• Title/Summary/Keyword: agricultural non-point sources

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Long-term changes of water quality with regard to main Pollutant Sourses in Agricultural Reservoirs (주오염원별 농업용저수지의 장기 수질특성변화)

  • Choi, Sun-Hwa;Kim, Ho-Il;Yoon, Kyung-Seup;Park, Jong-Min
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2002.10a
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    • pp.425-428
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    • 2002
  • This study has been carried out to analized of long term changes of water quality with regard to main pollutant sources in agricultural reservoirs on the basis of data during 1996-2001. The major source was domestic wastewater(DWW) and water pollution by non-point sources(NPS) is increasing as time goes. It was determined that Seasonly average values of DWW were pH $7.6{\sim}8.7$, COD $7.0{\sim}9.4$, T-N $0.74{\sim}2.07$, T-P $0.05{\sim}0.62$, Live-stock wastewater(LWW) were pH $7.5{\sim}8.9$, COD $5.5{\sim}9.8$, T-N $0.57{\sim}1.91$, T-P $0.04{\sim}0.13$, NPS were pH $7.1{\sim}8.3$, COD $3.1{\sim}5.2$, T-N $0.29{\sim}1.44$, T-P $0.02{\sim}0.07$. Fluctuation of DWW and LWW were very wide and variable long term patterns of them were similar. Trophic states by Carlson Index of DWW and LWW was classified as eutrophic to hypretrophic from chl-a, T-P concentration.

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Nutrient Losses from a Paddy Field

  • Cho, Jae-Young;Han, Kang-Wan
    • Journal of Applied Biological Chemistry
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    • v.43 no.4
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    • pp.258-263
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    • 2000
  • The study was carried out to investigate the nutrient losses at a paddy field located at the southwest of central Korea from May 1, 1997 to April 30, 1998. The studying area was 10 ha. The amounts of nutrients loaded by runoff water were measured as follows. The total-N was 1,031 and $61kg\;10ha^{-1}$ during the irrigation and non-irrigation periods, respectively. The total amount of N from both periods was $1,092kg\;10ha^{-1}\;yr^{-1}$. The total-P was 23 and $2kg\;10ha^{-1}$ during the irrigation and non-irrigation periods, respectively. The total amount of P from both periods was $25kg\;10ha^{-1}\;yr^{-1}$. For percolationloss, the losses of total-N, ammonia-N, nitrate-N, and total-P were 167,30,122, and $3kg\;10ha^{-1}$, respectively. The respective loss ratios of N and P by runoff water were 55.2 and 11.9%, while the loss ratios of N and P by percolationwere 8.4 and 1.4%.

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Decision of Critical Area Due to NPS Pollutant Loadings from Kyongan Stream Watershed using BASINS-SWAT (BASINS-SWAT 모델을 이용한 경안천 유역의 비점원 오염배출 중점관리 대상지역 결정)

  • Jang, Jae-Ho;Yoon, Chung-Gyeong;Jung, Kwang-Wook;Son, Yeung-Kwon
    • Journal of The Korean Society of Agricultural Engineers
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    • v.51 no.5
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    • pp.69-78
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    • 2009
  • In order to improve water quality of upper watershed of Paldang reservoir, it is necessary to evaluate non-point source pollution loads and identify critical watershed pollution sources. A GIS based Soil and Water Assessment Tool was applied to evaluate model application and reliability, estimate NPS pollution load, identify critical watershed by NPS pollution sources, and suggest various best management practices for Kyongan Stream watershed. Yearly NPS pollution loads were estimated 30.0% SS, 60.1% TN and 35.4% TP, respectably. The watershed pollution load is mainly decided by precipitation condition and SS and nutrients load have a significant regression relationship. Based on 10-year average yearly NPS pollution load, critical sub-watersheds were identified. The No. 5 and 17 which have lots of relatively intensive agricultural fields and scattered industrial area were vary critical sub-watersheds and under more intensive pollution load. In order to control critical watershed, watershed best management practices such as scientific fertilizer, contour farming and parallel terrace, transferring the sloppy farmland to grass or forest and constructing a buffer zone, and constructing wetlands and retention ponds will be applied. Overall the SWAT model can be efficiently used for identification of critical sub-watersheds in order to develop a priority watershed management plan to reduce water pollutions.

