Sediment Recruitment and Redistribution in Mountain Channel Networks by Post‐Wildfire Debris Flows
Sediment Recruitment and Redistribution in Mountain Channel Networks by Post‐Wildfire Debris Flows
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野火后泥石流对山地河道网络的沉积物补充和重新分布
DOI：
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发表时间：
2021
影响因子：
5.2
通讯作者：
E. Keller
中科院分区：
文献类型：
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作者：
K. Morell;P. Alessio;T. Dunne;E. Keller
我们使用激光雷达差分和实地观察来绘制体积，并解释2018年美国加利福尼亚州Montecito附近的大型野火后泥石流从山区峡谷中动员的沉积物的来源。泥石流逐渐夹带和部分再沉积550，000立方米的先前存储的通道沉积物在整个峡谷网络。观测结果表明，在砾石崩积层和泥石流沉积物堆积量最大的地方，冲刷深度和体积最高，并且冲刷持续超过山前，这表明在这种极端事件中，泥石流体积最终受到可用于冲刷的粗泥沙水库的控制。由于可用的沉积物储存量是由崩积体浪费、先前泥石流的规模和频率以及山谷形态提供的容纳空间的随机相互作用产生的，因此本研究加强了在开展泥石流灾害评估时估计沉积物储存量的重要性。
We used lidar differencing and field observations to map volumes, and interpret the origins of, sediment mobilized from mountain canyons by large post‐wildfire debris flows near Montecito, CA, USA in 2018. The debris flows progressively entrained and partially redeposited 550,000 m3 of previously stored channel sediments throughout the canyon networks. The observations that scour depths and volumes were highest where the largest volumes of bouldery colluvium and debris‐flow deposits had accumulated, and that scour persisted beyond the mountain front, indicates that debris‐flow volumes in this extreme event were ultimately controlled by the coarse sediment reservoir available for scour. Because the volumes of available stored sediment result from the stochastic interaction of colluvial mass wasting, the magnitude and frequency of previous debris flows, and the accommodation space provided by valley morphology, the study reinforces the importance of estimating stored sediment volumes when developing debris‐flow hazard assessments.
源头水道的干燥沉积物加剧了基岩景观中野火后的泥石流
影响因子：
5.8
作者：
DiBiase, Roman A.;Lamb, Michael P.
通讯作者：
Lamb, Michael P.