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首页> 外文会议>Erosion and sediment yields in the changing environment >Decadal sediment yield from an Alpine proglacial zone inferred from reservoir sedimentation (Pasterze, Hohe Tauern, Austria)
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Decadal sediment yield from an Alpine proglacial zone inferred from reservoir sedimentation (Pasterze, Hohe Tauern, Austria)

机译：由储层沉积推断出的高寒冰川带年代际沉积物产量（Pasterze，Hohe Tauern，奥地利）

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摘要

Reservoir sedimentation over more than five decades enabled the quantification of subrecent sediment yield from the glacierized Pasterze catchment, a 40-km2 basin located in the Hohe Tauern Mountain range in Austria. Sediment yield is highly variable over an order of magnitude (1.5 to 16.7 × 10~4 t/year) with an average of～6.3 ± 0.5×10~4 t/year resulting in a total sediment export of approx. 340 × 10~4 t of mainly fine grained sediment (D_(50) Ø coarse silt). This is equal to specific sediment yields (SSY) ranging from 0.4 to 4.2 ×10~3 t/km~2/year (Ø 1.6±0.1 × 10~3 t/km~2/year) at a total of 85.6 × 10~3 t/km~2 in the 54 years studied. No significant correlation is found between annual data sets of sediment yield, discharge, glacial retreat and hydro-climate. Based on multi-temporal geomorphological mapping, a sandur (former proglacial lake) and a braid plain are identified as key landforms within the proglacial zone modulating sediment yield. It is assumed that sediment yield from proglacial zones will increase due to climate change which accelerates glacier melt. This study shows the impact of proglacial lakes on sediment yield which can reduce the connectivity between glacial sediment production and downstream sediment fluxes. The number of proglacial lakes within the Alps is expected to rise following accelerated glacial retreat. Three basins are located under the present tongue of Pasterze Glacier and further lakes will develop. It is assumed that sediment delivery from the Pasterze catchment will most likely be significantly altered in the near future. This will lead to changes in sediment yields with impacts on hydrology, river ecology and reservoir management.
机译：超过五十年的水库沉积使量化来自冰川化的Pasterze集水区的近新沉积物产量成为可能。该区位于奥地利Hohe Tauern山脉，面积为40 km2。沉积物产量在一个数量级（1.5至16.7×10〜4 t /年）内变化很大，平均约为6.3±0.5×10〜4 t /年，导致沉积物总出口量约为。 340×10〜4 t主要为细颗粒沉积物（D_（50）Ø粗粉砂）。这等于0.4至4.2×10〜3 t / km〜2 /年的特定沉积物产量（SSY）（Ø1.6±0.1×10〜3 t / km〜2 /年），总计85.6×10在研究的54年中，〜3 t / km〜2。在每年的沉积物产量，流量，冰川退缩和水文气候数据之间没有发现显着相关性。基于多时相地貌制图，将桑杜尔（前冰河湖）和辫状平原确定为冰河带内调节沉积物产量的关键地貌。据推测，由于气候变化加速了冰川融化，冰川地区的沉积物产量将增加。这项研究表明，冰川湖对沉积物产量的影响可以减少冰川沉积物生产与下游沉积物通量之间的联系。随着加速的冰川退缩，预计阿尔卑斯山内的冰川湖数量将会增加。在Pasterze Glacier当前的舌下有3个盆地，还将进一步开发湖泊。据推测，在不久的将来，巴斯德集水区的沉积物输送将很可能发生重大变化。这将导致沉积物产量的变化，从而影响水文，河流生态和水库管理。

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