Dynamic Runoff of Non-point Sources Pollutants from Agricultural Areas (농촌지역에서 유출시간에 따른 비점오염물질의 유출평가)

  • Yi, Qitao;Hur, Chinhyu;Kim, Youngchul
    • Journal of Korean Society on Water Environment
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    • v.24 no.6
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    • pp.773-783
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    • 2008
  • In this paper, data collected from 22 different rural watersheds during stormflow conditions were analyzed. Those watersheds consisted of forest and cultivated land. EMC data analysis indicates that as agricultural land use increases, EMC values of TSS, COD and TN clearly tends to increase, but TP does not show a significant increase. Pattern of the pollutographs mostly has a similarity in hydrograph shape except nitrogen which inherently shows a variability and complication. The fraction of soluble reactive-P to TP increases as cultivated land use increases while mobile-nitrogen portion was higher in the runoff from forested watersheds than agricultural areas. During stormflow, pollutograph of the nitrogen was determined mainly by change in Particle-TKN as other pollutants but its effect is thought to be masked by decrease of dissolved form of nitrogen due to the dilution.

Growth of Chinese Cabbage and Losses of Non-point Sources from Runoff and Leaching in Soils as Affected by Anaerobically Digested Liquid Pig Slurry (혐기소화 돈분 액비를 처리한 토양에서 배추의 생육과 비점오염원의 용탈 및 유거)

  • Ro, Hee-Myong;Choi, Hyo-Jung;Yun, Seok-In;Lee, Min-Jin;Kim, Jae-Min;Choi, Hong-Lim;Kun, Zhu
    • Korean Journal of Soil Science and Fertilizer
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    • v.41 no.2
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    • pp.112-117
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    • 2008
  • A pot experiment was conducted to study the effect of application rate of anaerobically digested pig slurry on the growth of Chinese cabbage and the outflow characteristics of N and P from leaching and runoff in the upland. Anaerobically digested pig slurry(ADPS) was applied rates of 0, 6, 12, and $18L\;pot^{-1}$, and Chinese cabbages were grown for 50 days. Dry matter yield of Chinese cabbage increased significantly at the rates of 6 and $12L\;pot^{-1}$, but decreased at the rate of $18L\;pot^{-1}$ due probably to the high salinity. The EC(1:5) of the soil receiving $18L\;pot^{-1}$ of anaerobically digested pig slurry was $0.28dS\;m^{-1}$, which was significantly higher than those receiving 6 and $12L\;pot^{-1}$ of anaerobically digested pig slurry. For the leachate and runoff, N and P concentration increased with the application rate of ADPS. Therefore, considering the dual goal of optimum crop growth and minimal discharge of non-point pollution sources to water system, this study suggests that a testing of a site-specific proper application rate of liquid pig slurry including ADPS is prerequisite to achieving optimum agricultural productivity while minimizing water quality degradatio.

Changes of Stream Water Quality and Loads of N and P from the Agricultural Watershed of the Chooryung-chon Tributary of the Sumjin River Basin

  • Cho, Jae-Young;Han, Kang-Wan;Choi, Jin-Kyu
    • Korean Journal of Environmental Agriculture
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    • v.19 no.5
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    • pp.370-374
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    • 2000
  • At this study, the monitoring network of water quality was established in the agricultural watershed an area 14,960 ha of the central southwest of Korea. Loads of nitrogen and phosphorus by agricultural land use were quantified bases on total amounts of stream flow. The land were used as a lowland paddy, an upland and a forest about 12.14 % (1,815 ha), 5.17 % (773 ha) and 80.31 % (12,015 ha) of the area, respectively. For six months, from May 1 to October 31, 1999, the total precipitation was 970 mm and the total amount of stream flow was $80,281,000\;m^3$. In the load of agricultural non-point sources relevant to land use, total-N was 138,413 kg, then ammonia-N 13,362 kg, nitrate-N 124,629 kg, and total-P 157 kg. The loss of nutrient which from application of chemical fertilizer were 38.0% in nitrogen and 0.1% in phosphorus to input chemical fertilizer in the watershed.

