• Title, Summary, Keyword: Yeongsan river

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Water Quality Characteristics Evaluation by Flow Conditions Using Load Duration Curve - in Youngbon A Watershed - (부하지속곡선을 이용한 유량 조건별 수질특성 평가 - 영본A 유역을 대상으로 -)

  • Park, Jinhwan;Kim, Kapsoon;Jung, Jaewoon;Hwang, Kyungsup;Moon, Myungjin;Ham, Sangin;Lim, Byungjin
    • Journal of Environmental Impact Assessment
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    • v.22 no.4
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    • pp.319-327
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    • 2013
  • This study was conducted to identify runoff characteristics of pollutants using flow duration curve(FDC) and load duration curve(LDC) in Youngbon A watershed during 2009~2011. A flow rate and pollutant load in the study watershed were estimated by equation of stage-discharge and discharge-loads rating curve. From these methods, BOD, T-N, and T-P have evaluated whether water quality standards would have attained. Results showed that BOD loads of about 50% plotted above the LDC, while T-N and T-P loads of about 50% plotted below the curve. It means that BOD of about 50% have exceeded the water quality criteria, while T-N and T-P of about 50% have complied with the water quality standards. Meanwhile, BOD, TN and T-P loads plotted above the LDC of low flows, implying that they were more affected by point pollution sources than nonpoint pollution sources in the study watershed.

Estimation of Pollution Loads from the Yeongsan River Basin using a Conceptual Watershed Model (개념적 유역모델을 이용한 영산강 유역 오염부하 유출량의 시공간적 분포평가)

  • Park, Min-Hye;Cho, Hong-Lae;Koo, Bhon-Kyoung
    • Journal of Korean Society on Water Environment
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    • v.30 no.2
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    • pp.184-198
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    • 2014
  • For estimating discharge and pollution loads into the Yeongsan lake, a conceptual watershed model HSPF(Hydrological Simulation Program - Fortran) was applied to the Yeongsan River Basin. Various spatial data set including DEM, watershed boundaries and land uses were used to set up the model for the Yeongsan River Basin that was divided into 45 sub-basins. The model was calibrated and validated for the river discharges, SS, BOD, TN and TP concentrations against the data observed in 2011 at several monitoring stations. The simulation results show good agreement with the observed water flows($R^2$ = 0.46 - 0.97, NSE = 0.70 - 0.96). The simulated concentrations of SS, BOD, TN and TP are also in good agreement with the observed. The total freshwater discharge to the Yeongsan lake is estimated $2,406{\times}10^6m^3/year$ which the Jiseok and Hwangryoung stream contribute as much as 19%, 17% respectively. It is estimated that the total discharges to the Youngsan lake is SS 152,327 ton/year, BOD 15,721 ton/year, TN 10,071 ton/year, TP 563 ton/year. Both water and pollution loads are high in summer, particularly in July, when the monsoon season arrives at the Korean peninsula.

Topography of the Yeongsan River Basin and its Locals' Life (영산강유역의 지형과 주민생활)

  • Beom, Seon-Gyu
    • Journal of the Korean association of regional geographers
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    • v.8 no.4
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    • pp.451-467
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    • 2002
  • The Yeongsan River is one of major rivers in South Korea, and its basin is one of core areas that produce foods for the nation. The Yeongsan River Basin has flood plain and hill areas well developed, and areas surrounding the Yeongsan Lake has a tidal mud-plat widely dispersed. The flood plains are called 'Deul'. In particular, at the upstream of 'Mulmok' with a narrow valley are widely spread flood plain. The flood plains were developed into rice paddies until the end of Joseon Dynasty. Local core cities were created against these agricultural lands. Hills are called 'Deung', 'Kkageum' and 'Yasan' and in particular, are widely distributed in Naju City and Yeongam County. Forest land on hill began to be seriously developed into agricultural land from the 1960s, and this development is being pursued even today. Much fanning are conducted in the form of leased fanning by outside people. Tidal mud-plats were widely distributed along the downstream of the Yeongsan River, Namhae Bay. Tidal mud-plat is called 'BBeolbat' and tidal channel is called 'Gaeong.' After the estuary dyke of the Yeongsan River was built in 1981, the tidal mud-plat was developed into agricultural land in large-scale reclamation projects, and changed into 'Yeongsan Plains,' With the appearance of new plains, locals' life fundamentally changed, turning all villages into pure farm villages.

