• Title/Summary/Keyword: Water quality analyze

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Analysis of the Function of the Paddy-field in Purifying Water Quality (논의 수질정화 기능 분석)

  • Kim, Hyeon-Soo;Kim, Young-Il;Kim, Jin-Soo
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2003.10a
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    • pp.599-602
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    • 2003
  • The objective of this study is to analyze the function of the paddy-field in purifying water quality. This study was carried out is based on the data in the six case studies. To improve purification function of paddy field, the following farming management is required. 1) A guideline to control the inlet and outlet of the paddy plot is need to minimize drainage water by means of a reasonable irrigation management. 2) A guideline for fertilizer application in consideration of loading nutrients dissolved in irrigation water. 3) The reuse system of agricultural drainage water is required to minimize impacts on water quality of surface water(reservoir and river).

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36hrs Continuous Monitoring Methodology for Effluent and Receiving Water Quality (하천 수질에 대한 36시간 연속 모니터링 기법 연구)

  • 박정규;정홍배;문성환;류태권;류제영;황인영
    • Environmental Analysis Health and Toxicology
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    • v.16 no.4
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    • pp.153-159
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    • 2001
  • The main point source of pollution of the Keumho river in Taegu, Korea, stems from waste from the areas of industrial complexes . Although it is widely accepted that pollutants in waste water negatively effects general water quality, it is difficult to evaluate the effluent effect because of varying conditions in ambient water and inconclusive knowledge of causative pollutants. To analyze the water in relation to the industrial effluent in the area, pH. temperature, conductivity, and Microtox toxicity of various river samples were measured. Water samples were collected every 2 hours for 36 hours from Keumho river and Dalseo stream. Data from continuous monitoring for 36 hours showed that effluent in Keumho river originated from Dalseo stream, which is near adjacent to industrial complexes. Change in toxicity and other factors tested during the 36 hours indicated that continuous monitoring was necessary for a satisfactory effluent toxicity test Furthermore, in addition to water quality monitoring, it was concluded that sediment toxicity also needed to evaluate effluent effects.

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The Relationship between Algae Transport and Current in the Daecheong Reservoir (대청호 유속에 따른 조류이동 영향)

  • Yu, Soon-Ju;Hwang, Jong-Yeon;Chae, Min-Hi;Kim, Sang-Yong
    • Journal of Korean Society on Water Environment
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    • v.22 no.5
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    • pp.887-894
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    • 2006
  • Water quality in the Daecheong reservoir has been deteriorated by algal bloom every year. Algal bloom is propagated from eutrophicated tributary into the main body of the reservoir during the wet season. Nutrients from diffuse sources trigger the propagation of the algal bloom. This study is aimed to analyze relationship between the water current by the simulation and algae transport from the main body in the Daecheong reservoir including tributary where algal bloom has occurred seriously every year. Water quality model CE-QUAL-W2 was applied to analyze water movement in draught season (2001) and flooding season (2003). The result of simulation corresponded with the observed water elevation level, 63~80 m and showed stratification of the Daecheong reservoir. In the draught season, as velocity and direction off low in the reservoir was estimated to affect algae transport including nutrient supply from small tributary, algal blooms occurred in the stagnate zone of middle stream of the reservoir. On the other hand, in the flooding season, it was resulted in nutrient transport from upstream of main reservoir and nutrients were delivered up to downstream by fast water velocity. In result, algal blooms occurred in stagnate zone of reservoir downstream as the current of downstream was retarded according to dam outflow control.

Spatiotemporal chlorine residual prediction in water distribution networks using a hierarchical water quality simulation technique (계층적 수질모의기법을 이용한 상수관망시스템의 시공간 잔류염소농도 예측)

  • Jeong, Gimoon;Kang, Doosun;Hwang, Taemun
    • Journal of Korea Water Resources Association
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    • v.54 no.9
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    • pp.643-656
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    • 2021
  • Recently, water supply management technology is highly developed, and a computer simulation model plays a critical role for estimating hydraulics and water quality in water distribution networks (WDNs). However, a simulation of complex large water networks is computationally intensive, especially for the water quality simulations, which require a short simulation time step and a long simulation time period. Thus, it is often prohibitive to analyze the water quality in real-scale water networks. In this study, in order to improve the computational efficiency of water quality simulations in complex water networks, a hierarchical water-quality-simulation technique was proposed. The water network is hierarchically divided into two sub-networks for improvement of computing efficiency while preserving water quality simulation accuracy. The proposed approach was applied to a large-scale real-life water network that is currently operating in South Korea, and demonstrated a spatiotemporal distribution of chlorine concentration under diverse chlorine injection scenarios.