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A Study on Characteristics of Water Pollution in Woopo-Mokpo Wetlands (우포·목포늪 수질오염특성 연구)

  • Lee, Tae-Young;Yoon, Sung-Yoon
    • Journal of Wetlands Research
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    • v.1 no.1
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    • pp.1-5
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    • 1999
  • We could know that the Woopo and Mokpo wetlands, which have the typical colony structure in the agricultural area of korea, had a characteristic which the pollution sources of water are scattered widely and it is caused by sewage, livestock wastewater and non point sources. As the result of an examination of water, the concentration of T-N was measured highly within five grade in the lake standard. If we build natural domestic treatment system in Taehap-myon, lbang-myon and Yuo-myon, which are located at the upper stream of wetlands, we can remove SS, BOD, COD and T-N largely.

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Implementation of Polyacrylamide in the Agricultural Environment and its Recent Review

  • Choi, Yonghun;Kim, Minyoung;Kim, Youngjin;Jeon, Jonggil;Seo, Myungchul
    • Korean Journal of Soil Science and Fertilizer
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    • v.49 no.5
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    • pp.440-448
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    • 2016
  • Nonpoint sources of pollution (NPS) is defined as diffuse discharges of pollutants (e.g., nutrient, pesticide, sediment, and enteric microorganism) throughout the natural environment and they are associated with a variety of farming practices. Previous studies found that water soluble anionic polyacrylamide (PAM) is one of the highly effective measures for enhancing infiltration, reducing runoff, preventing erosion, controlling nonpoint source of pollutants, and eventually protecting soil and water environment. Potential benefits of PAM treatment in agricultural soil and water environments have been revealed by many research and they include low cost, easy and quick application, and suitability for use with other Best Management Practices (BMPs) for NPS control. This study reviews the various applications of PAM and discusses its further potentials in agricultural environment.

Analysis of Non-Point Pollution Sources in the Taewha River Area Using the Hyper-Sensor Information (하이퍼센서 정보를 이용한 태화강지역의 비점오염원 분석)

  • KIM, Yong-Suk
    • Journal of the Korean Association of Geographic Information Studies
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    • v.20 no.1
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    • pp.56-70
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    • 2017
  • In this study, multi-image information for the central Taewha River basin was used to develop and analyze a distribution map of non-point pollution sources. The data were collected using a hyper-sensor (image), aerial photography, and a field spectro-radiometer. An image correction process was performed for each image to develop an ortho-image. In addition, the spectra from the field spectro-radiometer measurements were analyzed for each classification to create land cover and distribution maps of non-point pollutant sources. In the western region of the Taewha River basin, where most of the forest and agricultural land is distributed, the distribution map showed generated loads for BOD($kg/km^2{\times}day$) of 1.0 - 2.3, for TN($kg/km^2{\times}day$) of 0.06 - 9.44, and for TP($kg/km^2{\times}day$) of 0.03 - 0.24, which were low load distributions. In the eastern region where urbanization is in progress, the BOD, TN, and TP were 85.9, 13.69, and 2.76, respectively and these showed relatively high load distributions when the land use was classified by plot.

Development of Integrated Water Quality Management Model for Rural Basins using Decision Support System. (의사결정지원기법을 이용한 농촌유역 통합 수질관리모형의 개발)

  • 양영민
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.42 no.5
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    • pp.103-113
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    • 2000
  • A decision support system DSS-WQMRA (Decision Support System-Water Quality Management in Rural Area) was developed to help regional planners for the water quality management in a rural basin. The integrated model DSS-WQMRA, written in JAVA, includes four subsystems such as a GIS, a database, water quality simulation models and a decision model. In the system, the GIS deals with landuse and the location of pollutant sources. The database manages each data and supplies input data for various water quality simulation models. the water quality simulation model is composed of the GWLF( Generalized Watershed Loading Function), PCLM(Pollutant Loading Calculation Module) and the WASP5 model. The decision model based on mixed integer programming is designed to determine optimal costs and thus allow the selection of managemental practices to meet the water quality criteria. The methodology was tested with an example application in the Bokha River Basin, Kyunggi Province in Korea. It was proved that the integrated model DSS-WQMRA could be very useful for water quality management including the non-point source pollution in rural areas.

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