• Title/Summary/Keyword: Nonpoint pollutant source

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A Study on the Assessment of Pollution Loads at Small Stream in Yeongsan River Watershed (영산강수계 소하천의 오염부하량 평가에 관한 연구)

  • Ha, Don-Woo;Shim, Hongbin;Kim, Haesung;Kim, Yoonsoo;Cho, Sohyun;Song, Chang-Soo;Kang, Taegu;Kim, Yeong-Suk
    • Journal of Korean Society on Water Environment
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    • v.34 no.1
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    • pp.1-9
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    • 2018
  • In this study, the load of the river was calculated by using the actual data of the Yeong-bon C1, Yeong-bon C2, Yeong-bon C3 monitoring points of the Yeong-san river watershed to determine the excess. As a result, the BOD is 75.83 % at the Yeong-bon C1 and the five-year average value is higher than at other points. The Yeong-bon C3 was 72.15 % and Yeong-bon C2 was analyzed as 68.78 %. The five-year average of the T-P was 71.95 % for the Yeong-bon C2 and 69.86 % for the Yeong-bon C3 and 69.16 % for Yeong-bon C1; these levels exceeded the target water quality standards of 50 %. As a result of analyzing the pollutant load, we found that the Yeong-bon C1 has been highly affected by the nonpoint pollution source because the excess rate is high in the upper section of the flow rate. The Yeong-bon C2 showed a high excess rate in the lower part of the flow rate, and it was estimated that the influence of the point pollution source was large. The excess rate of the Yeong-bon C3 is small in the interval deviation, and it was evaluated as being affected by both point and non-point pollution sources. The TMDL monitoring network data were used to estimate the exceed ratio for the target water quality assessment, and the implementation evaluation was made by the flow exceedance probability interval to analyze the monitoring data so that the data could be utilized according to the purpose of the measurement network.

Estimating Unit Load of Non-Point Source Pollutants for Landuse Types in Anseongchun Watershed (안성천 유역의 토지이용별 비점오염원 원단위 산정)

  • Hwang, Byung-Gi
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.5
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    • pp.1026-1033
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    • 2009
  • In this study, we computed the unit load of nonpoint source for the forest, agricultural, and urban representative region in Anseongchun watershed. In addition, Flow-weighted mean concentration (FWMC) that well represents runoff characteristics of storm water during rainfall, was calculated, and runoff pollutants loading was also examined. FWMCs of 1st rainfall, which runoff coefficient was high, had a tendency higher than those of 2nd rainfall. Based on landuse results, pollutant concentration of the non-urban such as forest and agricultural regions was higher than that of urban region. In case of BOD, runoff pollutants loading was calculated as 1,395, 1,623, 2,268kg/d in 1st rainfall for forest, agricultural, and urban regions, respectively, while runoff loading of 2nd rainfall was 503kg/d in forest), 512kg/d in agricultural, and 898kg/d in urban. By landuses, unit load of the urban as 72.7kg/ha/yr was 12 times higher than that of the agricultural as 6.5kg/ha/yr, and 8 times higher than that of the forest as 9.5kg/ha/yr.

Application of AGNPS Model for Nitrogen and Phosphorus Load in a Stream Draining Small Agricultural Watersheds (소규모 농업유역에서 질소와 인의 하천 부하에 대한 AGNPS 모형의 적용)

