Author Topic: Unanswered questions on the Budyko framework  (Read 239 times)

Pankaj Dey

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Unanswered questions on the Budyko framework
« on: November 05, 2020, 09:17:04 AM »
Landscapes and their hydrology are complex and sui generis. As a result, few theories exist that (without calibration) usefully describe or predict catchment-scale hydrological behavior [Beven, 2000; Sivapalan, 2005]. The Budyko hypothesis [Budyko, 1951; 1974] is a rare exception: its simple parameterization of how aridity (the ratio of long-term mean precipitation to long-term mean potential evapotranspiration) controls the long-term mean partitioning of precipitation into streamflow and evapotranspiration captures the behavior of many catchments around the world. In recent years, the Budyko framework has increasingly being used to interpret and predict (often non-stationary) water balances. While uses of the framework have become diverse and widespread, they are typically founded in common principles that rely on largely untested assumptions and strongly relate to questions for which no clear answers exist. Therefore, we believe that answering several basic questions around the Budyko framework can strengthen (or invalidate) many old, recent, and future applications. We realize that similar questions have been contemplated by others, but we hope that presenting them in the following manner may prove useful.