✦ LIBER ✦

On Penman's equation for estimating regional evaporation

✍ Scribed by A. S. Thom; H. R. Oliver

Publisher: John Wiley and Sons
Year: 1977
Tongue: English
Weight: 799 KB
Volume: 103
Category: Article
ISSN: 0035-9009
DOI: 10.1002/qj.49710343610

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The form of Penman's evaporation equation most extensively applied in hydrometeorology is discussed. It is shown that this equation underemphasizes the importance of ventilation relative to radiation in maintaining regional evaporation. A generalized ventilation term is proposed and a modified equation for evaporation derived. This new equation is calibrated to give the same annual total for short vegetation as Penman's original version. It predicts both an enhancement of winter evaporation at the expense of summer evaporation and a significant increase in annual total evaporation with vegetation size, especially in regions of frequent substantial rainfall.

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