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A Nonparametric Long-Term Trend Analysis Using Water Quality Monitoring Data in Nam-River (남강 수질측정망 자료를 이용한 비모수적 장기 수질 추세 분석)

  • Jung, Kang-Young;Kim, Myojeong;Song, Kwang Duck;Seo, Kwon Ok;Hong, Seong Jo;Cho, Sohyun;Lee, Yeong Jae;Kim, Kyunghyun
    • Journal of Environmental Science International
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    • v.27 no.11
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    • pp.1029-1048
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    • 2018
  • In this study, seasonal Mann - Kendall test method was applied to 12 stations of the water quality measurement network of Nam-River based on data of BOD, COD, TN and TP for 11 years from January 2005 to December 2015 The changes of water quality at each station were examined through linear trends and the tendency of water quality change during the study period was analyzed by applying the locally weighted scatter plot smoother (LOWESS) method. In addition, spatial trends of the whole Nam-River were examined by items. The flow-adjusted seasonal Kendall test was performed to remove the flow at the water quality measurement station. As a result, BOD, COD concentration showed "no trand" and TN and TP concentration showed "down trand" in regional Kendall test throughout the study period. BOD and TP concentration in "no trand", COD, and TN concentration showed an "up trand" tendency in Nam-River dam. LOWESS analysis showed no significant water quality change in most of the analysis items and stations, but water quality fluctuation characteristics were shown at some stations such as NR1 (Kyungho-River 1), NR2 (Kyungho-River 2), NR3 (Nam-River), NR6 (Nam-River 2A). In addition, the flow-adjusted seasonal Kendall results showed that the BOD concentration was "up trand" due to the flow at the NR3 (Nam-River) station. The COD concentration was "up trand" due to the flow at NR1 (Kyungho-River 1) and NR2 (Kyungho-River 2) located upstream of the Nam-River. The effect of influent flow on water quality varies according to each site and analysis item. Therefore, for the effective water quality management in the Nam-River, it is necessary to take measures to improve the water quality at the point where the water quality is continuously "up trand" during the study period.

Water Quality Characteristics of the Major Tributaries in Yeongsan and Sumjin River Basin using Statistical Analysis (통계분석을 이용한 영산강·섬진강수계 주요 유입지천의 수질 특성)

  • Park, Jinhwan;Jung, Jaewoon;Kim, Daeyoung;Kim, Kapsoon;Han, Sungwook;Kim, Hyunook;Lim, Byungjin
    • Journal of Environmental Impact Assessment
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    • v.22 no.2
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    • pp.171-181
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    • 2013
  • In this study, we report the water quality characteristics of pollutants for 4 major tributaries in the Yeongsan and Sumjin river basins using statistical analysis, such as regression equation and factor analysis. The flow rate and water qualtiy data collected from 4 sampling sites(Hwangryoung A, Jiseok A, Chooryeong A, Osu A) in the Yeonsan and Sumjin river basin during the past 3 years were analyzed for 11 parameters(flow rate, dissolved oxgen, pH, water temperature, electric conductivity, biochemical oxygen demand, chemical oxygen deman, total organic carbon, total nitorgen, total phosphorus, suspended solid). The results showed that the concentrations of BOD, COD, TOC, T-N, T-P in Hwangryoung A(HW) and Jiseok A(JS) of the Yeongsan river basin were decreased as the flow rate was increased. This means that rather than nonpoint soources, point sources affect water quality. In the cases of Chooryeong A(CR) and Osu A(OS) in the Sumjin river basin, howerever, nonpoint sources than point sources are an important factor that affects the water quality. Also, the factor analysis technique was employed to analyze principal component influencing on water quality. The results revealed that the first principal component in HW was correlated with EC, DO, T-N, water temperature. This "nitrogen influx according to seasonal pattern" factor may be interpreted. In JS, the first principal component was correlated with BOD, COD, TOC and is likely to represent "organic matter" processes. In CR and OS, BOD, COD, TOC, SS and T-P were significantly correlated and is considered as representing "Organic matter and adsorption of phosphorus on sediments influx". This study is expected to contribute to the effective pollution control/management of the surfac waters in the study sites.

