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Finite Element Simulation of Total Nitrogen Transport in Riparian Buffer in an Agricultural Watershed

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  • Xiaosheng Lin

    (Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130000, China
    College of Environment and Resource, Jilin University, Changchun 130000, China)

  • Jie Tang

    (Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130000, China
    College of Environment and Resource, Jilin University, Changchun 130000, China)

  • Zhaoyang Li

    (College of Environment and Resource, Jilin University, Changchun 130000, China)

  • Haiyi Li

    (College of Environment and Resource, Jilin University, Changchun 130000, China)

Abstract

Riparian buffers can influence water quality in downstream lakes or rivers by buffering non-point source pollution in upstream agricultural fields. With increasing nitrogen (N) pollution in small agricultural watersheds, a major function of riparian buffers is to retain N in the soil. A series of field experiments were conducted to monitor pollutant transport in riparian buffers of small watersheds, while numerical model-based analysis is scarce. In this study, we set up a field experiment to monitor the retention rates of total N in different widths of buffer strips and used a finite element model (HYDRUS 2D/3D) to simulate the total N transport in the riparian buffer of an agricultural non-point source polluted area in the Liaohe River basin. The field experiment retention rates for total N were 19.4%, 26.6%, 29.5%, and 42.9% in 1,3,4, and 6m-wide buffer strips, respectively. Throughout the simulation period, the concentration of total N of the 1mwide buffer strip reached a maximum of 1.27 mg/cm 3 at 30 min, decreasing before leveling off. The concentration of total N about the 3mwide buffer strip consistently increased, with a maximum of 1.05 mg/cm 3 observed at 60 min. Under rainfall infiltration, the buffer strips of different widths showed a retention effect on total N transport, and the optimum effect was simulated in the 6mwide buffer strip. A comparison between measured and simulated data revealed that finite element simulation could simulate N transport in the soil of riparian buffer strips.

Suggested Citation

  • Xiaosheng Lin & Jie Tang & Zhaoyang Li & Haiyi Li, 2016. "Finite Element Simulation of Total Nitrogen Transport in Riparian Buffer in an Agricultural Watershed," Sustainability, MDPI, vol. 8(3), pages 1-14, March.
  • Handle: RePEc:gam:jsusta:v:8:y:2016:i:3:p:288-:d:66209
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    References listed on IDEAS

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    1. Lynch, Lori & Brown, Cheryl, 2000. "Landowner Decision Making About Riparian Buffers," Journal of Agricultural and Applied Economics, Southern Agricultural Economics Association, vol. 32(3), pages 1-12, December.
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    Cited by:

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    2. Xiaolin Huang & Han Chen & Fang Xia & Zhenfeng Wang & Kun Mei & Xu Shang & Yuanyuan Liu & Randy A. Dahlgren & Minghua Zhang & Hong Huang, 2018. "Assessment of Long-Term Watershed Management on Reservoir Phosphorus Concentrations and Export Fluxes," IJERPH, MDPI, vol. 15(10), pages 1-12, October.

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