Mapping of the hay removal of clays in the municipality of Pujaudran (Gers)

The mapping of the hay removal of clays in the municipality of Pujaudran 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.本数据集提取自法国热尔省普若德朗（Pujaudran）市镇范围内的黏土胀缩现象区划图，该图源自BRGM（Bureau de Recherches Géologiques et Minières，法国地质与矿业研究局）编制的省级地质制图成果。该区划图为黏土胀缩现象发生概率的分区成果。BRGM首先基于纯物理准则，以该省地质图为基础编制了敏感性分区图，编制过程中针对各地质单元综合考量了以下因素： — 地质单元内黏土物质占比（岩性分析）； — 黏土相内膨胀性矿物占比（矿物组成分析）； — 岩土体的土工力学性状。 针对已识别的各黏土地质单元，最终灾害等级由前述敏感性等级结合灾害性胀缩密度确定，该密度以每100平方公里实际出露的城市化地表为统计基准。