Creation and information of a gis “Ground Movements” atlas in the Lot-and-Garonne region (France)

Desport R.¹, Flouest N.²

1University of Bordeaux 3 egid Institute, Pessac, France; 2 lrpc, Bordeaux, France

romain.desport@hotmail.fr

This six months internship had for main goal to list, locate and characterize the major ground movements that occurred in the region of Lot-and-Garonne and then to integrate the data into an inventory using MapInfo software.

Indeed, this region is really affected by varied and complex ground movements. The LRPC (Bridges-and-Causeways Regional Laboratory) of Bordeaux has realized these last 40 years numerous studies or interventions on the subject.

A bibliographical study of the LRPC archives in Bordeaux allowed to define a movements typology in the order to offer a synthesis of geotechnical characteristics at the scale of this region.

The ground movements concerned by this regional inventory are the phenomena of landslides (superficial and deep slides, bank erosion), falls (stones, blocks and heap of rocks) and collapses (soil compaction, sinkhole, subsidence).

The creation of this Lot-and-Garonne “ground movements” atlas, the information of data in the BRGM (Mining and Geological Research office) Ground Movements Database about the Dordogne region as well as all others missions realized during this internship were done in the aim to improve the consideration of " natural hazards " within the framework of the sustainable territory development.

Fig. Map of the Lot-and-Garonne « Ground movements » localization

References :

1. LRPC archives for the Lot-and-Garonne atlas information.

2. Ministry of Ecology and Sustainable Development , Major natural hazards information file abstract of « The ground movements » , September 2004.

3. General guide of the Environment and Territory Planning Ministry and the Equipment, Transport and Housing Ministry « Prevention Plans about predictable Natural Hazards (PPNH) » , the French Documentation.

4. Methodological guide of the Ecology and Sustainable Development Ministry , « Schematic of risks itinerary » , Research Operation 11M052 : rock risks ,.

5. BRGM , « Establishing Prevention Plan for Natural Hazards of differential soil movement risk due to shrinkage and swelling of clays » RP-51995-FR (Lot-and-Garonne) , February 2003.

6. Pomerol, C. Lagabrielle, Y. and Renard, M. , « Geology Elements » , Dunod , 13° edition.

7. Foucault, A. and Raoult, J-F. , « Geology Dictionnary » , Dunod , 6° edition.

8. XXVI^e International Geological Congress , Geological risks « Ground movements » , LRPC Newsletter , Environnement and Living Area Ministry , Transports Ministry , January 1981

9. Costet, J. and Sanglerat, G. , « Practical courses on Soil Mechanics» , Dunod.

10. Publication of all major natural and technological hazards maps by the Ministry of Ecology, Energy, Sustainable Development and Spatial Planning

http://cartorisque.prim.net/index.html

11. BRGM database :

http://www.bdmvt.net/

12. Purchasers and tenants risks information in Lot-and-Garonne :

http://www.lot-et-garonne.pref.gouv.fr/1-8931-Information-des-acquereurs-et-des-locataires-sur-les-risques.php

13. Natural hazards glossary :

http://www.vol.be.ch/site/fr/naturgefahren/naturgefahren-a-z.htm

14. Major hazards prevention portal :

http://www.prim.net/cgi_bin/citoyen/macommune/bddrm_detail_commune.php?insee=47157

15. National Assembly Report about landslides and rockfalls :

http://www.assemblee-nationale.fr/rap-oecst/risque95/titre2.asp

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