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| 3rd ERS SYMPOSIUM Florence 97 - Abstracts and Papers | |||
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| Landslide monitoring in south of France with tandem data | |||
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Landslide monitoring in south of France with tandem data
| Fruneau Bénédicte | LPMG, Université de Marne-la-Vallée 2 rue de la Butte Verte 93166 Noisy-le-Grand Cedex, France
fruneau@ipgp.jussieu.fr | |
| Delacourt Christophe | Institut de Physique du Globe
Département Etudes Spatiales 4 place Jussieu 75252 Paris Cedex 05, France delac@ipgp.jussieu.fr http://www.ipgp.jussieu.fr | |
| Achache José | BRGM, Direction de la Recherche 3 av. C. Guillemin, BP 6009 45060 Orléans Cedex 2, France j.achache@dr.brgm.fr | |
| Carnec Claudie | BRGM, Direction de la Recherche 3 av. C. Guillemin, BP 6009 45060 Orléans Cedex 2, France c.carnec@dr.brgm.fr |
Abstract
-
- Our aim is to study movements of small spatial
extend with SAR differential interferometry. We focus on two landslides
in moutaneaous context. The two sites of interest are located
in southern France. The choice of the first one, the Saint-Etienne-de-Tinée
landslide, is based on the acquired experience of differential
interferometry on this site, which allowed us to obtain a global
map of the displacements, to compare them whith those measured
on ground, as well as to model the deformation field. This study
was carried out with images acquired during the Commissioning
Phase of ERS-1.
- The second site, the landslide of Séchilienne,
near Grenoble, threatens an highly frequented road in the Alps.
- For both sites, the tandem mission avoids
the incompatibility between the dynamic of the movements and the
actual standard orbit cycles of 35 days : they offer the opportunity
to pursue studies of sites for which displacements are too high
to be observed on a so large time-scale.
- We built six differential interferograms
on the Saint-Etienne-de-Tinée landslide, with images acquired
during 1995 and 1996. On these interferograms, we observe a discontinuity
of phase with respect to the stable zone. Some of them clearly
evidence a small block at the upper east part of the landslide,
that we already detected in the previous interferograms. It confirms
the high values of displacements of this block, and then its instability.
We compare the displacements with ground measurements obtained
with a network of 50 laser targets deployed on the site. The study
of the Séchilienn
Abstract
- Our aim is to study movements of small spatial extend with SAR differential interferometry. We focus on two landslides in moutaneaous context. The two sites of interest are located in southern France. The choice of the first one, the Saint-Etienne-de-Tinée landslide, is based on the acquired experience of differential interferometry on this site, which allowed us to obtain a global map of the displacements, to compare them whith those measured on ground, as well as to model the deformation field. This study was carried out with images acquired during the Commissioning Phase of ERS-1.
- The second site, the landslide of Séchilienne,
near Grenoble, threatens an highly frequented road in the Alps.
- For both sites, the tandem mission avoids the incompatibility between the dynamic of the movements and the actual standard orbit cycles of 35 days : they offer the opportunity to pursue studies of sites for which displacements are too high to be observed on a so large time-scale.
- We built six differential interferograms on the Saint-Etienne-de-Tinée landslide, with images acquired during 1995 and 1996. On these interferograms, we observe a discontinuity of phase with respect to the stable zone. Some of them clearly evidence a small block at the upper east part of the landslide, that we already detected in the previous interferograms. It confirms the high values of displacements of this block, and then its instability. We compare the displacements with ground measurements obtained with a network of 50 laser targets deployed on the site. The study of the Séchilienn
- For both sites, the tandem mission avoids the incompatibility between the dynamic of the movements and the actual standard orbit cycles of 35 days : they offer the opportunity to pursue studies of sites for which displacements are too high to be observed on a so large time-scale.