Map of the haea removal of clays in the commune of Saint-Arroman (Gers)

The mapping of the hay removal of clays in the commune of Saint-Arroman 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.该数据集涵盖热尔省圣阿尔罗曼公社内黏土胀缩现象的图件，其数据源自法国地质矿产调查局（Bureau de Recherches Géologiques et Minières，BRGM）编制的该省区域图件。该图件为黏土胀缩现象发生概率的分区图。法国地质矿产调查局（BRGM）最初以该省地质图为基础，依据纯物理标准编制了敏感性图（susceptibility map），编制过程中针对每个地质单元，综合考量了以下影响因素： — 地质单元内黏土物质占比（岩相分析）； — 黏土相内膨胀性矿物占比（矿物组成分析）； — 该物质的岩土工程特性。针对已识别的各黏土地质单元，最终的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平方千米实际出露的城市化地表面积为统计基准。