Estimation of the diurnal variation of potential evaporation from a wet bare soil surface


Journal Article

Potential evaporation from a wet bare soil field was measured with a large sensitive weighing lysimeter on a 20 min time step for 5 days at Davis, California. The diurnal evaporation rate modeled with the Penman-Brutsaert model for potential evaporation with atmospheric stability corrections resulted in the best description of the measured fluxes. The Priestley-Taylor model was accurate for short intervals except when conditions of minimal advection were exceeded during the day. It was noted that the Priestley-Taylor formulation with α = 1.26 performs best under unstable atmospheric conditions. During stable conditions, the value of α = 1.26 underpredicts the measured potential evaporation. The advection-aridity model for actual evaporation based on the Bouchet complementary relationship was studied. Strong advection explains the tendency found in other experimental studies to underpredict daily potential evaporation. A methodology to account for the excess advection is discussed in the complementary model, and the flux predictions were equivalent to the Penman-Brutsaert formulation for wet surfaces. © 1992.

Full Text

Duke Authors

Cited Authors

  • Parlange, MB; Katul, GG

Published Date

  • January 1, 1992

Published In

Volume / Issue

  • 132 / 1-4

Start / End Page

  • 71 - 89

International Standard Serial Number (ISSN)

  • 0022-1694

Digital Object Identifier (DOI)

  • 10.1016/0022-1694(92)90173-S

Citation Source

  • Scopus