Simple download service (Atom) of the dataset: N_ZONE_ALEA_PPRN_20140218_S_032

The mapping of the hay removal of clays in the commune of Gavarret-sur-Aulouste 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.本数据集所用的热尔省奥卢斯特河畔加瓦雷市镇黏土隆胀治理相关图件，源自法国地质矿产调查局（BRGM）编制的省级图件。该图件为胀缩性黏土现象发生概率的分区图。 法国地质矿产调查局（BRGM）首先基于纯物理准则，以该省的地质图为基础编制了敏感性分区图，编制过程中针对每个地质单元，综合考量了以下因素： — 地层内黏土物质占比（岩相分析）； — 黏土相内吹扬矿物占比（矿物组成）； — 该物质的岩土性状。 针对已识别的每一处黏土地层，最终的灾害等级由前述敏感性等级结合灾害性胀缩密度（以每100平方千米实际城市化出露地表为统计基准）共同确定。