We developed a three-dimensional mechanistic model describing soil-atmosphere energy exchange and water transport in an effort to account for the effect of time-varying and space-variable shading on evaporation from a bare soil. During the course of a day, the effect of a canopylike shading body was to create a west-to-east shaded band in which soil surface temperature and evaporation were reduced (in comparison with a continuously sunlit surface) and soil moisture was enhanced. The possibilities inherent in the use of orthographic fisheye view factors are demonstrated.
(C) Williams & Wilkins 1983. All Rights Reserved.