Sediment Transport and Bedrock Erosion by Wet Snow Avalanches in the Guggigraben, Matter Valley, Switzerland
Sediment Transport and Bedrock Erosion by Wet Snow Avalanches in the Guggigraben, Matter Valley, Switzerland
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瑞士马特谷古吉格拉本湿雪崩的沉积物输送和基岩侵蚀
DOI：
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Christen
中科院分区：
文献类型：
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作者：
J. Moore;J. Egloff;Jan Nagelisen;M. Hunziker;Ulrich Aerne;M. Christen
摘要湿雪崩突破积雪或覆盖无雪表面的基础，可以夹带基底物质，并作为重要的代理人的沉积物输送在陡峭的高山集水区。在这里，我们提出了从4年的测量结果在Guggigraben集水区（物质谷，瓦莱州），量化的沉积物运输量雪崩每个冬季。通过测量有代表性的区域内的碎片含量，然后推算累积体积，估算沉积物负荷。结果显示，2009年，2010年，2011年和2012年的总输沙量分别为70 m3，23 m3，15 m3和35 m3，对应的全流域侵蚀速率分别约为0.05，0.02，0.01和0.03 mm/a。沉积物似乎主要来自主河道或其支流，首先来自落石或滑坡。因此，在古吉地堑，雪崩在将松散沉积物从临时储存地点运送到扇和主要河流系统方面发挥着重要作用。在基岩沟壑和上述雪崩源区，暴露的基岩表面上有明显的磨损迹象。这些包括圆形和冲刷的基岩，新鲜的巨石撞击，以及沟壁上的划痕。
Abstract Wet snow avalanches breaking through to the base of the snowpack or overriding snowfree surfaces can entrain basal material and act as important agents of sediment transport in steep alpine catchments. Here we present results from 4 years of measurements at the Guggigraben catchment (Matter Valley, Canton Valais), quantifying the volume of sediment transported by avalanches each winter season. Sediment load was estimated by measuring the debris content within representative areas and then extrapolating the cumulative volume. Results reveal a total transported sediment volume of 70 m3 in 2009, 23 m3 in 2010, 15 m3 in 2011, and 35 m3 in 2012, which correspond to catchment-wide erosion rates of approximately 0.05, 0.02, 0.01, and 0.03 mm/a, respectively. Sediment appears to be sourced predominantly from within the main channel or one its tributaries, originating first from rockfall or landslides. Avalanches thus play an important role at the Guggigraben in transporting loose sediment from temporary storage sites to the fan and main river system. Within the bedrock gully and in the avalanche source region above, signs of abrasive wear were evident on exposed bedrock surfaces. These included rounded and scoured bedrock, fresh boulder impacts, and scratch marks on the gully walls.
野火斜坡上雪崩造成碎片运输的六年记录（蒂罗尔州阿恩斯皮茨）
影响因子：
2.2
作者：
Hoinkis;Wetzel
通讯作者：
Wetzel