ABSTRACT Glacier-permafrost interactions are investigated to understand glacial-hydrological influence along a partly glacierised valley on the NE flank of the Snøhetta massif, Dovrefjell, southern Norway. Of particular interest is how processes are controlled by a hydrological connection between landforms. Field mapping identified an ice-marginal landsystem comprising a polythermal glacier, a proglacial lake, an ice-cored moraine complex and a river-lake with perennial frost mounds. A clear interaction between glacial and periglacial processes was observed in transitional landforms, most prominently in the ice-cored moraine which constitutes a permafrost environment that is directly reworked by glaciofluvial processes. The role of this interaction in controlling seasonal, partial drainage of the proglacial lake was assessed using remote sensing-based observations of lake surface size evolution and seasonal surface subsidence. Results suggest a two-fold threshold for lake drainage: Depending on the dynamics of glacial discharge and active layer depth, the ice-cored moraine may either act as a barrier or a pathway to meltwater exiting the glacier. This demonstrates the importance of meltwater dynamics in controlling landform evolution in a glacial-periglacial landscape. To further assess the importance of surface and subsurface hydrology in linking glacial and periglacial domains, water stable oxygen isotope ratios across the study area were studied to map the flow of meltwater from glacier to permafrost. Results include a model of the surface and subsurface hydrology in the catchment and promote a conceptual understanding of water as a thermal, hydraulic and mechanical agent of transient glacier-permafrost interaction operating at heterogeneous timescales.

中文翻译：

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挪威多夫雷耶尔 Snøhetta 与水文地貌过程和地貌相关的冰川-永久冻土相互作用的证据

摘要：研究冰川-永久冻土的相互作用，以了解沿挪威南部多夫雷耶尔 Snøhetta 地块东北侧部分冰川化山谷的冰川-水文影响。特别令人感兴趣的是如何通过地形之间的水文联系来控制过程。实地测绘确定了一个冰缘陆地系统，包括一个多热冰川、一个前冰河湖、一个冰芯冰碛复合体和一个带有常年霜冻丘的河湖。在过渡地貌中观察到冰川和冰缘过程之间的明显相互作用，最突出的是冰芯冰碛，它构成了由冰川河流过程直接改造的永久冻土环境。这种相互作用在控制季节性方面的作用，使用基于遥感的湖面大小演变和季节性地表沉降观测评估了前冰河湖的部分排水情况。结果表明湖泊排水的双重阈值：根据冰川排放的动态和活动层深度，冰芯冰碛可能充当屏障或融水离开冰川的通道。这证明了融水动力学在控制冰川 - 冰缘景观中地貌演变的重要性。为了进一步评估地表和地下水文学在连接冰川和冰缘域方面的重要性，研究了整个研究区域的水稳定氧同位素比率，以绘制融水从冰川到永久冻土的流动图。