• Journal of Life Science
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• v.16 no.1
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• pp.148-155
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• 2006

The diversity of bacterial populations in rivers flowing through Changwon City, was investigated using quinone profiling. The physicochemical properties such as temperature, pH, dissolved oxygen(DO), dissolved organic carbon (DOC) and biochemical oxygen demand (BOD) were also measured in this study. Ubiquinone (UQ)-8, UQ-9 and UQ-10 were observed in all samples for the sites investigated. UQ-8 was the -predominant quinone species in rivers except for Namch'on downstream, T'owolch'on, and Kaumchongch'on in autumn, while UQ-8 was also found as major quinones in the sample except for Hanamch'on, T'owolch'on, Kaumchongch'on, and Namsanch'on in winter. A higher concentration of DOC in rivers yield high concentration of plastoquinone (PQ-9) in autumn and those of total quinones in winter, respectively. Correlation analysis also indicate that BOD is considered to be a major factor controlling the concentration of PQ in rivers.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.525-525
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• 2023

영산강·섬진강수계는 광역상수원의 수질개선을 위해 제도적인 노력과 예산을 투입하고 있다. 제도 도입 시행 후 20여년이 경과하면서 수변구역 내 오염원 제거가 이루어졌음에도 불구하고 주암호와 동복호의 수질은 크게 개선되지 않고 있다. 따라서, 효율적인 수질개선을 위해서는 섬진강수계 토지매수 대상 지류지천의 과학적 방법을 통한 오염 인자 조사 및 분석, 실측 자료에 기반한 우선순위 산정이 필요하다. 본 연구에서는 수질 전문가 50명을 대상으로 설문조사를 실시하고AHP 기법을 통해 주암호 19개, 동복호 9개, 상사호 9개, 수어호 3개, 탐진호 16개 하천의 우선순위를 분석하였으며, 각 지류지천별 오염원 인자(생활계, 축산계, 산업계, 토지계)와 실측 인자(T-P 농도, T-P 단위면적당 오염부하량)를 이용해 하천별 배점을 산정하였다. 그 결과, 1위부터 10위 우선순위 하천의 경우 배점 합계 점수가 최소 65.9점부터 최대 82.0점까지의 점수 범위를 보였으며, 주로 배점 가중치가 가장 높은 T-P 농도와 T-P 단위면적당 오염부하량이 높은 값을 보였다. 총 배점 대비 인자별 구성 비율을 계산해본 결과, 실측 인자 중 관측 T-P 농도는 평균 33.9%, T-P 단위면적당 오염부하량은 평균 32.7%로 총합 66.6%의 값을 보였다. 또한, 높은 배점값을 보인 지류지천은 오염원 인자에서도 높은 값을 보여 토지매수로 인한 수질개선 효과가 높아질 것으로 판단된다.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2005.04a
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• pp.402-404
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• 2005

2004년 7월부터 2005년 2월까지 8개월 동안 강원도 정선지역 탄산염지대 지하수 및 하천수의 ${\delta}^{13}C$의 조사 결과, 탄산염 지대 지하수의 13C는 $-12.07{\sim}-8.63$ (평균 -10.34 ), 탄사염지대 하천수의 ${\delta}^{13}C$는 $-10.32{\sim}-6.80$ (평균 -7.944 ) 이었다. 하천수와 지하수 ${\delta}^{13}C$는 수온(T)과 음의 상관관계를 보이고 물의 전기전도도(EC)와 양의 상관관계를 보이며, 여름보다 겨울에 높은 값을 보이는 반면 산화환원 전위(Eh), 용존산소(DO), pH와는 상관관계가 미약함을 보이고 있다. 탄산염지대 지하수 및 하천수의 ${\delta}^{13}C$는 연구지역의 지하수와 하천수가 탄산염암의 용해, 대기 $CO_2$와 용존 $CO_2$의 교환, 유입된 대기 $CO_2$가 물 분자와 반응하여 ${HCO_3}^-$ 이온으로 전환될 때 있는 분별작용의 효과에 의해 주로 영향을 받았으며 수중생물의 신진대사에 의한 변화는 미미한 것으로 나타났다.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.189-189
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• 2023

