Simple download service (Atom) of the dataset: DDT 70 — Aleas clay gonlement in Haute-Saône in 2009

Background document updated following the BRGM study report (public document) and positioning of hazard zones in shapefiles format, in 2009. No occurrence — Geological risks. The phenomenon of dewatering of clay soils during pronounced and/or lasting drought causing deformations of the soil surface (differentiated cutters). It can be followed by swelling phenomena as initial hydrogeological conditions recover or more rarely creep with softening.本背景文档于2009年依据法国地质与矿业研究局（BRGM）的公开研究报告，以及以shapefiles格式存储的危险区域划定结果完成更新。本数据集未收录地质风险相关灾害事件的发生记录。 该现象指在显著且/或持续性干旱期间，黏土土体发生脱水，进而引发地表不均匀变形（differentiated cutters）。当地下水文地质条件恢复至初始状态时，可能伴随出现土体膨胀现象；极少数情况下还会发生软化蠕变。