• Title, Summary, Keyword: river water

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Parameteric Assessment of Water Use Vulnerability of South Korea using SWAT model and TOPSIS (SWAT 모형과 TOPSIS 기법을 이용한 우리나라 물이용 취약성 평가)

  • Won, Kwyang Jai;Sung, Jang Hyun;Chung, Eun-Sung
    • Journal of Korea Water Resources Association
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    • v.48 no.8
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    • pp.647-657
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    • 2015
  • This study assessed the water use vulnerability for 12 basins of South Korea. The annual runoff of 12 basins are derived using a Soil and Water Assessment Tool (SWAT) and the calculated runoff per unit area and population are compared with each basin. The 18 indicators are selected in order to assess the vulnerability. Those are classified by aspects of demand, loss and supply of water use. Their weighting values used Entropy method to determine objective weights. To quantitatively assess the water use vulnerability, the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) based on multi-criteria decision making are applied. The results show that the water availability vulnerability of Hyeongsan River has the highest value followed by Sapgyo River; Dongjin River; Seomjin River; Anseong River; Mangyung River; Nakdong River; Tamjin River; Youngsan River, Geum River; Taehwa River; and Han River. The result of this study has a capability to provide references for the index deveopment of climate change vulnerability assessment.

The Estimation of Contribution Ratio for Sub Stream in Nam River Basin (남강유역 지류·지천별 영향도 평가)

  • Lee, Jae-Woon;Kwon, Heon-Gak;Kwak, In-Soo;Youn, Jong-Soo;Cheon, Se-Uk
    • Journal of Environmental Impact Assessment
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    • v.21 no.5
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    • pp.745-755
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    • 2012
  • The relations between tributaries and mainstream were identified with the water qualities measurements in the field. Parameters of water qualities were BOD, T-N, T-P and measurements were performed by 4 events of rainfalls for 2011. The precipitation data influenced on pollutants loads. Pollutants loads were fluctuations with the seasonal variation. Gajoacheon contributed in 18.39% of BOD, 23.79% of T-N, 15.23% of T-P and Nabulcheon contributed in 13.54% of BOD, 13.05% of T-N and 13.66% of T-P in the region from Nam River_C to Nam River_D. In case of the region from Nam River_C to Nam River_D, Yongacheon river inflowed to main stream as 23.65% of BOD, 20.74% of T-N, and 15.05% of T-P.

Water Quality and Phytoplankton Distribution Pattern in Upper Inflow Rivers of Lake Paldang (팔당호 상류 유입하천의 수질 및 식물플랑크톤 분포 패턴)

  • Park, H.-K.;Byeon, M.-S.;Kim, E.-K.;Lee, H.-J.;Chun, M.-J.;Jung, D.-I.
    • Journal of Korean Society on Water Environment
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    • v.20 no.6
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    • pp.615-624
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    • 2004
  • The distribution pattern of water quality parameters and phytoplankton biomass in upper inflow rivers of lake Paldang had surveyed. In North-Han river system, nutrient concentrations and algal biomass was below the standard of mesoand oligotrophy from lake Soyang to lake Paldang, maintaining good water quality, except the N5 site located near the Chuncheon-Si, showing high nutrients concentrations and algal biomass. The algal biomass of the South-Han river system showed oligotrophic level in the upstream near the lake Chungju, and increased along the flow direction showing eutrophic level in the downstream within the lake Paldang area. On the other hand, the highest concentrations of nutrients were detected in the middle stream near the Yeoju-Si and Yangpyung-Gun rather than in the downstream suggesting algal biomass in lake Paldang would not come from the upper river area but come from the growth within the lake area using nutrients from the upper inflow river.

The Effect of for Major River Project and Kumho River on Nakdong River's Water Quality - Focused on Kangjung-Koryung Weir (4대강 사업과 금호강의 수질이 낙동강 본류에 미치는 영향에 대한 연구 - 강정고령보 공사현장을 중심으로)

  • Hwang, Sam-Jin;Bae, Hun-Kyun;Kim, Hak-Yoon
    • Journal of Environmental Science International
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    • v.22 no.6
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    • pp.695-703
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    • 2013
  • In this study, the effects of four major river project and Kumho River, second biggest branch of Nakdong River, were investigated to provide basic data for proper management of Nakdong River's water quality. Daily sampling processes at three different points, Munsanri (the upper side of Kangjung-Koryung weir), Kangchang (the outlet of the Kumho River) and Samunjin (the lower side of Kangjung-Koryung weir and junction of Kumho River and Nakdong River), were conducted from May 1st 2011 to Sep. 4th 2011. Water samples were analyzed for nine factors, DO, BOD, COD, T-N, T-P, pH, turbidity, SS, and coliform. As demonstrated by the results, concentrations of BOD, T-N, T-P and coliform at Nakdong River were affected by water quality of Kumho River while SS and turbidity were affected by constructions for Kangjung-Koryung weir. Further studies, for example, affects of wastewater treatment facilities, should be followed.

