Simple download service (Atom) of the dataset: N_ZONE_ALEA_PPRN_20140146_S_032

The mapping of the hay removal of clays in the municipality of Samaran 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.法国热尔省（Gers）萨马朗市（Samaran）的黏土胀缩灾害制图数据源自法国地质与矿业研究局（BRGM）的省级制图成果。该制图为黏土土壤胀缩现象发生概率的分区图。法国地质与矿业研究局（BRGM）最初依托该省地质图，基于纯物理标准编制了易感性图（susceptibility map），编制过程中针对每个地质构造，综合考量了以下因素： — 地质构造内的黏土物质占比（岩性分析）； — 黏土相中的膨胀性矿物占比（矿物组成）； — 材料的岩土工程特性。 针对已识别的每一处黏土构造，最终的灾害等级由上述得到的易感性等级结合灾害性胀缩密度得出，该密度以每100 km²实际出露的城市化地表面积为统计基准。