Pavoni Mirko, Sirch Fabio, Boaga Jacopo
Department of Geosciences, University of Padova, via Gradenigo 6, 35131 Padova, Italy.
Sensors (Basel). 2021 Feb 11;21(4):1294. doi: 10.3390/s21041294.
The monitoring of rock glaciers plays a relevant role in relation to natural hazards in high mountain environments. Due to the climate warming, mountain permafrost is thawing, and its degradation is influencing the triggering and the evolvement of processes such as rockfalls, landslides, debris flows and floods. Therefore, the study and monitoring of these periglacial forms have both a scientific and economic importance. We tested electrical and electromagnetic measurements along the same investigation lines, in two different sites of the Dolomites area (Northeast Italy). Electrical prospecting exploits the high resistivity contrast between frozen and non-frozen debris. However, these measurements have high logistic demands, considering the complex rock glaciers surface and the need of ground galvanic contact. For this reason, we tried to compare electrical measurements with electromagnetic contactless ones, that theoretically can be used to define the distribution of electrical resistivity in the first subsoil in a quicker and easier way. The obtained results show that the joint use of the two methods allows us to characterize a rock glacier subsoil with good confidence. Finally, the advantages and disadvantages of both the techniques are discussed.
在高山环境中，对石冰川的监测在自然灾害方面具有重要意义。由于气候变暖，山地多年冻土正在融化，其退化影响着诸如落石、滑坡、泥石流和洪水等过程的触发和演变。因此，对这些冰缘地貌的研究和监测具有科学和经济上的重要性。我们在多洛米蒂山脉地区（意大利东北部）的两个不同地点，沿着相同的调查线路进行了电法和电磁测量。电法勘探利用了冻结和未冻结碎屑之间的高电阻率差异。然而，考虑到石冰川表面复杂以及需要接地电接触，这些测量有很高的后勤需求。因此，我们试图将电法测量与电磁非接触测量进行比较，电磁非接触测量理论上可以更快速、更轻松地用于确定表层土壤中电阻率的分布。所得结果表明，两种方法的联合使用使我们能够相当有把握地对石冰川的下层土壤进行特征描述。最后，讨论了两种技术的优缺点。
