Simple download service (Atom) of the dataset: Mapping of the hay removal of clays in the commune of Lamaguère (Gers)

The mapping of the hay removal of clays in the commune of Lamaguère 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.该黏土胀缩灾害制图提取自法国地质矿业研究局（BRGM）编制的热尔省（Gers）区域制图，覆盖热尔省拉马盖尔公社（Lamaguère）范围。该制图为黏土层胀缩现象发生概率的分区图。法国地质矿业研究局（BRGM）最初依据纯物理准则，基于该省地质图编制了易发性分区图，编制过程中针对各地质构造，充分考虑了以下三项因素： — 地质构造内的黏土物质占比（岩性分析）； — 黏土相中风积矿物占比（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层，最终的灾害等级由上述得到的易发性等级结合膨胀灾害密度，按每100 km²实际出露的城市化地表进行归一化后确定。