Dataset Direct Download Service (WFS): Map of the haea removal of clays in the commune of Saint-Soulan (Gers)

The mapping of the hay removal of clays in the commune of Saint-Soulan 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（Bureau de Recherches Géologiques et Minières，BRGM）编制的热尔省（Gers）域地质制图，该制图针对热尔省圣苏朗公社（Saint-Soulan）的胀缩性黏土展开。该制图为黏土土壤胀缩现象发生概率的分区图。法国地质矿产调查局首先依据省域地质图，以纯物理标准编制了敏感性分区图，编制过程中针对各地质地层，综合考量了以下三类因素：
— 地层内黏土物质占比（岩性分析）；
— 黏土相中膨润矿物（blowing minerals）占比（矿物组成）；
— 岩土体的工程力学特性。
针对已识别的各黏土地层，最终的灾害等级由前述敏感性等级与灾害性胀缩密度（以每100平方公里实际出露的城市化地表为基准）共同确定。