The recently-advancing Taku Glacier is excavating subglacial sediments at high rates over multi-decadal timescales. However, sediment redistribution over shorter timescales remains unquantified. We use a variety of methods to study subglacial and proglacial sediment redistribution on decadal, seasonal, and daily timescales to gain insight into sub- and proglacial landscape formation. Both excavation and deposition were observed from 2003 to 2015 (2.8 ± 0.9 m a−1 to +2.9 ± 0.9 m a−1). The observed patterns imply that a subglacial conduit has occupied the same site over the past decade. Outwash fans on the subaerial end moraine experience fluvial sediment reworking almost year-round, with net sediment gain in winter and net sediment loss in summer, and an overall mass gain between 2005 and 2015. We estimate that tens of meters of sediment still underlie the glacier terminus, sediments which can be remobilized during future activity. However, imminent retreat from the proglacial moraine will limit its sediment supply, leaving the moraine vulnerable to erosion by bordering rivers. Retreat into an over-deepened basin will leave the glacier vulnerable to increased frontal ablation and accelerating retreat.

中文翻译：

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阿拉斯加塔库冰川 (T'aakú Kwáan Sít'i) 前进冰川终点下的沉积物再分布

最近推进的 Taku Glacier 正在以数十年的时间尺度高速挖掘冰下沉积物。然而，沉积物在较短时间尺度上的重新分布仍未量化。我们使用各种方法来研究年代际、季节和每日时间尺度上的冰下和前冰期沉积物再分布，以深入了解亚冰期和冰河期景观的形成。从 2003 年到 2015 年（2.8 ± 0.9 ma-1至 +2.9 ± 0.9 毫安-1）。观察到的模式意味着冰下管道在过去十年中占据了同一地点。陆端冰碛上的外冲风扇几乎全年都在经历河流沉积物改造，冬季净沉积物增加，夏季净沉积物流失，2005 年至 2015 年总体质量增加。我们估计数十米的沉积物仍然构成冰川终点，可以在未来活动中重新移动的沉积物。然而，前冰期冰碛即将撤退将限制其沉积物供应，使冰碛容易受到毗邻河流的侵蚀。撤退到一个过深的盆地将使冰川容易受到正面消融和加速撤退的影响。