Decadal sediment yield from an Alpine proglacial zone inferred from reservoir sedimentation (Pasterze, Hohe Tauern, Austria)
Decadal sediment yield from an Alpine proglacial zone inferred from reservoir sedimentation (Pasterze, Hohe Tauern, Austria)
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根据水库沉积推断的高山前冰川带的年代际沉积物产量（奥地利上陶恩州帕斯特泽）
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发表时间：
2012
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通讯作者：
L. Schrott
中科院分区：
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作者：
M. Geilhausen;J. Otto;D. Morche;L. Schrott
水库沉积超过50年，使从冰川Pasterze流域，40平方公里的盆地位于奥地利Hohe Tauern山脉的次近期沉积物产量的量化。产沙量在一个数量级上变化很大（1.5至16.7 × 10 - 4吨/年），平均约为6.3 ± 0.5 × 10 - 4吨/年，导致总的沉积物输出量约为100万吨/年。340 × 104 t，主要为细粒泥沙（D50 ~ 100 μ m粗粉砂）。这等于比产沙量（SSY），范围为0.4至4.2 × 103 t/km 2/年（1.6 ± 0.1 × 103 t/km 2/年），在研究的54年中总计为85.6 × 103 t/km 2。没有显着的相关性之间的年度数据集的产沙量，流量，冰川退缩和水文气候。基于多时相地貌制图，一个桑杜尔（前冰前湖）和辫状平原被确定为关键地貌内的冰前带调节产沙量。据推测，由于气候变化加速了冰川融化，冰前区的沉积量将增加。这项研究表明，冰前湖泊对产沙量的影响，可以减少冰川沉积物生产和下游沉积物通量之间的连接。随着冰川加速退缩，阿尔卑斯山内的冰前湖泊数量预计将增加。三个盆地位于Pasterze冰川目前的舌头下，进一步的湖泊将发展。据推测，从Pasterze流域的沉积物输送将很可能在不久的将来显着改变。这将导致泥沙量的变化，对水文、河流生态和水库管理产生影响。
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 t/year) with an average of ~ 6.3 ± 0.5 × 10 t/year resulting in a total sediment export of approx. 340 × 104 t of mainly fine grained sediment (D50 Ø coarse silt). This is equal to specific sediment yields (SSY) ranging from 0.4 to 4.2 × 103 t/km2/year (Ø 1.6 ± 0.1 × 103 t/km2/year) at a total of 85.6 × 103 t/km2 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.