Simple download service (Atom) of the dataset: Map of the haea removal of clays in the commune of Saint-Germier (Gers)

The mapping of the hay removal of clays in the commune of Saint-Germier 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.

热尔省圣热米耶公社黏土胀缩相关图件提取自法国地质矿业研究局（BRGM）发布的该省官方地质图件。该图为黏土胀缩现象发生概率的分区图。法国地质矿业研究局（BRGM）首先依据纯物理准则，基于该省地质图编制了易发性图，编图过程中针对每个地质单元，综合考量了以下因素：
— 地层内黏土物质占比（岩性分析）；
— 黏土相中膨胀矿物占比（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层，最终的灾害等级由上述易发性等级结合以每100平方公里实际出露城市化地表面积为基准的灾害性胀缩密度计算得到。