Dataset Direct Download Service (WFS): Mapping of the haea removal of clays in the commune of Castillon-Savès (Gers)

The mapping of the hay removal of clays in the commune of Castillon-Savès in the department of Gers is extracted from the departmental mapping derived 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与矿产研究局（BRGM）编制的热尔省省域制图成果，内容为热尔省卡斯蒂永-萨韦市镇范围内黏土干草清除相关的制图。该制图为黏土土壤胀缩现象发生概率的区划图。 法国地质与矿产研究局（BRGM）首先依托该省地质图，基于纯物理准则编制了敏感性区划图，在编释各地质单元时需综合考虑以下影响因素： —— 地质单元内黏土组分占比（岩性分析）； —— 黏土相中风成矿物占比（矿物组成分析）； —— 岩土体的工程地质特性。 针对已识别的各黏土地质单元，最终危害等级由上述敏感性等级结合严重胀缩密度确定，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。