Experimental analysis of groundwater flow through a landslide slip surface using natural and artificial water chemical tracers.

Stéphane Binet (1, 2) , Herve Jomard (3) , Thomas Lebourg (3) , Yves Guglielmi (3) , Emmanuel Tric (3) , Catherine Bertrand (4) , Jacques Mudry (4)

1 GéOSCIENCES - Déformation écoulement Transfert, Géosciences
2 ISTO - Institut des Sciences de la Terre d'Orléans
3 GEOAZUR 6526 - Géoazur
4 LCE - Laboratoire Chrono-environnement (UMR 6249)

Artificial and natural tracer tests combined with high accurate electronic distancemeter measurements are conducted on a small landslide with a well known slip surface geometry. Outflow yields and chemical contents are monitored for all the experiment duration and they analyzed to estimate the slip surface hydraulic parameters. The main result is that the slip surface acts as a drain for groundwater flows that evacuates interstitial pressures in the slope and brings the sliding mass to be more stable one.

Domaines: Hydrologie; Milieux et Changements globaux

Stéphane Binet, Herve Jomard, Thomas Lebourg, Yves Guglielmi, Emmanuel Tric, et al.. Experimental analysis of groundwater flow through a landslide slip surface using natural and artificial water chemical tracers.. Hydrological Processes, 2007, 21 (25), pp.3463-3472. ⟨10.1002/hyp.6579⟩. ⟨hal-00361352⟩