최근 이상 기후변화로 인해 환경과 생태계 등 다양한 분야에서 문제들이 발생하고 있다. 특히 하천에서는 유량 부족, 부영양화, 탁수 등 수질 악화 현상이 대두되고 있어 체계적인 하천 수질관리의 필요성이 높아지고 있다. 국내에서는 수질오염총량제도를 통해 BOD, T-P 항목을 대상물질로 수계의 수질을 관리하고 있지만, 오염원이 다양해짐에 따라 다항목의 수질인자를 활용한 평가방안이 필요한 실정이다. 최근 효율적인 하천의 수질관리를 위해 다양한 항목을 고려한 종합적인 수질 평가 방법이 도입되고 있다. 국내외에서는 하천의 종합적인 수질을 평가하고자 CCME WQI, RTWQI, NSFWQI 등의 수질지수(Water Quality Index, WQI)를 개발하여 하천의 복잡한 수질 정보를 점수 및 등급으로 산정하여 하천의 수질을 평가하고 있으나 하천 유역 특성에 따라 주요 영향 인자가 상이하므로 유역 특성에 따른 맞춤형 수질관리가 필요하다. 본 연구에서는 유역 특성별 수질을 평가하기 위해 의사결정나무 기법을 적용한 수질지수를 산정하고자 한다. 군집분석을 통해 비슷한 특징을 가지는 유역을 분류하고, 군집별 특성 및 관계 분석을 통해 유역별 주요 수질인자 도출 및 가중치를 산정하여 군집별 적합한 수질지수를 산정하고자 한다. 이러한 연구를 통해 유역 특성별 수질 관리를 위한 기초 자료로 활용될 수 있을 것으로 사료된다.

• Journal of Korea Water Resources Association
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• v.36 no.6
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• pp.1013-1023
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• 2003

This study was performed to improve water quality of stream by applying hydraulic structures (weir and river bed material) made of porous concrete. The physical and chemical characteristics of porous concrete were measured to estimate application possibility of it in hydraulic structures and it was considered as a proper material for the hydraulic structures. In the results of comparison for the component of matters attached on the hydraulic structures made of porous and ordinary concrete, DW (dry weight) amount attached on porous concrete was 1.6 times higher than that on ordinary concrete under the condition of the same flow rate but influence by flow rate (difference of 10 times) was not shown. Therefore, we could understand that the material of media was more important in DW amount than flow rate. The rate of AFDM (ash free dry mass) to DW also was more at porous concrete than at ordinary concrete. Especially, the high rates of nitrogen and phosphorous in matters attached on porous concrete verify that they were removed by assimilation, adsorption and metabolism of periphyton. The removal percentage of SS, BOD, COD, T-N and T-P by hydraulic structures applying porous concrete compared with ordinary concrete was increased by 34.6%, 36.9%, 33.9%, 18.3% and 21.6%, respectively. Therefore, applying porous concrete to hydraulic structure is expected to contribute to improvement of stream water quality.

• Korean Journal of Environmental Agriculture
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• v.25 no.1
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• pp.34-39
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• 2006

The land use pattern, water quality and vegetation were investigated in the six tributaries, including Hanggeumcheon and Satancheon of the Namhan hydrosphere, Iksancheon, Jeonjucheon and Gosancheon of the Mankyung hydrosphere as well as Jongeupcheon of the Dongjin hydrosphere. Forest and farmland area were extensive in Hanggeumcheon, Satancheon and Gosancheon. Farmland and livestock area were wide in Iksancheon. Jeonjucheon were occupied with broad urban. Industrial and urban area were extensive in Jongeupcheon. The loading amounts of biochemical oxygen demand (BOD), total nitrogen (T-N), total phosphorus (T-P) of Iksancheon and chemical oxygen demand (COD) of Jeonjucheon were determined to be very high, respectively. The quality of water in Hanggeumcheon, Satancheon and Gosancheon were determined to be good quality. The species diversity was lower in the down stream than in the upper stream except for the Gosancheon. Life form of plane were mostly perennial plane in the upper stream and annual plants in the down stream of rivers. It was estimated that there is high level of disturbance in the down stream of rivers. The quality of water was significantly correlated with farmland and forest area. In conclusion, human impact, such as farmland and housing lot exerted an influence on the disturbance of down stream and the water quality of rivers.

