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Applicability of temperature profile techniques for estimating recharge fluxes through the vadose zone

Aquifer recharge is difficult to evaluate, and the use of multiple methods is recommended. Heat can easily and cheaply be measured in soils and could represent a valuable tool for recharge estimation. In this paper, the applicability of temperature profile techniques for estimating diffuse
recharge fluxes in the vadose zone was investigated using a simple numerical model. The results suggest that the thermal signal resulting from diffuse recharge is small and difficult to distinguish from other heat sources, and that analytical approaches are probably not well suited for diffuse
recharge estimation from temperature measurements in most cases.

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