  • Kim, Min-Kyeong;Choi, Yun-Yeong;Kim, Bok-Jin;Lim, Jun-Young;Chung, Jong-Bae
    • Korean Journal of Environmental Agriculture
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    • v.20 no.3
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    • pp.192-200
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    • 2001
  • The event-based agricultural non-point source(AGNPS) pollution model was applied to estimate the loads of nitrogen and phosphorus in a stream draining small agricultural watersheds. Calibration and verification of the model were performed using observed data collected from rainfall events in the Imgo watersheds during 1997-1998. Parameter calibrations were made for the runoff curve number. The peak flow volumes in the watersheds were well reproduced by the modified model. Average deviation between observed and simulated values was 10%, and this match was confirmed by the coefficient of efficiency value of 0.97. The deviations tended to increase as the peak flows increased. The simulated total N concentrations in the stream water were fairly close to the measured values, and the coefficient of efficiency in the estimation was 0.93. However, there were relatively large variations between calculated and observed values of total P concentration, and the coefficient of efficiency in the estimation was 0.74. Any inaccuracies that arise in estimating runoff flow and nutrient loading can not be explained exactly and further adjustment and refinements may be needed for application of AGNPS in agricultural watersheds. With this restrictions in mind, it can be concluded that AGNPS can provide realistic estimates of nonpoint source nutrient yields.

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A Study on Development of Management Targets and Evaluation of Target Achievement for Non-point Source Pollution Management in Saemangeum Watershed (새만금 비점오염원 관리지역에서의 목표설정 및 달성도 평가방법론 연구)

  • Kim, Eun-Jung;Park, Bae-Kyung;Kim, Yong-Seok;Rhew, Doug-Hee;Jung, Kwang-Wook
    • Journal of Korean Society of Environmental Engineers
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    • v.37 no.8
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    • pp.480-491
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    • 2015
  • In this study, methods using LDC (Load Duration Curve) and watershed model were suggested to develope management targets and evaluate target achievement for non-point source pollution management considering watershed and runoff characteristics and possibility for achievement of target. These methods were applied for Saemangeum watershed which was designated as nonpoint source pollution management area recently. Flow duration interval of 5 to 40% was selected as flow range for management considering runoff characteristics and TP was selected as indicator for management. Management targets were developed based on scenarios for non-point source pollutant reduction of management priority areas using LDC method and HSPF model which was calibrated using 4 years data (2009~2012). In the scenario of LID, road sweeping and 50% reduction in CSOs and untreated sewage at Jeonju A20 and 30% reduction in fertilizer and 50% in livestock NPS at Mankyung C03, Dongjin A14 and KobuA14, management targets for Mangyung bridge, Dongjin bridge, Jeonju stream and Gunpo bridge were developed as TP 0.38, 0.18, 0.64 and 0.16 mg/L respectively. When TP loads at the target stations were assumed to have been reduced by a certain percentage (10%), management targets for those target stations were developed as TP 0.35, 0.17, 0.60 and 0.15 mg/L respectively. The result of this study is expected to be used as reference material for management master plan, implementation plan and implementation assessment for non-point source management area.

Transport of nonpoint source pollutants and stormwater runoff in a hybrid rain garden system (하이브리드 빗물정원 시스템에서의 비점오염물질 및 강우유출수 이송 특성)

  • Flores, Precious Eureka D.;Maniquiz-Redillas, Marla C.;Geronimo, Franz Kevin F.;Alihan, Jawara Christian P.;Kim, Lee-Hyung
    • Journal of Wetlands Research
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    • v.18 no.4
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    • pp.481-487
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    • 2016
  • In this research, a pilot scale hybrid rain garden system was developed in order to investigate the efficiency in the different components of the hybrid rain garden system and at the same time evaluate the initial efficiency of the system in treating urban stormwater runoff prior to its actual use in the field. Experimental runs were conducted using synthetic runoff having target concentrations similar to that of the typical runoff characteristics found in different countries and in Korea. With the employment of the hybrid rain garden system, hydrologic improvement was observed as the system demonstrates an approximately 95% reduction in the influent runoff volume with 80% retained in the system, and 15% recharged to groundwater. The reduction was contributed by the retention capabilities of ST and infiltration capabilities in PB and IT. With the combined mechanisms such as filtration-infiltration, biological uptake from plants and soil and phytoremediation that are incorporated in PB and IT, the system effectively reduces the amount of pollutant concentration wherein the initial mean removal efficiency for TSS is 87%, while an approximate mean removal efficiency of 76%, 46% and 56% was observed in terms of organics, nutrients and heavy metal, respectively. With these findings, the research helps in the further improvement, innovation and optimization of rain garden systems and other facilities as well.

