Simple download service (Atom) of the dataset: N_ZONE_ALEA_PPRN_20140150_S_032

The mapping of the hay removal of clays in the commune of Sauveterre 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.本数据集所涉热尔省索沃特雷公社黏土胀缩灾害分布图件，提取自法国地质矿业研究局（BRGM）编制的该省专项地质图件。该分布图件为黏土胀缩现象发生概率的分区图。法国地质矿业研究局最初以该省地质图为基础，依据纯物理准则编制敏感性分区图，编制过程中针对各赋存地层，结合以下因素开展解译：— 地层内黏土物质占比（岩相分析）；— 黏土组分中膨胀性矿物占比（矿物组成分析）；— 岩土体的工程力学特性。针对每一处已识别的黏土地层，最终灾害等级由前述敏感性等级与有害胀缩事件密度共同确定，该密度以每100平方千米实际出露的城市化地表面积为统计基准。