pollutants from neighboring streams during the rainy summer season, limited seawater flux sluicing into the lake may not be enough for the physical and biogeochemical mass balance especially in the summer. The excess of accumulated organic matters in the bottom layer apparently exhausted dissolved oxygen and affected biogeochemical distributions and processes of organic and inorganic compounds in the stratified two-layered environment in the summer. During the summer, ammonia and dissolved organic carbon remarkably increased in the bottom layer due to the hypoxic/anoxic condition in the bottom layer. Phosphate also increased as the result of benthic flux from the bottom sediment. Meanwhile, dissolved organic carbon showed the highest value at the upstream area and decreased along the salinity gradient in the lake. In addition to the sources from the upstream, autochthonous origin of particulate organic carbon from algal bloom in the lake might be more important for sustaining aggravated water quality and development of deteriorated bottom environment in the summer. The removal of trace metals could be attributed to scavenging by strong insoluble metal-sulfide compounds in the hypoxic/anoxic bottom layer in the summer.

• 한국농공학회지
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• 제44권6호
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• pp.124-136
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• 2002

A freshwater lake water quality management system(FLAQUM) was developed to help regional manager for the water quality of a rural basin. The integrated user interface system FLAQUM written in Visual Basic, includes three subsystems such as a database management system, basin pollutant loads simulation model using SWMM model and freshwater lake water quality simulation model using WASP5 model. Pollutant load simulation model was applied to simulate the discharge and pollutant loading from the watershed, and freshwater lake water quality model was applied to analyze the changes in water quality with respect to watershed pollutant loads, and this model could be used in planning to control watershed pollutant source for water quality management. Database management system was constructed fur all input and output data processing, and it can be used to analyze statistical characteristics using constructed data. Results are displayed both graph and text for convenience of user. The results of FLAQUM application to Boryeong freshwater lake showed that the lake was in eutrophic condition. The major contribution of pollution comes from tributary No.1 and No.4, which have a large number of livestock farms. Therefore, water quality management must be focused on appropriate management of the livestock farming in the two breanchs.

• Environmental Engineering Research
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• 제11권4호
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• pp.181-193
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• 2006

The hydrophilic or hydrophobic characteristics of dissolved organic matter (DOM) from different origins in lake and river waters were investigated using spectrometric and chromatographic analyses of water samples. DOM in a deep, mesotrophic lake (Lake Unmun) was fractionated using three types of ion exchange resins and classified into aquatic humic substances (AHS), hydrophobic neutrals (HoN), hydrophilic acids (HiA), hydrophilic neutrals (HiN), and bases (BaS). The DOM fractionation provided insight into the understanding of the nature of heterogeneous DOM molecules present in different water sources. The UV/DOC ratios were determined for samples from the influent river and lake waters during DOM fractionation and incubation. AHS prevailed over DOM in the lake and river waters. After biodegradation, the relative contribution of AHS in the total DOM became more significant. It indicates that the AHS fraction would increase while water stay long time in the lake.

• 생태와환경
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• 제34권1호통권93호
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• pp.62-69
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• 2001

본 연구는 삽교호 유입지천(곡교천, 무한천, 삽교천, 남원천)에서 강우시 유량 및 수질 관측을 1999년 6월부터 11월까지 실시하여 분석한 것이다. 연구의 최종 목적은 삽교호 수질을 개선시키는 것이며, 그 일환으로 삽교호 유입지천의 오염부하를 저감시키기 위해 강우시 유입되는 비점오염물질의 유출 특성 및 오염부하량을 산정하는데 본 연구의 목적이 있다. 조사 결과, 평상시 삽교호 수량에 가장 많은 영향을 미치는 유입지천은 삽교천이며, 강우시에는 유역면적이 가장 넓은 곡교천이 삽교호 수량에 가장 큰 영향을 미쳤다. 유역의 토지이용형태에 따른 유출 특성에 현격한 차이를 보여 수질 관리를 위한 대책 수립시 고려되어야 할 인자로 도출되었다. 삽교호로 유입되는 연간 총오염부하량 중 강우시 발생되는 비점오염부하량의 기여율은 SS, BOD, T-N 및 T-P 각각 62%, 43%, 41% 및 27%으로 추정되어 삽교호 수질을 개선하는데 유입부하를 감소시키기 위한 관리기법을 도입할 때 점오염원과 비점오염원에 대한 부하량 저감대책을 함께 수립해야 할 것으로 판단된다.