Spatial assessment of permafrost characteristics and dynamics in alpine periglacial environments

了解永冻土主导的冰缘环境中地下的内部结构和特征是评估气候变化对永冻土动态的持续和未来影响的关键。到目前为止，还没有详细的空间调查的永久冻土特性和地下内部结构进行了较大规模的已知的小规模的异质性，虽然必要的工具，如二维地球物理方法是可用的，并已成功地应用于粗糙的山区地形。在计划的研究项目范围内，应采用不同的地表和地下特征调查方法，综合调查高山永冻土环境对气候变化的敏感性。应用二维地球物理方法对地下岩性、构造和冰含量进行详细的地球物理测绘。这些数据与地貌测绘和冰缘地貌地面激光扫描的结果一起，为评估沉积物收支和冰含量变化提供了基础。高山永久冻土动态的时空变化是通过直接测量代表性浅钻孔内的温度、近地表温度和地电监测来确定的。基于这些研究结果，方案可以开发未来的冻土动态及其对景观演变的影响。

Knowledge of the internal structure and characteristics of the subsurface in permafrost-dominated periglacial environments is a key to assess ongoing and future impact of climate change on permafrost dynamics. So far no detailed spatial investigation of permafrost characteristics and subsurface internal structure has been performed on a larger scale with respect to the known small-scale heterogeneity, although the necessary tools such as two-dimensional geophysical methods are available and have been applied successfully in rough mountain terrain. Within the planned research project the sensitivity of alpine permafrost environments to climate change shall be investigated with a combined approach using different methodologies for the investigation of surface and subsurface characteristics. Two-dimensional geophysical methods are applied to perform a detailed geophysical mapping of the subsurface lithology, structure and ice content. Together with the results from geomorphological mapping and terrestrial laser scanning of the periglacial landforms, these data provide the base for the assessment of sediment budgets and ice content changes. Spatio-temporal variability of alpine permafrost dynamics is determined by direct measurements of temperature within representative shallow boreholes, near-surface temperature and geoelectrical monitoring. Based on these findings, scenarios can be developed concerning future permafrost dynamics and its impact on landscape evolution.