• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2023년도 학술발표회
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• pp.27-27
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• 2023

To analyze the evolution of water resources in Qiandao Lake Basin under the condition of climate change, a WEP-L distributed hydrological model was established to simulate the water cycle process in the basin during 1960-2020. The Mann-Kendall non-parametric test method and Hurst index method were used to analyze the inter-annual variation and annual distribution characteristics of the total water resources in the basin. The multi-scale temporal and spatial distribution and evolution trend of water resources in Qiandao Lake Basin were evaluated. The results show that: (1) The WEP-L model has good simulation results in the Qiandao Lake basin, and the Nash coefficient rate is above 0.83 in the periodic period and above 0.85 in the verification period. (2) The water yield coefficient of the whole basin ranges from 0.436 to 0.630. The annual average total water resource is 12.25 billion m³, equivalent to 1176.4mm of water depth. The annual distribution process shows a unimodal structure, and the water depth of each sub-basin ranges from 742 mm to 1266 mm, and the spatial distribution is higher in the west and lower in the east. (3) The annual water resources series in the basin showed an insignificant upward trend, and the Hurst index was 0.86, indicating a continuous upward trend. From the perspective of monthly water resources, January and February increased significantly, the other months were not significant changes.

• Fisheries and Aquatic Sciences
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• 제27권1호
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• pp.23-34
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• 2024

While scientific information on the spatial variation of soda lake Microalgae is important to limnological studies, little information was reported from the Ethiopian Rift Valley Lake, Lake Chitu. This study aimed to understand the spatial distribution of the dominant Microalgae taxa in Lake Chitu, Ethiopia. The collection of samples and in situ measurements of some physico-chemical parameters were recorded at three sites for one cycle in November 2021. Fourteen species or genera of Microalgae were identified. Among those, Bacillariophyta were the most important with regard to species abundance and the rarest in species richness. Cyanophyta were the second-most important group in terms of species richness and rarity. Comparatively, all microalgae taxa were rare at both the anthropogenic areas (AA) and the flooding area (FA), which could be mainly due to intensive human and animal intervention and associated with extreme turbidity. Among Cyanophyta, Chroococcus minutus, Microcystis aeruginosa, and Spirulina platensis/fusiformis were predominant at both AA and FA, revealing their adaptation to less clear water and pollution. But S. platensis/fusiformis attained the highest abundance at the FA, indicating their preference for water in a highly nutrient-enriched area. We concluded that the spatial variation of microalgae diversity in relation to water quality parameters has implications for the importance of microalgae as a baseline indicator of water quality assessment tools in lakes.

• 한국환경생태학회지
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• 제26권1호
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• pp.46-56
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• 2012

본 연구는 2010년 3월부터 10월까지 강원도 횡성군 청일면에서 갑천군 수백리 일대의 횡성호와 횡성호 상 하류지역을 선정하여 저서성 대형무척추동물의 군집구조, 섭식기능군 및 서식기능군 분포, 생물학적 수질을 평가하였다. 조사지역은 횡성호 상류 2개지점(St. 1~2), 횡성호 2개지점(St. 3~4), 횡성호 하류 2개지점(St. 5~6)의 총 6개 조사지점을 선정하여 총 3회에 걸쳐 계류형 정량채집망(Surber sampler $30cm{\times}30cm$, 망목 0.2mm)을 사용하여 정량채집 하였고, 조사지점별 정확한 저서성 대형무척추동물상을 파악하기 위하여 각 조사지점에서 미소서식처에 따른 정성채집을 병행하였다. 조사결과 총 5문 8강 17목 43과 83종이 출현하였으며, 하천의 주요 분류군인 하루살이-강도래-날도래군(EPT-group)이 50종(60.24%)을 차지하였고, 파리목(Diptera)을 더하면 61종(73.49%)으로 전체 출현종의 대부분을 차지하였다. 정량분석시 횡성호 상류지역의 저서성 대형무척추동물은 총 4문 4강 11목 28과 54종 2,399개체, 횡성호에서 총 3문 4강 7목 12과 16종 510개체, 횡성호 하류지역에서 총 4문 6강 13목 33과 62종 626개체가 출현하였다. 군집분석 결과 우점도지수는 0.82~0.93($0.87{\pm}0.05$)으로 횡성호에서 높게 분석되었고, 다양도지수는 3.04~3.16($3.10{\pm}0.06$), 균등도지수는 0.79~0.85($0.82{\pm}0.03$), 풍부도지수는 7.27~8.52($7.90{\pm}0.63$)로 횡성호 하류지역에서 상대적으로 높게 분석되었다. 섭식기능군은 collector-gatherers와 collector-filterers가 높았으며, 횡성호에서는 predators가 상대적으로 풍부하였다. 서식기능군은 swimmers, burrowers, clingers가 대부분을 차지하였다. DCA 서열법과 유사도 분석 결과 횡성호와 횡성호 상 하류지역의 두 개의 그룹으로 명확하게 구분되었으며, 조사지역별 종조성을 MRPP로 분석한 결과, 횡성호와 횡성호 상 하류지역은 유의한 차이를 나타내었다. 생물학적 수질평가를 나타내는 ESB 지수는 횡성호에서 매우불량한 최우선개선수역으로 평가되었다. 조사지역별 지표종은 횡성호 상류지역에서 두점 하루살이, 부채하루살이, 꼬마줄날도래 등 3종, 횡성호에서 징거미새우, 꼬마물벌레 등 2종, 횡성호 하류지역에서 곳체 다슬기, 강하루살이, 긴다리여울벌레류 등 3종이 유의한 지표종으로 분석되었다.

