Coarse sediment dynamics in a proglacial fluvial system (Fagge River, Tyrol)

Coarse sediment dynamics in a proglacial fluvial system (Fagge River, Tyrol)
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前冰川河流系统中的粗沉积物动力学(法格河,蒂罗尔州)

DOI:
10.1016/j.geomorph.2013.10.021
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发表时间:
2014
期刊:
影响因子:
3.9
通讯作者:
Morche
Morche
中科院分区:
地球科学2区
文献类型:
--
作者:
Baewert;Morche

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高山地区受到全球气候变化的强烈影响。自小冰期(LIA)结束以来,高山冰川一直处于负的净平衡状态。由于冰川的退缩,新暴露的冰下沉积物的前冰期地区正在扩大。这些沉积物(冰碛、丘陵、冰川河流沉积物等)未固结,几乎没有植被,因此不稳定,极易受到地貌过程引发的地表变化的影响。特别是在强降雨事件期间,冰川和冰川河流沉积物在河流系统内被重新移动和运输。这项研究的重点是法格河前冰川系统中快速变化的表面,该河流流经奥地利最大的冰川之一,位于奥地利的考内塔尔。现场覆盖了从冰川口(海拔2206米)到Fagge河出水口(海拔1750米)进入Gepatsch水库的区域。本研究的主要目的是测量原冰期地区与河流系统直接相关的重要沉积物源(冲积平原、沙洲)的地表变化并量化其质量平衡。为此,使用Optech ILRIS-36D激光扫描仪进行多次地面激光扫描。在2011年和2012年的野外季节,对几个沉积物源进行了至少两次扫描。调查期间地表变化明显,主要由2012年8月26日暴雨后的极端洪水事件引起。在这一事件中,大量沉积物(约70000 m3)被重新移动,特别是在前冰期区域的上部,并在进一步的下游积聚。
Alpine regions are strongly affected by the global climate change. Alpine glaciers have had a negative net balance since the end of the Little Ice Age (LIA). Proglacial areas with freshly exposed subglacial sediments are expanding due to the retreat of glaciers. These sediments (moraines, tills, glaciofluvial deposits, etc.) are unconsolidated, nearly unvegetated and therefore unstable and highly vulnerable to surface changes triggered by geomorphological processes. Particularly during heavy rainfall events, glacial and glaciofluvial deposits are remobilized and transported within the fluvial system.This study is focused on rapidly changing surfaces in the proglacial fluvial system of the Fagge River, which drains the Gepatschferner, one of the biggest glaciers in Austria, and is located in the Kaunertal/Austria. The field site covers an area from the snout of the glacier (2206 m a.s.l.) to the outlet of the Fagge River into the Gepatsch Reservoir at (1750 m a.s.l.). The main goal of this study is to measure surface changes and quantify mass balances of important sediment sources (alluvial plains, bars) in the proglacial area, which are directly connected to the fluvial system. For this purpose, multiple terrestrial laser scans are performed with an Optech ILRIS-36D laser scanner. During the field season in 2011 and 2012, several sediment sources were scanned at least twice.Significant surface changes occurred during the investigation period, mainly caused by an extreme flood event after heavy rain on August 26, 2012. Large amounts of sediment (> 70,000 m3) were remobilized, especially in the upper parts of the proglacial area, and were accumulated further downstream during this event.
维苏威火山上的第一个地面激光扫描仪应用:火山口的高分辨率模型
DOI: --
发表时间: 2007
期刊:
影响因子: --
作者:
A. Pesci;F. Loddo;D. Conforti
通讯作者: D. Conforti
地面激光扫描仪
DOI: --
发表时间: 2007
期刊:
影响因子: --
作者:
G. Burton
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描述寒冷环境中从源头到汇的河流沉积物通量的框架
DOI: 10.1111/j.1468-0459.2010.00387.x
发表时间: 2010
期刊: Geografiska Annaler: Series A, Physical Geography
影响因子: --
作者:
J. Orwin;S. Lamoureux;J. Warburton;A. Beylich
通讯作者: A. Beylich
DOI: 10.1127/0372-8854/2011/0055s2-0046
发表时间: 2011
期刊:
影响因子: --
作者:
Bimböse;Nicolay;Schmidt;Morche
通讯作者: Morche
高山前冰期河流沉积物收支
DOI: 10.1080/04353676.1990.11880322
发表时间: 1990
影响因子: 1.5
作者:
J. Warburton
通讯作者: J. Warburton