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Measured and simulated soil wetting patterns under porous clay pipe sub-surface irrigation

  • Siyal, A.A.
  • Skaggs, T.H.
Registered author(s):

    Sub-surface irrigation with porous clay pipe can be an efficient, water saving method of irrigation for many less developed arid and semi-arid regions. Maximizing the efficiency of clay pipe irrigation requires guidelines and criteria for system design and operation. In this study, experimental and simulated (with HYDRUS (2D/3D)) soil wetting patterns were investigated for sub-surface pipe systems operating at different water pressures. Predictions of the soil water content made with HYDRUS were found to be in good agreement (R2=0.98) with the observed data. Additional simulations with HYDRUS were used to study the effects of various design parameters on soil wetting. Increasing the system pressure increased the size of the wetted zone. The installation depth affects the recommended lateral spacing as well as the amount of evaporative water loss. For a given water application, the potential rate of surface evaporation affected the shape of the wetted region only minimally. Soil texture, due to its connection to soil hydraulic conductivity and water retention, has a larger impact on the wetting geometry. In general, greater horizontal spreading occurs in fine texture soils, or in the case of layered soils, in the finer textured layers.

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    File URL: http://www.sciencedirect.com/science/article/B6T3X-4VF0XVS-1/2/2b381c2fee508a68d97b1e6640e442f9
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    Article provided by Elsevier in its journal Agricultural Water Management.

    Volume (Year): 96 (2009)
    Issue (Month): 6 (June)
    Pages: 893-904

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    Handle: RePEc:eee:agiwat:v:96:y:2009:i:6:p:893-904
    Contact details of provider: Web page: http://www.elsevier.com/locate/agwat

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    1. Gardenas, A.I. & Hopmans, J.W. & Hanson, B.R. & Simunek, J., 2005. "Two-dimensional modeling of nitrate leaching for various fertigation scenarios under micro-irrigation," Agricultural Water Management, Elsevier, vol. 74(3), pages 219-242, June.
    2. Wang, Feng-Xin & Kang, Yaohu & Liu, Shi-Ping, 2006. "Effects of drip irrigation frequency on soil wetting pattern and potato growth in North China Plain," Agricultural Water Management, Elsevier, vol. 79(3), pages 248-264, February.
    3. Batchelor, Charles & Lovell, Christopher & Murata, Monica, 1996. "Simple microirrigation techniques for improving irrigation efficiency on vegetable gardens," Agricultural Water Management, Elsevier, vol. 32(1), pages 37-48, November.
    4. Singh, D.K. & Rajput, T.B.S. & Singh, D.K. & Sikarwar, H.S. & Sahoo, R.N. & Ahmad, T., 2006. "Simulation of soil wetting pattern with subsurface drip irrigation from line source," Agricultural Water Management, Elsevier, vol. 83(1-2), pages 130-134, May.
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