Dataset Direct Download Service (WFS): Mapping of the haea removal of clays in the municipality of Marestaing (Gers)

The mapping of the hay removal of clays in the municipality of Marestaing 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.该数据集为法国热尔省马雷斯坦冈市境内黏土胀缩现象的填图成果，其数据源自法国地质矿产调查局（BRGM）的省域地质填图。该填图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，基于纯物理准则编制了易发性图件，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（岩性分析）； — 黏土相中膨胀矿物的占比（矿物组成分析）； — 岩土体的工程地质特性。 针对已识别的各黏土地层，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平方千米实际出露的城市化地表为统计基准）计算得出。