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

瑞典 Storglaciaren 排水与短期应变/速度事件的关系及地貌影响

• 批准号: 8822156
• 负责人: Roger Hooke
• 金额: $ 31.35万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-15 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8822156&HistoricalAwards=false
• 关键词: Relation; Between; Water; Drainage; Short

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.

有一个在Storglaciaren床过度加深，一个 位于瑞典北方的主要是温带的山谷冰川。 在 冰川的过度加深，至少在局部，是由一个 水饱和的可变形冰碛层，冰川排水 系统是冰内的，水压一直很高。 在这里，水分输入的日变化似乎也会导致 在地下水位上形成了长长的低浪。 这些波浪似乎变成了 在冰川下移动时被放大，导致当地的昼夜变化 冰川表面的隆起。 从过度加深的冰川下 水系为冰下水系，有大型（通常为7 B） 水压的昼夜变化。 在这里，峰值速度似乎 发生在上升和下降的水压，而不是 在压力峰值期间。 示踪实验和测量表面倾斜，应变， 速度，内部变形和水压将是 他们致力于研究这些现象。 结果预计 不仅澄清其原因，而且还有助于一个普遍的 了解冰川对水的变化的反应 压力 这些结果也有望揭示一个经典问题 冰斗的起源和冰斗的过度加深 冰川床 作为对这一问题的研究的一部分，一个... 博士研究助理将调查的过程， 冰川采石