HR: 16:15h
AN: H42M-02    [PDF]
TI: Evaluation of canopy transfer models for growing vegetation using in-canopy profile measurements
AU: * Cahill, A T
EM: tcahill@civilmail.tamu.edu
AF: Texas A&M University, Dept. of Civil Engineering, College Station, TX 77843
AU: Kustas, W
EM: bkustas@hydrolab.arsusda.gov
AF: USDA-ARS, Hydrology and Remote Sensing Lab 10300 Baltimore Avenue Bldg. 007 BARC-West, Beltsville, MD 20705
AB: Estimates of the roughness lengths and the in-canopy transfer of momentum and sensible and latent heat are needed for any determination of the fluxes from a vegetated area. We use in-canopy measurements of the wind and temperature profiles taken with needle anemometers in acorn crop to test models of the in-canopy transfer. Profile measurements were taken during the course of the day, and over a larger portion of the growing season, as the corn grows from approximately 80cm to above 2 m. The changes in canopy height and closure led to a varying relationship of roughness height and displacement height, and affected the choice of best model for the in-canopy sensible and latent heat transfer. The implications of our measurements and analysis for estimating fluxes from a larger-scale area are explored.
DE: 1818 Evapotranspiration
DE: 1878 Water/energy interactions
SC: Hydrology [H]
MN: 2003 Fall Meeting