Simple download service (Atom) of the dataset: Map of the haea removal swelling of clays on the commune of Fleurance (Gers)

The mapping of the hay removal of clays in the commune of Fleurance in the department of Gers 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.

本次针对热尔省弗勒朗斯公社内黏土胀缩危害的制图数据，源自法国地质矿产调查局（BRGM）编制的该省省级地质制图成果。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）首先依据纯物理准则，基于该省地质图编制了敏感性分区图，编制过程中针对每个地质单元，综合解译了以下因素：
— 地质单元内黏土物质的占比（岩相分析）；
— 黏土组分中膨胀性矿物的占比（矿物组成分析）；
— 该物质的岩土工程特性。
针对已识别的每一类黏土地质单元，最终的危害等级由上述敏感性等级结合灾害性胀缩密度（以每100平方千米实际出露的城市化地表面积为统计基准）计算得出。