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Water 2017, 9(9), 698;

Incorporating the Vadose Zone into the Budyko Framework

Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720-3114, USA
Earth & Environmental Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
Received: 27 June 2017 / Revised: 15 August 2017 / Accepted: 30 August 2017 / Published: 13 September 2017
(This article belongs to the Special Issue Water and Solute Transport in Vadose Zone)
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The Budyko framework provides a quantitative description of long-term average annual evapotranspiration at catchment scales in terms of macro-climatic variables. This framework, however, makes no reference to the vadose zone because it neglects changes in ubsurface storage in the catchment water balance. Recent studies have shown clearly that vadose-zone water storage cannot be neglected at sub-catchment or sub-annual space and time scales, resulting in numerous model attempts to extend the original Budyko framework to incorporate the full water balance equation. Here we apply the approach taken in a companion paper on the original Budyko framework to show that it can be generalized rigorously to include changes in vadose-zone water storage in a manner that is both parsimonious in hypotheses and broad in scope. View Full-Text
Keywords: Budyko equation; evapotranspiration; catchment hydrology; vadose zone; water balance Budyko equation; evapotranspiration; catchment hydrology; vadose zone; water balance
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Sposito, G. Incorporating the Vadose Zone into the Budyko Framework. Water 2017, 9, 698.

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