• 상하수도학회지
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• 제8권1호
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• pp.9-17
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• 1994

The study of lake pollution problems is often related to the dynamic behavior of phosphorus. Several phosphorus models are available that may be suitable to study these problems. Depending on the the management objectives and data availability, some models may be more appropriate than others. Criteria are defined to help modelers choose the most appropriate total phosphorus models for different lakes. These criteria consider in-lake processes such as sediment feedback, stratification, and algal uptake and recycle.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
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• pp.727-733
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• 1999

In general ,wastes of livestock are covered 1% in the total wastes in Korea. But, actual pollutant loading rates by an organic material are 18% which will be serious problem in fresh water lake. An aim of this study is analyzing water quality in Bo-Ryeoung fresh water lake which are arounded by a lot of small livestock area, so that look for how to manage water quality of fresh waterlake.

• 미생물학회지
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• 제27권4호
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• pp.378-384
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• 1989

The numerical taxonomy of heterotrophic bacterial community in Lake Soyang was analysed. 95, 115, 88 and 75 strains which were isolated at each season from spring in 1987 to winter in 1988 were clustered by single matching coefficient. The diversity indices (H') were in the range of 0.511-1.684, and the community was most diverse in spring. THe seasonal variation of generic composition was significant. Of the domonant genera, Acinetobacter, Pseudomonas, and Flavobacterium were representative.

• 산업기술연구
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• 제25권B호
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• pp.11-18
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• 2005

When it is raining or snowing, floating debris flows into a lake and raises its turbidity. High level of turbidity in the lake often causes eutrophication, which pollutes the water. In order to collect and present some essential information for effective management plan for water quality, we carried out our research at the watershed of Mandae-cheon located at the upstream of Soyang Lake. We examined water quality at the time of rainfall or snowfall to analyze the changes in the amount of suspend soils(SS) in the lake.

• 한국제4기학회지
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• 제18권2호통권23호
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• pp.17-17
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• 2004

The Pleistocene lake level and climate development is described by proxies from sediment, pollen and diatom records in Mongolia and Northwest-China. It could be proved that higher lake levels seem to have existed during the old and mid Pleistocene period interpreted on the base of geomorphological and sedimentological reords. They are dated in a relativ time scale. The lake basins are filled up to 300 m by limnic deposits, which foused on a constant water balance of more than 700.000 years. Late Glacial and Holocene lake level fluctuations and climate changes can be proved by biostratigraphic records pointing to dry and wet phases. Only for the youngest history desiccation of some lakes are related to human impact.

• 환경위생공학
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• 제15권1호
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• pp.1-6
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• 2000

A milky gray scum was observed at some water area of the lake Daecheong in the summer of 1997 and 1998. To identify a causing organism of scum and affecting factors, we observed the scum material by a phase contrast microscope and surveyed the phsico-chemical water quality during the outbreak of scum. The scum was found out to be clogging cysts of amoeboid protozoan, Asterocaelum sp.(Protozoea Sarcodina Aconchulinida), grazer of filamentous cyanobacteria, Anabaena genus. The protozoan scum appeared during Anabaena bloom period, which continued for a while. This protozoan was presumed acting as a regulator of Anabaena bloom in the lake Daecheong during the summer season. Moreover this is the first report on Asterocaelum sp. a grazing filamentous cyanobacteria occurred in Korean freshwater.

• Environmental Engineering Research
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• 제14권1호
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• pp.13-18
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• 2009

In this study, specific pollutant releases during the Asian monsoon season were estimated and the information was applied to the non-point pollutant sources management from two forested watersheds of the Soyang Lake. The two watersheds are part of the 2,703 km2 Soyang Lake watershed in the northern region of the Han River. The outlets of the two watersheds were respectively analyzed for continuous water quality concentration and for discharge during various single rainfall events. Statistical power function methods are utilized to compare stream discharge and pollutant flux release during the study period. Based on the monitoring data during the study period, the specific load flux method using simulated discharge was conducted and validated in the two watersheds. The model predictions corresponded well with the measured and calculated pollutant releases. The modeling approach taken in this study was found to be applicable for the two forested watersheds.