Abstract
A simple methodology to assess spatially the average annual water balance in the Region of Andalusia is presented, taking advantage of previously produced maps of average annual precipitation (P) and reference crop evapotranspiration (ET o ). Using a simple bucket model, daily series of actual evapotranspiration and total runoff were calculated, from which average annual actual evapotranspiration, E, and total runoff, Q, were obtained. Considering average annual values, the water balance problem of a homogeneous land area reduces to the question: How is P split up between E and Q? Budyko’s empirical relationship offers an answer to this question, relating the index of dryness, R=ET o /P, to the ratio between E and P. Similar relations are used to transform a map of R into first estimates of E and Q. These maps are consecutively used as local mean maps in simple kriging with varying local means (SKlm) or as an external drift variable in kriging with an external drift (KED). The cross-validation statistics show larger errors for the Q estimates, due to its skewed distribution, but only small differences are observed between SKlm and KED. Finally, block kriging is used to produce maps of E and Q with both methods.
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Vanderlinden, K., Giráldez, J.V., Van Meirvenne, M. (2004). A Spatial Assessment of the Average Annual Water Balance in Andalucia. In: Sanchez-Vila, X., Carrera, J., Gómez-Hernández, J.J. (eds) geoENV IV — Geostatistics for Environmental Applications. Quantitative Geology and Geostatistics, vol 13. Springer, Dordrecht. https://doi.org/10.1007/1-4020-2115-1_13
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DOI: https://doi.org/10.1007/1-4020-2115-1_13
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