Sediment continuity through the upland sediment cascade: geomorphic response of an upland river to an extreme flood event
Sediment continuity through the upland sediment cascade: geomorphic response of an upland river to an extreme flood event
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高地沉积物级联的沉积物连续性：高地河流对极端洪水事件的地貌响应
DOI：
10.1016/j.geomorph.2018.05.002
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Joyce H
中科院分区：
文献类型：
--
作者：
Joyce H
据报道，在极端洪水期间，坡面侵蚀和加速的湖泊沉积是高地泥沙梯级中泥沙的来源和主要储存。虽然过渡带的高地河谷漫滩系统有可能在极端事件期间影响沉积物的连续性，但它们的地貌响应很少被量化。本文通过调节的高地河谷河流系统(英国坎布里亚州圣约翰贝克)对极端风暴德斯蒙德(2015年12月4-6日)洪水事件的响应，量化了沉积物的连续性。泥沙预算框架被用来量化地貌响应和评估事件期间的泥沙输送。现场测量表明，在这次事件中，河流滩地、堤岸和河床被侵蚀或冲刷的泥沙为6500 ± 710 t，其中6300 ± 570 t的泥沙沉积在河道或周围的滩地。洪水期间侵蚀的泥沙有6%被运出了8 公里的航道。洪泛区的泥沙储存被认为仅限于河道不受限制的漫滩水流区域。结果表明，高地泛滥平原河谷不是作为有效的转移河段发挥作用，而是由大量的储存区组成，这些储存区捕获粗大的洪水沉积物，并扰乱下游沉积物的连续性。
Hillslope erosion and accelerated lake sedimentation are often reported as the source and main stores of sediment in the upland sediment cascade during extreme flood events. While upland valley floodplain systems in the transfer zone have the potential to influence sediment continuity during extreme events, their geomorphic response is rarely quantified. This paper quantifies the sediment continuity through a regulated upland valley fluvial system (St John's Beck, Cumbria, UK) in response to the extreme Storm Desmond (4–6 December 2015) flood event. A sediment budget framework is used to quantify geomorphic response and evaluate sediment transport during the event. Field measurements show 6500 ± 710 t of sediment was eroded or scoured from the river floodplains, banks and bed during the event, with 6300 ± 570 t of sediment deposited in the channel or on the surrounding floodplains. <6% of sediment eroded during the flood event was transported out of the 8 km channel. Floodplain sediment storage was seen to be restricted to areas of overbank flow where the channel was unconfined. Results indicate that, rather than upland floodplain valleys functioning as effective transfer reaches, they instead comprise significant storage zones that capture coarse flood sediments and disrupt sediment continuity downstream.
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DOI：
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DOI：
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发表时间：
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