Map visualisation service (WMS) of the dataset: N_ZONE_ALEA_PPRN_20140462_S_032
Description
The cartography of the hazard removal swelling of the clays in the commune of Vergoignan in the department of Gers is extracted from the departmental cartography from the BRGM. This mapping constitutes a zoning of the probability of occurrence of the phenomenon of shrinkage-swelling of clay soils. A susceptibility map was first established on the basis of purely physical criteria by the BRGM from the geological maps of the department, which were interpreted taking into account the following factors for each geological formation:
- the proportion of clayey material within the formation (lithologic analysis);
- the proportion of swelling minerals in the clay phase (mineralogical composition);
- the geotechnical behaviour of the material.
For each of the clay formations identified, the hazard level is ultimately the result of the susceptibility level thus obtained with the density of swelling shrinkage, related to 100 km2 of outcrop area actually urbanized.
Resources
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file:///usr/verticles/WxsUrlservice |