Dataset Direct Download Service (WFS): N_ZONE_ALEA_PPRN_20140426_S_032

The mapping of the hay removal of clays in the commune of Lelin-Lapujolle 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.法国热尔省莱兰-拉皮约勒（Lelin-Lapujolle）市镇范围内的黏土胀缩分布图件提取自法国地质矿业研究局（BRGM）的省级制图成果。该图件为黏土土壤胀缩现象发生概率的分区图。法国地质矿业研究局（BRGM）首先依托该省地质图件，基于纯物理准则编制了易发性图件，编图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（岩性分析）； — 黏土相中膨胀性矿物占比（矿物组成分析）； — 该物质的岩土工程特性。 针对已识别的每个黏土地质单元，最终的灾害等级由上述易发性等级结合有害胀缩密度（以每100平方千米实际出露城市化地表为统计基准）计算得出。