Relation Between Water Drainage and Short-term Strain/velocity Events on Storglaciaren, Sweden, and Geomorphic Implications

斯托格拉西亚伦冰川位于瑞典北部，是一座以温带为主的山谷冰川，其底部有一层过度加深的冰层。在冰川过度加深的过程中，至少在局部地区，冰川被一层饱和的可变形冰层覆盖，冰川排水系统是巨大的，水压一直很高。在这里，水输入的日变化似乎也会导致地下水位的长而低的波动。这些波在向冰川下游移动时似乎被放大了，导致了冰川表面的局部日间隆起。由于过度加深的下冰川，排水是冰下的，水压有很大的(通常是7b)日变化。在这里，峰值速度似乎出现在水压上升和下降期间，而不是在压力峰值期间。为了研究这些现象，将进行示踪实验和表面倾斜、应变、速度、内部变形和水压力的测量。预计这些结果不仅将澄清它们的原因，还将有助于对冰川对水压变化的反应有一个大致的了解。预计这一结果还将揭示冰川地质学的一个经典问题：冰川的起源和冰川床的过度加深。作为这一问题研究的一部分，一名博士后助理将调查冰川采石的过程。

There is an overdeepening in the bed of Storglaciaren, a predominantly temperate valley glacier in northern Sweden. In the overdeepening the glacier is, at least locally, underlain by a layer of water-saturated deformable till, the glacial drainage system is englacial, and water pressures are consistently high. Here also, diurnal variations in water input appear to result in long, low waves in the water table. These waves seem to become amplified as they move downglacier, resulting in a local diurnal uplift of the glacier surface. Downglacier from the overdeepening the drainage is subglacial and there are large (often 7 b) diurnal variations in water pressure. Here, peak velocities seem to occur during rising and falling water pressures, rather than during the peak pressure. Tracer experiments and measurements of surface tilt, strain, velocity, internal deformation, and water pressure will be undertaken to study these phenomena. The results are expected to not only clarify their causes, but also to contribute to a general understanding of the response of glaciers to variations in water pressure. The results are also expected to shed light in a classical problem of glacial geology: the origin of cirques and overdeepening in glacier beds. As part of the study of this problem, a post- doctoral research associate will be investigating processes of glacial quarrying.