Application of Regression Analysis Model to TOC Concentration Estimation - Osu Stream Watershed - (회귀분석에 의한 TOC 농도 추정 - 오수천 유역을 대상으로 -)

  • Park, Jinhwan;Moon, Myungjin;Han, Sungwook;Lee, Hyungjin;Jung, Soojung;Hwang, Kyungsup;Kim, Kapsoon
    • Journal of Environmental Impact Assessment
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    • v.23 no.3
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    • pp.187-196
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    • 2014
  • The objective of this study is to evaluate and analyze Osu stream watershed water environment system. The data were collected from January 2009 to December 2011 including water temperature, pH, DO, EC, BOD, COD, TOC, SS, T-N, T-P and discharge. The data were used for principle component analysis and factor analysis. The results are as followes. The primary factors obtained from both the principal component analysis and the factor analysis were BOD, COD, TOC, SS and T-P. Once principal component analysis and factor analysis have been performed with the collected data and then the results will be applied to both simple regression model and multiple regression model. The regression model was developed into case 1 using concentrations of water quality parameters and case 2 using delivery loads. The value of the coefficient of determination on case 1 fell between 0.629 and 0.866; this was lower than case 2 value which fell between 0.946 and 0.998. Therefore, case 2 model would be a reliable choice.The coefficient of determination between the estimated figure using data which was developed to the regression model in 2012 and the actual measurement value was over 0.6, overall. It can be safely deduced that the correlation value between the two findings was high. The same model can be applied to get TOC concentrations in future.

The Influence of Land Use on Water Quality in the Tributary of the Yeongsan River Basin (영산강수계 소하천 유역의 토지이용이 하천수질에 미치는 영향 분석)

  • Jung, Jae-Woon;Lim, Byung-Jin;Cho, So-Hyun;Choi, Jin-Hee;Song, Kwang-Duck;Ha, Don-Woo;Kim, Hae-Sung;Park, Seung-Ho;Hwang, Tae-Hee;Jung, Soo-Jung;Lee, Dong-Jin;Kim, Kap-Soon
    • Korean Journal of Ecology and Environment
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    • v.45 no.4
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    • pp.412-419
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    • 2012
  • This study assessed the impacts of land use types on water quality in the tributary of the Yeongsan river basin. Temporal changes in water quality parameters (BOD, COD, TOC, T-P, T-N, SS) were investigated. 13 water sampling sites were selected; they were then collected and analyzed according to the standard method. The results showed that water quality parameters of the study sites ranged as follows : BOD, from 0.3 to $21.9mg\;L^{-1}$ (mean $3.3mg\;L^{-1}$); COD, from 1.0 to $38.0mg\;L^{-1}$ ($6.4mg\;L^{-1}$); TOC, from 0.6 to $20.0mg\;L^{-1}$ ($4.5mg\;L^{-1}$); T-P, from 0.009 to $1.973mg\;L^{-1}$ ($0.144mg\;L^{-1}$); T-N, from 0.6 to $17.1mg\;L^{-1}$ (mean $3.5mg\;L^{-1}$); SS, from 0.3 to $292.0mg\;L^{-1}$ ($20.3mg\;L^{-1}$). Generally, the paddy and upland dominated region had high concentrations of water quality parameters, whereas the forest dominated region had low concentrations. In addition, water quality parameters were positively correlated with paddy and upland, whereas the parameters were negatively correlated with forest. The result implies that paddy and upland are the dominant factors leading to stream pollution in the study sites, while a higher percentage of forest area contributes to improved water quality. Therefore, it is important to manage paddy and upland in order achieve efficient management of water quality.

