Application of new solutions for groundwater mounding to irrigation mosaics

F.J. Cook, J.H. Knight, Emmanuel Xevi, Zahra Paydar, Keith Bristow

Research output: Book chapter/Published conference paperConference paper

1 Citation (Scopus)
41 Downloads (Pure)

Abstract

Irrigation mosaics, consisting of patches of irrigated area, may offer advantages when compared to traditional contiguous irrigation schemes (Figure 1). Irrigation mosaics could reduce water table rise, water logging and salinisation associated with large irrigation schemes. The water table mound that builds up under an irrigated patch due to increased recharge is examined using both a new analytical solution and a numerical solution. The rise in water table is examined in both dimensional and nondimensional parameters with the analytical solution. This solution was developed by Cook etal. (2007a) and is computationally efficient. The use of non-dimensional variables allow us to examine a very large range of possible solutions.A solution for water table rise with a square array of circular irrigation patches is developed and used to examine these arrays. These results are supplemented by numerical simulations using MODFLOW (McDonald & Harbaugh, 1988). The MODFLOW calculations allow for periodic recharge and also irrigation arrays that are limited in spatial extent.Results show that the maximum water table rise(in the centre of the irrigated patch) is strongly dependent on the size of the irrigation patch. This water table rise is linear with time initially but the rate of rise reduces with time as the mound spreads. The irrigation arrays show that if mosaics are to be introduced that the size and spacing will have a large effect on the maximum water table rise. The numerical results show that periodic recharge will result in a periodic time rise of the water table and that this is likely to approach the water table rise calculated with an average steady recharge rate over longer time.Results suggest that irrigation mosaics of correct size and spacing could reduce water table rises relative to traditional irrigation systems while still irrigating the same total area.
Original languageEnglish
Title of host publicationLand, Water and Environmental Management
Subtitle of host publicationIntegrated Systems for Sustainability
EditorsL. Oxley, D. Kulasiri
Place of PublicationChristchurch, New Zealand
PublisherModelling and Simulation Society of Australia and New Zealand
Pages1403-1409
Number of pages7
ISBN (Electronic)9780975840030
Publication statusPublished - 2007
EventInternational Congress on Modelling and Simulation (MODSIM) - Christchurch, New Zealand
Duration: 10 Dec 200713 Dec 2007

Conference

ConferenceInternational Congress on Modelling and Simulation (MODSIM)
CountryNew Zealand
CityChristchurch
Period10/12/0713/12/07

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  • Cite this

    Cook, F. J., Knight, J. H., Xevi, E., Paydar, Z., & Bristow, K. (2007). Application of new solutions for groundwater mounding to irrigation mosaics. In L. Oxley, & D. Kulasiri (Eds.), Land, Water and Environmental Management: Integrated Systems for Sustainability (pp. 1403-1409). Modelling and Simulation Society of Australia and New Zealand.