Dataset Direct Download Service (WFS): Map of the haea removal swelling of clays on the commune of Montégut (Gers)

The mapping of the hay removal of clays in the commune of Montégut 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矿业研究局（BRGM）编制的热尔省区域地质图，内容为该省蒙泰居公社范围内的黏土胀缩相关图件。该图件为热尔省黏土土壤胀缩现象发生概率的分区区划图。 此前，BRGM依托该省地质图，基于纯物理准则率先编制了易发性区划图。编制过程中，针对每一类地质单元，均综合考量了以下三项因素： — 地质单元内黏土物质的占比（岩性分析）； — 黏土相中膨胀性矿物的占比（矿物组成分析）； — 岩土体的土工特性。 针对已识别的各黏土地质单元，最终的灾害等级由前述易发性等级结合灾害性胀缩密度计算得出，该密度以每100km²实际出露的城市化地表面积为基准进行统计。