Dataset Direct Download Service (WFS): N_ZONE_ALEA_PPRN_20140318_S_032

The mapping of the hay removal of clays in the commune of Saint-Pierre-d’Aubézies in the Gers department is extracted from the departmental mapping from the BRGM. This mapping is a zoning of the probability of occurrence of the phenomenon of shrink-inflating of clay soils. A susceptibility map was first drawn up 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 clay material within the formation (lithic analysis); — the proportion of blowing minerals in the clay phase (mineralogical composition); — the geotechnical behavior of the material. For each of the clay formations identified, the hazard level is ultimately the result of the level of susceptibility thus obtained with the density of sinister swelling, reported to 100 km² of actual urbanised outcropping surface.本数据集所包含的热尔省圣皮埃尔多贝齐公社黏土胀缩现象相关填图成果，源自法国地质与矿业研究局（Bureau de Recherches Géologiques et Minières, BRGM）的省级填图数据。该填图为黏土土壤胀缩现象发生概率的分区图。法国地质与矿业研究局（BRGM）首先依托该省的地质填图，基于纯物理准则绘制了地质灾害易发性图；该填图的解译需针对每个地质单元考量以下因素：— 地层内黏土物质占比（岩性分析）；— 黏土组分中膨胀性矿物占比（矿物组成分析）；— 该物质的岩土工程特性。针对每一个已识别的黏土地层，最终的灾害等级由前述得到的易发性等级结合灾害性膨胀密度综合确定，该密度以每100平方千米实际出露的城市化地表为统计基准。