Numerical Simulation of Water Quality Enhancement by Removal of Contaminated Bed Material (하상오염물 제거에 의한 수질개선효과 수치모델링)

  • Lee, Nam-Joo
    • Journal of Korean Society of Water and Wastewater
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    • v.25 no.3
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    • pp.349-357
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    • 2011
  • This study has an objective to estimate effect on water-quality enhancement by removal of contaminated river-bed material using a two-dimensional numerical modeling in the Seonakdong River, the Pyunggang River and the Maekdo River. RMA2 and RMA4 models were used for flow and contaminant transport simulation, respectively. After the analysis of the effects of flow restoration plan for the Seonakdong River system made by Lee et al (2008), simulation have been performed about scenarios which contains operations of the Daejeo Gate, the Noksan Gate, the Makdo Gate (on planning), and the Noksan Pumping Station. Because there is no option for elution from bed sediment in the RMA4 model, a simple technique has been used for initial condition modification for elution. The analyses revealed that the effect on water quality improvement due to dredging of bed sediment seemed to be less than 10 % of the total effect. The most efficient measure for the water quality improvement of the river system was the linked operation of water-gates and pumping station.

Watershed Management Plan through Water Quality Monitoring for Main Branches of 4 Water Systems in Chungcheongnamdo (충청남도 4대수계 주요 지류하천 수질 모니터링을 통한 유역 관리 방안)

  • Park, Sanghyun;Kim, Hongsu;Cho, Byunguk;Moon, Eunho;Choi, Jinha
    • Journal of Korean Society on Water Environment
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    • v.32 no.2
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    • pp.163-172
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    • 2016
  • This study aimed to develop a plan for effective performance of a watershed through correct identification of a river watershed by using the flowrate of the river and water quality data, which is the basis for the establishment of the water environment policy. The target river for water quality improvement was selected based on the monitoring result for 4 water systems in Chungcheongnamdo province in the recent 3 years. The result of analysis for the distribution of discharge capacity by a pollution source group for the water quality improvement target river showed that most of the target river has a high discharge capacity in the water system for living and livestock. Analysis for the density of the total discharge capacity of the whole watershed of Chungcheongnamdo indicated that the river that needs water quality improvement has high BOD concentration and high discharge load density at the point that this river is located. Thus, for efficient watershed management through selection and concentration, Chungcheongnamdo needs to improve the target river in priority. Stepwise planning is also required to establish and execute the water quality improvement in order to satisfy said target water quality, and establish the index for the water improvement rate for its evaluation.

Occurrence of Perchlorate in Drinking Water in Korea (국내 주요 정수장 수돗물의 퍼클로레이트 검출현황)

  • Kim, Hyun-koo;Kim, Joung-hwa;Lee, Youn-hee
    • Journal of Korean Society on Water Environment
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    • v.23 no.6
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    • pp.822-828
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    • 2007
  • Perchlorate is an unregulated contaminant but recently many cases of perchlorate contamination have been reported in the US. In Japan, also, a couple of contamination incidents caused by perchlorate occurred. Against this backdrop, investigation on perchlorate was urgent for Korea. Accordingly, perchlorate investigation in tap water and river water was conducted one time a week for seven consecutive weeks at major water sources of Korea including Han River, Guem River, Yeong-san River, and Nak-dong River. Perchlorate was not found at Han River, Guem River, and Yeong-san River. However, all the 4 tap water samples in Nak-dong River recorded high level of perchlorate. Among others, NT1 located at Daegu posted the highest value of $22.3{\mu}g/L$. This level is lower than $24.5{\mu}g/L$, the threshold recommended by US EPA. Still, perchlorate contamination in drinking water can deal a heavy blow to nerve development of infants and children by causing iodine deficiency. At the 1st and 2nd investigations, perchlorate concentration reached $18.7{\sim}95.6{\mu}g/L$ and $4.0{\sim}25.6{\mu}g/L$ respectively, both of which are relatively higher. The high perchlorate concentration in Nak-dong River was possible because of the waste water discharged from LCD manufacturing factory which was located at NS3 in Gumi, Korea. Perchlorate concentration of waste water from the factory was $730{\sim}1,858{\mu}g/L$.

