Simple download service (Atom) of the dataset: N_ZONE_ALEA_PPRN_20140157_S_032

The mapping of the alump removal of clays on the commune of Seysses-Savès in the Gers department 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.本次获取的热尔省赛斯-萨韦市镇黏土块体移除相关制图数据，源自法国地质矿产调查局（Bureau de Recherches Géologiques et Minières，BRGM）编制的省级制图成果。该制图为黏土土壤胀缩现象发生概率的分区图。法国地质矿产调查局（BRGM）最初基于纯物理标准，依托该省地质图编制了易发性分区图，编制过程中针对各地质地层单元考量了以下因素： — 地层单元内黏土物质的占比（岩相分析）； — 黏土相中膨胀性矿物的占比（矿物组成）； — 岩土体的工程性状。 针对已识别的各黏土地层单元，最终灾害等级由上述方法得到的易发性等级，结合折算至每100平方公里实际城市化出露地表的灾害性胀缩事件密度共同确定。