Map of the haea removal of clays in the municipality of Auradé (Gers)

The mapping of the hay removal of clays in the commune of Auradé in the department of Gers 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.本数据集取自法国地质与矿业研究局（BRGM）编制的热尔省（Gers）域制图成果，对应热尔省奥拉德镇（Auradé）辖区内黏土胀缩现象概率分区制图。该成果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）最初基于纯物理准则，依托该省地质图编制了胀缩易发性分区图，编制过程中针对各地质地层考量了以下三类因素： — 地层内黏土物质的占比（岩性分析）； — 黏土相中膨胀性矿物的占比（矿物组成分析）； — 岩土体的工程力学特性。 针对已识别的全部黏土地层，最终的危险等级由前述得到的易发性等级，结合灾害性胀缩密度（以每100平方公里实际出露城市化地表为基准进行归一化）共同确定。