WATER RESOURCES POLICY AND CONFLICT RESOLUTION IN SOUTH KOREA : WIN-WIN STRATEGY

  • Choi, Yearn-Hong;Lee, Tae-Sam
    • Water Engineering Research
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    • v.2 no.4
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    • pp.231-241
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    • 2001
  • Since South Korea has uneven rainfall and deteriorating water quality, it is imperative to create a comprehensive water resources policy and management. This paper is to adopt a win-win policy for upstream-downstream local governments that have been in water rights-related disputer or conflicts in the process of allocating water and maintaining water quality. The Win-Win Policy can be an integrated river-basin approach. We define the win-win policy, introduce the win-win case of Delaware River and Colorado River in the United States, and suggest the win-win policy for Nakdong River in South Korea. Nakdong River is chosen for this paper because it has more serious problems in preserving water quantity and maintaining water quality.

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Biiological Analysis of Water Quality from the Water System of Namcheon River, Kyungsan (경상남천수계의 생물학적 수질판정)

  • Suh, Younbg Hee;Sang Ock Park
    • Journal of environmental and Sanitary engineering
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    • v.5 no.1
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    • pp.46-53
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    • 1990
  • Analyzing the water quality biologically by the biotic index ($\beta$) of Beck-Tsuda method, for four sites of the water system of Namcheon River which reaches a length of 19.5km and flows through the kyungsan-town and Namcheon-myun in Kyungsan-gun of the suburbs of Taegu and extends to the Gumho-river on the lower, the results are summarized as follows: 1) An indicator species collected from the water system of Namcheon River comprises 78 species. Among them, 27 species are intolerant species and 51 species are tolerant species to water pollution. 2) The water of 2 sites, Weondong-bridge, Sanjeon-iron bridge was clearly water, oligosaprobic zone. The water of Youngdae-bridge was slightly polluted water, $\beta$-measosaprobic zone. But the water of Maehoildong bridge was severely polluted water, polysaprobic zone. 3) The Namcheon River was mainly polluted with sewage from the kyungsan town, with industrial wastes and products from many factories surviving the town. 4) The pH wate system of Namcheon River was alkalescent. 5) The map showing a class of water quality analyzed biologically was also prepared for each site of the water system of Namcheon River, Kyungsan. 6) It is requested that a waste water disposal plant should be established near Youngdae-bridge and Maehoildong-bridge respectively.

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Analysis of the Effect of Water Quality Improvement on Seomgang and South Han River by Securing the Flow during the Dry Season (갈수기 유량 확보에 따른 섬강 및 남한강 본류 갈수기 수질 개선 효과 분석)

  • Lee, Seoro;Lee, Gwanjae;Han, Jeongho;Lee, Dongjun;Kim, Jonggun;Lim, Kyoung Jae
    • Journal of The Korean Society of Agricultural Engineers
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    • v.61 no.2
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    • pp.25-39
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    • 2019
  • The water pollution Accident in the South Han River is increasing due to increase of pollutants inflow from small streams from rural areas and reduced flow rate. This study predicted the change of water quality in the main stream of the South Han River due to climate change through the linkage of watershed and water quality models. Also, This study analyzed the effect of water quality improvement on Seomgang and the South Han River by securing the flow during the dry season. According to the scenarios for securing the river flow during drought season, the river flow in the Seomgang is increased up to 2.19 times, and the water quality during the drought season was improved up to $BOD_5$ 20.5%, T-N 40.8%, T-P 53.4%. Also, the water quality of the main stream of the South Han River improved to 5.22% of $BOD_5$, 5.42% of T-N and 7.69% of T-P as the river flow was secured from the Seomgang. The result of this study confirms that securing the baseflow in the Seomgang according to the scenarios for securing the river flow during the dry season has a positive effect on the improvement of the water quality of the rivers in the main river of the Seomgang and South Han River. The results of this study will contribute to the establishment of reasonable management to improve the water quality of the main stream of the Seomgang and South Han River.