Preprints
https://doi.org/10.5194/egusphere-2022-860
https://doi.org/10.5194/egusphere-2022-860
 
27 Sep 2022
27 Sep 2022
Status: this preprint is open for discussion.

Brief communication: Mountain permafrost acts as an aquiclude during an infiltration experiment monitored with ERT time-lapse measurements

Mirko Pavoni1, Jacopo Boaga1, Alberto Carrera2, Giulia Zuecco3, Luca Carturan3, and Matteo Zumiani4 Mirko Pavoni et al.
  • 1Department of Geosciences, University of Padova, Padua, Italy
  • 2Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padova, Legnaro (PD), Italy
  • 3Department of Land, Environment, Agriculture and Forestry, University of Padova, Legnaro (PD), Italy
  • 4Servizio Geologico, Provincia Autonoma di Trento, Italy

Abstract. Continuous frozen layers within the subsoil are generally assumed to act as aquicludes or aquitards. So far, this behavior has been mainly defined analyzing the geochemical characteristics of spring waters. In this work, for the first time, we experimentally confirmed this assumption by executing an infiltration test in a rock glacier of the Southern Alps, Italy. Time-lapse electrical tomography (ERT) technique was adopted to monitor the infiltration of a huge amount of water spilled on the surface of the rock glacier. 24 hours ERT monitoring highlighted that the injected water was not able to infiltrate into the underlying frozen layer.

Mirko Pavoni et al.

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-860', Anonymous Referee #1, 23 Oct 2022 reply
    • AC1: 'Reply on RC1', Mirko Pavoni, 31 Oct 2022 reply

Mirko Pavoni et al.

Mirko Pavoni et al.

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Short summary
In the last decades, geochemical investigations at the spring of rock glaciers have been used to estimate their drainage processes, and the continuous frozen layer is typically considered to act as an aquiclude. In this work, we evaluated the hydraulic behavior of a mountain permafrost site by executing a geophysical monitoring experiment. Several hundred liters of water have been injected into the frozen subsoil and geoelectrical measurements have been performed to define the water flow.