Analysis of the Evolution of Lowland Landslides in Temperate Environments According to Climatic Conditions Based on LiDAR Data: A Case Study from Rilly (Champagne Vineyard Region, Northeastern France)

Lowland landslides are very common in temperate climates but are less studied than in mountainous regions. Although they are often less spectacular, they can cause considerable damage to the land they affect. In Champagne (France), this is particularly the case in vineyards where land prices are very high. Often, they are the result of the reactivation or resumption of older, often larger and deeper landslides. The recurrence of landslides throughout the Holocene is accepted in the region but not proven. The aim of this contribution was to characterize the temporal evolution of instabilities using two LiDAR images and to understand the impact of the climate on the temporal distribution and activity of landslides. In the upper part of the landslide, displacements affect a surface area of 5500 m2 during a period of strong climatic variations. Moreover, the entire slide, 30 m deep, still appears to be moving. A comparison of two LiDAR images, therefore, enabled us to analyze the displacements with precision and to assess the associated risk management.