Simple download service (Atom) of the dataset: Map of the haea removal of clays on the commune of Miradoux (Gers)

The mapping of the hay removal of clays in the commune of Miradoux 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地质矿产调查局（BRGM）制作的热尔省区域地质图，内容为热尔省米拉杜（Miradoux）市镇范围内的黏土胀缩性分布图。该分布图为胀缩性黏土现象发生概率的分区图。法国地质矿产调查局（BRGM）最初基于纯物理准则，以该省的地质图为基础编制了敏感性分区图，编制过程中针对每一个地质单元，综合考量了以下因素：
— 该单元内黏土物质的占比（岩相分析）；
— 黏土相中风成矿物的占比（矿物组成分析）；
— 该物质的岩土工程特性。
针对已识别的每一处黏土单元，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基准进行统计。