Identifying a soil hydraulic parameterisation from on-ground GPR time lapse measurements of a pumping experiment

Abstract

Please find the reply to the anonymous referee #2 attached as supplement and note that a revised version of the manuscript has been uploaded as a separate author comment. Please also note the supplement to this comment: https://www.hydrol-earth-syst-sci-discuss.net/hess-2017-538/hess-2017-538-AC2-supplement.pdf Interactive comment on Hydrol. Earth Syst. Sci. Discuss., https://doi.

The Electromagnetic Induction or “Slingram” Method

“…For example, the van Genuchten formulations have certain advantages for numerical simulations due to their differentiability. However, as has for example been shown by Dagenbach et al (2012), the simplified van Genuchten parameterization is not necessarily suitable for describing the capillary fringe response in a sandy material to a Ground-Penetrating Radar signal. In this case either a Brooks-Corey type model or an equivalently formulated full van Genuchten parameterization has to be used.…”

“…These experiments were also the foundation for the diploma thesis of Dagenbach (2012), who performed a detailed numerical analysis of the GPR response to the transition zone above the capillary fringe. Comparing the time-lapse measurements acquired during the experiments to the results of numerical simulations, an appropriate soil hydraulic parametrization has been identified by Dagenbach et al (2012). Keicher (2013) carried out a series of GPR measurements at the ASSESS site for detailed investigation of the precision and accuracy of our instruments.…”