Simulation of the impact of agricultural management practices on chemical transport in macroporous soils

C. Ray, C. W. Boast, T. R. Ellsworth, A. J. Valocchi

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

A simulation model capable of describing preferential movement of water and pesticides in macroporous soils has been developed. The model assumes a bi-continuum, with flow and transport in and between each of two coexisting pore domains (matrix and macropore). In each pore domain, water flow is assumed to obey Richards' equation and chemical movement is assumed to obey the convection-dispersion equation. Interdomain transfer of water and chemicals occurs under pressure and concentration gradients. The model incorporates features such as root water extraction, rate-limited sorption and desorption, and first-order decay. The macropore volume fractions are allowed to vary with space to accommodate variabilities in soil properties. The model can represent two-dimensions, to simulate the impact of agricultural management practices, such as tillage, irrigation, cropping practice, and organic addition, on flow and transport.

Original languageEnglish (US)
Pages (from-to)1697-1707
Number of pages11
JournalTransactions of the American Society of Agricultural Engineers
Volume39
Issue number5
StatePublished - 1996
Externally publishedYes

Keywords

  • Chemical transport
  • Dual porosity
  • Finite elements
  • Macropore

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)

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