A Study on Characteristics of Natural Organic Matter using XAD and FTIR in Yeongsan River System (XAD 및 FT-IR을 이용한 영산강수계 광주시 유역 자연유기물질의 분포특성 연구)

  • Lee, Dong-Jin;Chon, Kang-Min;Kim, Sang-Don;Jung, Soo-Jung;Lee, Kyung-Hee;Hwang, Tae-Hee;Lim, Byung-Jin;Cho, Jae-Weon
    • Korean Journal of Ecology and Environment
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    • v.44 no.4
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    • pp.358-363
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    • 2011
  • This study investigated the characteristics of natural organic matter(NOM) with tXAD resin and FT-IR in the Yeongsan river system of Gwangju region. NOM fractionation by XAD 8/4 resins was used to classify hydrophobic and hydrophilic substances. FTIR was applied to classify functional groups in the structure of NOM. In the XAD investigation, most of the four site-samples were mainly hydrophilic substances. In March, hydrophobic substances were dominant in the Gwangju 1 site (GJ-1), while hydrophilic substances were dominant for the other sites. In May, samples of all four sites were hydrophilic with a vigorous activity of microorganism due to increasing temperatures. The October results were very similar with those from March. In the FT-IR investigation, most of the broad and large peaks were assigned to the aliphatic group, particularly the OH group, C-H, $C-H_2$, $C-H_3$, and C-O alcohol group. All were related to hydrophilic substances. Other peaks showed the aromatic group, particularly the C=O (Ketone) Group. As a result, there is an identification of NOM in the Yeongsan river system composing mainly of hydrophilic substances and functional groups (OH, C-H etc.) of the aliphatic compound.

Analysis of Water bady Damage at Osu Stream Using the Flow-Loading Equation and 8-Day Intervals Cumulative Flow Duration Curve (유량-부하량 관계식과 8일 간격 누적유량지속곡선을 이용한 오수천의 수체 손상도 분석)

  • Lee, Young Sung;Kim, Young Suk;Han, Sung Wook;Seo, kwon ok;Lim, chang bok;Lee, Yeong Jae;Kim, Kyunghyun;Jung, Kang-Young
    • Journal of Environmental Science International
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    • v.27 no.12
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    • pp.1179-1193
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    • 2018
  • The purpose of this study at water quality pollutants to propose proper management method for the Osu-A unit watershed which is the influent tributary located upstream of the Sumjin -river among the 13 unit watersheds in the Sumjin-river water system. Analyzed the correlation between flow-pollution loading and the correlation between land use type, BOD and TP items, and analyzed 8-day intervals Cumulative Flow Duration Curve (CFDC) and Load Duration Curve (LDC) to evaluate water quality damage. As a result, both BOD and TP were larger than 1 and the concentration of water pollutants increased with increasing flow. BOD was positively correlated with Urban and Field, and TP was positively correlated with Field with 0.710. As a result of the LDC, BOD was analyzed that the target water quality was achieved with the excess rate of less than 50%, and TP exceeded the target water quality by 50.1%. BOD usually exceeded the standard value (exceedance probability 50%) at low flow zone and On the other hand, TP usually exceeded the standard value at high flow zone. Monthly BOD (April to June) and TP (May to August) exceeded the standard. Sewage Wastewater treatment and non-point pollution control is Osu-A unit watersheds are effective in improving BOD and TP.