#IMC: September 14 - 18 2025

Traces of an englacial reservoir? First results from a helicopter-borne GPR survey at Glacier de la Bonne Pierre, France

Assigned Session: #AGM28: Generic Meeting Session

Abstract ID: 28.7421 | Accepted as Poster | Requested as: Poster | 2025-02-28 12:45 - 14:15 | Ágnes‐Heller‐Haus/Small Lecture Room

Daniel Farinotti (1)
Ilaria, Santin (2, 3); Raphael, Moser (2, 3); Christophe, Ogier (2, 3); Huw, Horgan (2, 3)

(1) ETH Zurich, Hönggerbergring 26, 8093 Zürich, CH
(2) ETH Zurich
(3) WSL Sion

Categories: Glacial Hydrology, Hazards, Monitoring, Morphodynamic
Keywords: GPR survey, Englacial water reservoir, Signal interpretation

Categories: Glacial Hydrology, Hazards, Monitoring, Morphodynamic
Keywords: GPR survey, Englacial water reservoir, Signal interpretation

Abstract
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Following the severe damage to the mountain settlement of La Bérarde (French Alps), which was struck by a flood and debris flow in June 2024, we conducted a helicopter-based GPR survey of the upstream Glacier de la Bonne Pierre. The survey aimed to investigate whether the glacier—particularly the water stored within it—may have influenced the dynamics of the flood.

Here, we present preliminary results from an extensive GPR survey conducted in November 2024 using the Airborne Ice Radar of ETH Zürich (AIRETH). Notably, we discuss peculiar signal reflections observed in the acquired radargrams. Whether the features can actually be interpreted as traces of an englacial reservoir is not clear yet, and we thus hope that AGM can provide a platform for discussing different interpretations.

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