2-D Evaporation and Root Extraction in an FEM

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by Richard G. Allen, Utah State Univ, Logan, United States,
Wigdan I. Ahmad, Utah State Univ, Logan, United States,

Document Type: Proceeding Paper

Part of: Irrigation and Drainage: Saving a Threatened Resource—In Search of Solutions

Abstract: Two-dimensional processes of soil evaporation and moisture extraction by plant roots (horizontal and vertical) were incorporated into a saturated/unsaturated finite element model (UNSAT2) to predict two dimensional soil moisture profiles under a corn crop. Soil evaporation algorithms included microadvection of unused evaporative energy from dry soil areas toward areas of moist soil surfaces and diffusive evaporation from subsurface nodes.

Subject Headings: Two-dimensional models | Soil water | Evaporation | Finite element method | Computer models | Saturated soils | Vegetation | Crops |

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