A Portable Bowen Ratio System for ET Measurementsby Lloyd W. Gay, Univ of Arizona, United States,
Document Type: Proceeding Paper
Part of: Planning Now for Irrigation and Drainage in the 21st Century
The AZET system developed at the University of Arizona is designed to measure evapotranspiration (ET) in arid zone environments, using the Bowen ratio model. The system consists of a set of specialized sensors with supports and signal cables, a data logger and microcomputer, and software to control the acquisition and analysis of the microclimate data. The key data for this model are precise estimates of the rather small gradients of air temperature and vapor. The basic approach is to approximate the gradients by measurements from two psychrometers positioned one above the other with a vertical separation of from 0.5 to 1.0 m and the lower psychrometer placed near the evaporating surface.
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