Calibration of an Evapotranspiration Model Using Eddy Correlation Methods

by Michael A. Kizer, Oklahoma State Univ, Stillwater, OK, USA,
Ronald L. Elliott, Oklahoma State Univ, Stillwater, OK, USA,
John F. Stone, Oklahoma State Univ, Stillwater, OK, USA,

Document Type: Proceeding Paper

Part of: Steel Structures


An evapotranspiration (ET) prediction model was developed by calibrating the H. L. Penman equation for an alfalfa reference crop in the southwestern Oklahoma region. Evaporative flux for the calibration was determined by using eddy correlation equipment and applying the surface energy balance equation. Initial closure of the energy balance equation was compatible with results obtained by other researchers, but deteriorated later. Investigation found a fault in the krypton hygrometer. Consequently, the residual equivalent of latent energy from the energy balance equation was used for the calibration procedure. The calibrated model produced ET predictions which satisfactorily matched independent data when used with hourly weather data.

Subject Headings: Calibration | Evapotranspiration | Eddy (fluid dynamics) | Correlation | Mathematical models | Vegetation | Crops | Hydrologic data | Oklahoma | United States

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