Watershed Modeling Research for Receiving Water Quality Management in Hwaseong Reservoir Watershed (화성호 유역의 수질관리를 위한 유역모델링 연구)

  • Jang, Jae-Ho;Kang, Hyeong-Sik;Jung, Kwang-Wook
    • Journal of Korean Society on Water Environment
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    • v.28 no.6
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    • pp.819-832
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    • 2012
  • HSPF model based on BASINS was applied for the Hwaseong Reservoir watershed (HRW) to evaluate the feasibility of water quality management. The watershed was divided into 45 sub-basins considering various watershed environment. Streamflow was calibrated based on the measured meteorological data, discharge data of treatment plants and observed streamflow data for 2010 year. Then the model was calibrated against the field measurements of water qualities, including BOD, T-N and T-P. In most cases, there were reasonable agreements between observed and predicted data. The validated model was used to analyze the characterization of pollutant load from study area. As a result, Non-point source pollutant loads during the rainy season was about 66~78% of total loads. In rainy-season, water quality parameters depended on precipitation and pollutant loads patterns, but their concentration were not necessarily high during the rainy season, and showed a decreasing trend with increasing water flow. As another result of evaluation for load duration curves, in order to improve water qualities to the satisfactory level, the watershed managements considering both time-variant and pollution sources must be required in the HRW. Overall, it was found that the model could be used conveniently to assess watershed characteristics and pollutant loads in watershed scale.

Priority Selection of Water Quality Improvement Through Water Quality Data of Tributaries of Nakdong River (낙동강수계 지류 수질자료를 통한 수질개선 우선순위 선정)

  • Shim, Kyuhyun;Shin, Sangmin;Kim, Seongmin;Kim, Youngseok;Kim, Gyeonghoon
    • Journal of Korean Society on Water Environment
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    • v.36 no.5
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    • pp.364-372
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    • 2020
  • The "Master Plan for the Revitalization of Water in the Nakdong River" is designed for the fundamental improvement of water quality in the Nakdong River. The water quality and flow of the Nakdong River system tributaries was monitored in this study. Among the living environmental standard parameters of 195 rivers, BOD (Biochemical oxygen demand), T-P (Total phosphorus) and TOC (Total organic carbon) were assessed to analyze the water quality from 2012 to 2019. We examined the role of TOC. It was found that 12 rivers exceeded the water quality of the second grade (3.0 mg/L BOD standard, 0.1 mg/L T-P standard, 4.0 mg/L TOC standard) based on BOD and T-P concentrations: the Gumi stream, Gisegok stream, Yongha stream, Yongho stream, Changnyeong stream, Gajwa stream, Gwangok stream, Yeongsan stream, Toerae stream, Hwapo stream, Sangnam stream and Hogye stream. These rivers require strategies to improve the quality of the Nakdong River. Based on the ongoing project, it is possible to supplement the "Master Plan for the Revitalization of Water in the Nakdong River" and manage it after verifying it as a component of people's life and therefore used to establish water quality control measures.

Analysis of Trophic State Variation of Lake Yongdam in Dam Construction (담수 이후 용담호 영양상태 변동 요인 분석)

  • Yu, Soon-Ju;Chae, Min-Hee;Hwang, Jong-Yeon;Lee, Jea-an;Park, Jong-gyum;Choi, Tae-bong
    • Journal of Korean Society on Water Environment
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    • v.21 no.4
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    • pp.360-367
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    • 2005
  • We have performed to analyze the trophic state resulting of Lake Yongdam as a result of water quality and nutrient concentration. Lake Yongdam is artifitial multi-purpose Dam resulting from the floods of 2001. The water quality of Lake Yongdam may affect the status of the Geum river basin including the Daecheong reservoir. It is necessary to understand the trophic state to assess water quality until stability after flooding. Water quality was surveyed using depth and hydraulic condition analysis. Further density flow was estimated for stratification and trophic state of Lake Yongdam by chlorophyll ${\alpha}$ concentration (2001~2004). And Environmental factors on chlorophyll ${\alpha}$ concentration were analyzed statistically. Trophic state was evaluated as the oligotrophic state at the main stream of the reservoir and eutrophic state at the upper stream in 2001, but evaluated as eutrophic state in 2002 and 2003 by TSI of Aizaki. From the results of multiple regression analysis using stepwise method, chlorophyll ${\alpha}$ concentration was shown to be very significant when nutrient concentration is high upon initial filling of the Dam. Chlorophyll ${\alpha}$ concentration varied according to sample site, season and year. Concentration were high in the upper stream of Lake Yongdam 4, algae bloom in these watershed were affected by location and high nutrient levels in the summer season which have in turn increased phytoplankton bloom into the reservoir.

