Infiltration and water extraction from trickle irrigation source: the effective hemisphere model. Academic Article uri icon

abstract

  • Infiltration from a point trickle source in the presence of water extraction is investigated using an approximate hemispherical model. Analytic expressions for the position of the wetting front are derived. In the short-time limit the wetting front follows a simple t 1/3 dependence. The rate of advance of the wetting front depends on a single soil parameter, closely related to the saturated water content. At larger times the effects of water extraction modify the solution to an exponential approach to a limiting radius, which is determined by the balance between the competing discharge and extraction processes. The results are consistent with available experimental data and with predictions of various existing models.

publication date

  • January 1, 1986