Analysis of Relationship Between Water Quality Parameters in Agricultural Irrigation Reservoirs and Land Uses of Associated Watersheds (농업용저수지 유역의 토지이용과 수질항목 간의 상관관계 분석)

  • Yoon, Chun-Gyeong;Lee, Sae-Bom;Jung, Kwang-Wook;Han, Jung-Yoon
    • Korean Journal of Ecology and Environment
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    • v.40 no.1
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    • pp.31-39
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    • 2007
  • Monitoring data of 48 agricultural irrigation reservoirs from 1999 to 2004 was analyzed for water quality characteristics including biochemical oxygen demand $(BOD_5)$, chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP), and chl-${\alpha}$. Land uses of the watersheds associated with these reservoirs were determined for residential, forest, upland, paddy and miscellaneous, and regressed against water quality characteristics. Correlation analysis showed that forest land use was negatively correlated with all the water quality characteristics implying it's beneficial effects in water quality perspectives. Other land uses including residential, upland, and paddy generally illustrated positive correlation with water quality characteristics, which indicates most human activities of the watershed could degrade water quality of the receiving water bodies. Paddy land use partially contributed to the water quality degradation in contrast to the previous studies. It might be attributed to the relatively clean water quality of the study area, where even slight pollutant loading could degrade sensitively water quality. Further investigation is recommended for the effect of proximity as well as land use portions on the water quality of receiving water body.

A Preliminary Verification of the Influences of Hydrologic Regime Change and Nutrients Influx on Vegetation Recruitment on Riparian Bars (하천식생 이입 현상에 대한 수문현상 변화와 영양염류 영향의 예비 검증)

  • Woo, Hyoseop;Kang, Joon-goo;Cho, Hyung-Jin;Choi, Yi-song;Park, Moon-hyeong
    • Ecology and Resilient Infrastructure
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    • v.2 no.4
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    • pp.284-290
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    • 2015
  • In this study, two hypotheses were examined to preliminarily verify for the vegetation recruitment and establishment on riparian bars in unregulated rivers; hydrologic regime change and nutrients influx into streams. In order to preliminarily verify the first hypothesis, precipitation patterns were analyzed during a period from March through to May when reeds, the most common riparian vegetation in Korea, germinate and start to grow in riparian areas. The results show that during the last 35 years, the total precipitation during the three-month period decreased by about 15 %, while the total annual one increased by about 15% in Korea. In order to verify the second hypothesis, a preliminary experiment was conducted with a set of two-vegetative flumes for one year. In this experiment, a stream flow with reeds on the riparian sand bars was simulated with a flume with reeds planted on the sand bed and water with a concentration of 3.5 mg of N flowing in the flume for four hours. For comparison, clean water was circulated in the same way in another flume for simulating a stream flow without N. The experimental results show that the growth rate of reeds in N-mixed flow exceeds that in clean water flow by about 30%. The above two results could explain the phenomenon of change in unregulated rivers from white river to green river in Korea, although they were obtained through limited extents of analysis and experiment.

The Study on Methods for Setting of Water Quality Goal and Estimation of Allocation Loads on TMDL System Using a Dynamic Water Quality Model (동적모델을 이용한 수질오염총량제 목표수질 설정 및 할당부하량 산정방안 연구)

