Monsoonal hillslope processes determine grain size‐specific suspended sediment fluxes in a trans‐Himalayan river
Monsoonal hillslope processes determine grain size‐specific suspended sediment fluxes in a trans‐Himalayan river
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季风山坡过程决定跨喜马拉雅河流中特定粒度的悬浮沉积物通量
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
R. Dahal
中科院分区：
文献类型：
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作者：
M. Struck;C. Andermann;N. Hovius;O. Korup;J. Turowski;Raju Bista;H. Pandit;R. Dahal
河流中的沉积物记录了侵蚀过程的动态。虽然散装沉积物通量很容易和常规获得，沉积物口径仍然underexplored推断侵蚀机制时。然而，沉积物粒度分布可能是区分其来源的关键。我们研究了Kali Gandaki（一条主要的跨喜马拉雅河流）中特定粒度的悬浮泥沙通量。两个地理位置优越的测量站可以追踪喜马拉雅山脉地形屏障两侧的沉积物口径。资料表明，细泥沙输入到北方源头是持久的，而粗泥沙来自高喜马拉雅山脉在夏季风。时间匹配的滑坡清单同样表明季风驱动的山坡质量浪费的突出性。因此，沉积物供应机制可以在河流口径中留下强烈的痕迹，这可能会远远超出山前，并增加造山带侵蚀沉积记录的可变性。
Sediments in rivers record the dynamics of erosion processes. While bulk sediment fluxes are easily and routinely obtained, sediment caliber remains underexplored when inferring erosion mechanisms. Yet sediment grain size distributions may be the key to discriminating their origin. We have studied grain size‐specific suspended sediment fluxes in the Kali Gandaki, a major trans‐Himalayan river. Two strategically located gauging stations enable tracing of sediment caliber on either side of the Himalayan orographic barrier. The data show that fine sediment input into the northern headwaters is persistent, while coarse sediment comes from the High Himalayas during the summer monsoon. A temporally matching landslide inventory similarly indicates the prominence of monsoon‐driven hillslope mass wasting. Thus, mechanisms of sediment supply can leave strong traces in the fluvial caliber, which could project well beyond the mountain front and add to the variability of the sedimentary record of orogen erosion.
影响因子：
6.3
作者：
Hendrik Wulf;B. Bookhagen;D. Scherler
通讯作者：
Hendrik Wulf;B. Bookhagen;D. Scherler