• Journal of Korean Society of Environmental Engineers
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• v.31 no.11
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• pp.975-982
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• 2009

The purpose of this study is to offer informations about the current conditions and basic data of stream sediments in Busan city. So we first select 14 urban streams and collect sediment samples. Then, COD, proximate analysis, volatile solid, organic carbon content and elemental analysis were conducted to determine characteristics of the sediments. Results show that COD, volatile solid, Organic carbon content, T-N of sediment are determined in the range of 1.20~75.07 mg/g, 0.19~11.54%, 0.23~34.21% and 0.76~3.46%, respectively. Analysis data of sediments were compared with USEPA sediment quality standards and ontario sediment quality guidelines. As a result, when compared with COD, volatile solid and organic carbon content values, Bosucheon and Gudeokcheon are relatively heavily contaminated than the remainder sampling sites. But when compared with T-N values, all of sites were evaluated as seriously contaminated. Finally, for the determination of the correlations between sediment COD and moisture contents, ash contents, volatile solid, total organic carbon, total nitrogen and total carbon, linear model was fitted to the data using a least-squares algorithm. As a result, Linear model was well fitted to each data with good values of the correlation coefficient (r=0.9664~0.8501).

• Journal of Korean Society of Environmental Engineers
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• v.36 no.1
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• pp.58-66
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• 2014

Water pollution problems of urban rivers due to the urbanization and industrialization have been the subject of public attention. In particular, considering the fact that the characteristics of water cycle of each basin change dramatically through the development of new towns, a large number of concerns about future water quality have been raised. However, reasonable measures to predict future water quality quantitatively have not been presented by this moment. In this study, by the linkage of annual unit load generation based on long-term monitoring results of the ministry of environment (MOE) to a semi-distributed rainfall runoff model, SWMM (Storm Water Management Model), we proposed a new methodology to estimate future water quality macroscopically and testified it to verify its applicability for the estimation of future water quality of a small watershed at G new town. As a result of the estimation using Y-EMC (Yearly based Event Mean Concentration), future water quality were simulated as BOD 18.7, T-N 16.1 and T-P 0.85 mg/L respectively which could not achieve the grade III of domestic river life guidance and these criteria could be satisfied by the reduction of domestic wastewater discharge load by over 80%. The results of this study are shown to be utilized for one of basic tools to estimate and manage water quality of urban rivers in the course of new town developments.

• Journal of Korea Water Resources Association
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• v.52 no.spc2
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• pp.777-789
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• 2019

The purpose of this study is to evaluate changes in water quality and aquatic ecosystem health by additional dam release of stream maintenance flow from multipurpose dams in Han river basin ($34,148km^2$) using SWAT (Soil and Water Assessment Tool). The period of additional release was spring (April to June) and autumn (August to October) to evaluate the changes with the data of aquatic ecosystem health survey. The amount of additional release was set proportional to the present dam release, and the maximum release amount was controlled not to exceed the officially notified stream maintenance flow from dam. The 10 percent to 50 percent additional releases showed that the stream water quality (T-N, $NH_4$, T-P, and $PO_4-P$) concentrations except $NO_3-N$ decreased in spring while increased in autumn period. Using the stream water quality results and applying with Random Forest algorithm, the grade of aquatic ecosystem health index (FAI, TDI, and BMI) was improved for both periods especially in the downstream of basin. This study showed that the additional release of stream maintenance flow was more effective in spring than autumn period for the improvement of water quality and aquatic ecosystem.

• Journal of Wetlands Research
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• v.15 no.3
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• pp.301-315
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• 2013

The purpose of this study is to investigate characteristics of hydromorpological structures that affect landscape preference and visual characteristics on the sections of the designated streams where have dynamic ecological characteristics. We evaluated the ecological status of the streams utilizing LAWA to assess hydromorpological structures of streams. We also investigated preference and visual characteristics of stream landscapes through Semantic Differential Scale(SD scale). The differences of visual images according to the characteristics of hydromorpological structures in the sites were analyzed by descriptive statistics, One-way ANOVA, and t-test. As a result, this study showed that sections represented as "good" ecological status are shown to be harmonious, beautiful, natural, and clean comparing to sections represented as "poor" ecological status. The hydromorpological structures that have significant impacts on the visual characteristics are considered as riparian vegetation, cross-sectional shape, and the artificial structures. Results of this study can help guide the stream restoration of the damaged stream to improving ecological function and positive landscape.