  • Kim, Eun-Jung;Park, Bae-Kyung;Shin, Dong-Suk;Kim, Yong-Seok;Rhew, Doug-Hee
    • Journal of Korean Society of Environmental Engineers
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    • v.36 no.9
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    • pp.629-640
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    • 2014
  • In this study, the applicability of dynamic water quality model to TMDL system was examined, methods for setting of water quality goal and estimation of allocation loads were suggested and results of applying these methods were analyzed. HSPF model was applied for Miho stream basin as a dynamic water quality model. The model was calibrated using measurement data obtained in 2009~2010 and showed satisfactory performance in predicting daily variations of flow rate and BOD concentration. Methods for TMDL application were categorized into 3 cases; water quality management (1) considering low flow condition(Case I), (2) considering entire period of the year (Case II) and (3) considering the worst water quality condition (Case III). BOD water quality goals at the end of Miho stream watershed increased in the order of Case IICase I>Case III. If further researches on base precipitation and method for model input of nonpoint source pollutant were carried out, water quality could be managed more reasonably and scientifically by applying dynamic water quality model to TMDL. The result of this study is expected to be used as primary data for TMDL using dynamic water quality model.

Characteristics of heavy metal concentrations in urban stormwater runoff, Daejeon, Korea (도시 유역 강우유출수 내 중금속 농도의 변화 특성에 관한 연구)

  • Yu, Eunjin;Seo, Dongil
    • Journal of Korea Water Resources Association
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    • v.51 no.10
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    • pp.917-927
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    • 2018
  • Seven heavy metal concentrations (As, Cd, Cr, Cu, Ni, Pb, Zn) were continuously analyzed for twenty rainfall events in 2017~2018 in an urban basin. The overall and dynamic correlations between runoff characteristics and heavy metal concentrations were examined. The peak metal concentration generally appeared in the initial runoff but found to be delayed when the rainfall intensity was low. The rainfall duration had no relationship with either heavy metal concentrations or their total mass. Dynamics of heavy metal mass (load), with the exception of Cu and Zn, showed strong correlation with the 30 minute rainfall intensity (0.60~0.88) and runoff volume (0.74~0.89). While event mean concentration (EMC) showed positive correlation (0.54~0.73) with antecedent dry days (ADD), no significant relationship was found between runoff volume and pollutant concentration. This implies that the pollutants built up on the surface during dry days are washed off even with low rainfall energy. The dynamics of heavy metal and TSS concentrations showed good correlation (0.68~0.87). This result shows that the metals are transported along with solid particles as adsorbate in surface runoff. Regular street sweeping will reduce significant amount of heavy metal loads in urban surface runoff.

A Plot Scale Experiment to Assess the NPS Reduction of Sediment Trap for Non-irrigated Cropland (침사구의 밭 비점오염 저감효과 평가를 위한 포장실험 연구)

  • Park, Tae-Yang;Kim, Sung-Jae;Jang, Jeong-Ryeol;Choi, Kang-Won;Kim, Sang-Min
    • Journal of agriculture & life science
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    • v.45 no.5
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    • pp.97-103
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    • 2011
  • The purpose of this study was to analyze the pollutant reduction effect for non-irrigated crop land by nonpoint source pollution control. For a field scale monitoring, 6 plots (5m width and 22m length) and 3 sediment traps were installed. At the outlet of each plot, the stage gauges were installed for runoff monitoring. For a rainfall monitoring, tipping bucket rain gage was installed within the experiment site. Through the artificial irrigation, runoff from the plots were monitored. The SS, TOC, T-N, T-P, COD, NTU of sampled water were analyzed by standard methods. The SS, TOC, T-N, T-P, COD, NTU concentration of initial runoff were 15.00, 1.54, 5.27, 0.07, 4.72, 0.45mg/L, respectively. Four hours later than the initial runoff, the concentration was changed to 1.00, 0.94, 4.06, 0.01, 0.60, 0.33 mg/L, respectively. As a result of artificial irrigation, three out of four sediment traps were filled with runoff water from the experimental plots. One sediment trap was not filled with runoff water because the artificial irrigation was not supplied for two experimental plots. The stage of sediment traps were gradually lowered. However, the water quality didn't showed a decrease trend as the stage went down because the suspended solid was not equally collected during the water sampling.