Map Viewing Service (WMS) of the dataset: N_ZONE_ALEA_PPRN_20140419_S_032

The mapping of the hay removal of clays in the commune of Labarthete 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.热尔省拉巴尔特市镇（Labarthete）内黏土胀缩相关测绘成果源自法国地质矿产调查局（BRGM）编制的省级测绘数据。该成果为黏土胀缩现象发生概率的分区图件。法国地质矿产调查局（BRGM）最初以该省地质图为基础，依据纯物理准则编制了敏感性地图，编制过程中针对每个地质建造单元，综合考量了以下影响因素：— 该地质建造单元内黏土物质占比（岩相分析）；— 黏土相中膨胀矿物占比（矿物组成分析）；— 该材料的岩土工程特性。针对已识别的每个黏土地质建造单元，最终的灾害等级由前述敏感性等级结合灾害性胀缩密度确定，该密度以每100平方千米实际已城市化露头地表为统计基准。