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Computing the flux of moisture from net radiation and soil wetness

✍ Scribed by Dario Camuffo; Adriana Bernardi; Pietro Bacci

Publisher
Springer
Year
1982
Tongue
English
Weight
448 KB
Volume
22
Category
Article
ISSN
0006-8314

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✦ Synopsis

A study has been made of the time evolution of the flux of moisture E over grassland. The parameterization ofE has been examined in order to formulate an equation depending on the net radiation flux and on bulk parameters which depend on the daily average meteorological situation and soil conditions. In particular the gradient of soil moisture has been recognized as playing a fundamental role in the time evolution ofE(t). A time-dependent equation is proposed to compute in a statistical sense the irrigation needs or to forecast the hourly values ofE(t), the maximum value Ea and the time at which this maximum happens. D. CAMUFFO ET AL. density of dry soil water amount per unit volume of soil Priestley-Taylor coefficient Bowen ratio H/LE psychrometric constant = 0.66 mbar "C ' at T = 20 "C and p = 1000 mbar solar declination slope of the saturation pressure versus the temperature, i.e., = de,,,/dT latitude flux of net radiation per unit time and unit surface maximum amount of 0,.

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