Temporal and Spatial Analysis of Water Quality Data Observed from Major Water Quality Stations in Nakdonggang Watershed (낙동강 유역 주요 수질측정지점의 시·공간적 수질특성 분석)

  • Kim, So Rae;Kyung, Jo Hyun;Kim, Sang Min
    • Proceedings of the Korea Water Resources Association Conference
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    • 2017.05a
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    • pp.545-545
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    • 2017
  • The purpose of this study was to analyze the characteristics of water quality and spatial and temporal water quality in Nakdong River basin. Spatial changes of water quality in Nakdong River due to inflow of sewage treatment plant and main tributaries were analyzed. The water quality data were collected from the water environment information system of the National Institute of Environmental Research (NIED) for 8 days interval from 2004 to 2015, and the collected data were analyzed for water quality items (flow rate, BOD, TN, TP). The discharge water quality data of 32 sewage treatment plants were collected from the National Institute of Environmental Research (NIER) nationwide from 2012 to 2015 and arithmetically averaged over the spring and autumn seasons.

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Influence of Landuse Pattern and Seasonal Precipitation on the Long-term Physico-chemical Water Quality in Namhan River Watershed (남한강 수계에서 장기 이화학적 수질특성에 대한 토지이용도 및 계절성 강우의 영향)

  • Lee, Ji-Eun;Choi, Ji-Woong;An, Kwang-Guk
    • Journal of Environmental Science International
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    • v.21 no.9
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    • pp.1115-1129
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    • 2012
  • The objective of this study was to analyze long-term annual and seasonal trends of water chemistry on landuse patterns and seasonal precipitation using 72 sampling sites within Namhan River watershed during 2001-2010. Water quality, based on multi-parameters of water temperature(WT), dissolved oxygen(DO), biochemical oxygen demand(BOD), chemical oxygen demand(COD), suspended solids(SS), total nitrogen(TN), total phosphorus(TP), and electric conductivity(EC) varied largely depending on monsoon rain and landuse patterns such as forest, cropland, and residence. Concentrations of BOD and COD as an indicator for organic matter pollution, increased during summer monsoon season at the cropland and residential streams. Values of TN and TP were higher in residential streams than in the forest and cropland streams. In the meantime, DO values had weak relations to the landuse patterns of forest and cropland cover. Water quality was worst in cropland and residential streams, and also most degradated in 4th order streams. Overall, our results suggest that efficient water quality management is required in the cropland and residential landuse streams.

A Study on the Water Quality for Efficient Management in the Water Tanks (저수조의 효율적 관리를 위한 수질실태에 관한 연구)

  • Park, Hyun-Geoun;Ryu, Seung-Chul;Jun, Soo-Im
    • Journal of Environmental Science International
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    • v.18 no.12
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    • pp.1339-1347
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    • 2009
  • This study tried to investigate and analyze the actual state such as the regional, classified, and material characteristics of the water quality in order to research the several factors by which the filtrated water of the total 250 cases can be polluted in the water tank. The 215 points (86%) clean the water tanks twice a year regularly and J-city has done the best job of cleaning the water tanks. The fifty points (20%) of the total 250 investigation points examine the water quality of the water tanks every year, however, the 175 investigation points (70%) do not execute the inspection of water quality. In the case of the regional characteristics in the water quality, the 23 points (46%) in H-county, the 17 points (34%) in S-county, and the 16 points (32%) in G-city are incongruent in the standard, and the incongruity ratio of the water quality in J-city is the lowest. The result of the classified incongruity shows that total coliforms were found at the 61 investigation points, mesophilic bacteria were found at the 27 points, and turbidity was found at the 12 points. In the case of the material incongruity, concrete was found at the 63 investigation points as the most distinguished factor, and FRP (fiberglass reinforced plastic) at the 23 points, SMC (sheet molding compound) at the 12 points, and stainless steel was found at the 2 points.