简单水力跃迁方程揭示的泥石流湍流侵蚀模式和隐藏动量

IF 4.6 1区 地球科学 Q2 ENVIRONMENTAL SCIENCES
Qian Chen, Dongri Song, Xiaoqing Chen, Lei Feng, Xiaoyu Li, Wei Zhao, Yaonan Zhang
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引用次数: 0

摘要

颗粒雪崩的侵蚀-沉积传播非常普遍,可能会增加其破坏力。然而,对于缓坡上的泥石流,很少有关于这一过程的报道,而且隐藏在浪涌前沿下的动量对泥石流破坏性的贡献也不明确。因此,人们通常用明显的浪涌前沿所携带的动量来表示泥石流的破坏性。本研究通过在蒋家峡谷(中国云南省)测得的涌深水文图证实了侵蚀-沉积传播。根据简单的水力跃迁方程,量化了涌流的侵蚀沉积深度,并将侵蚀模式分为两种(浅侵蚀和深侵蚀)。对于具有侵蚀-沉积传播的涌流,已证实其具有明显的向下侵蚀潜力,碎片流涌流侵蚀被认为是深度侵蚀。浪涌流携带的总动量由两个弗劳德数(浪涌前弗劳德数和浪涌后弗劳德数)进一步量化,并通过对浪涌流的实地观测得到验证。浪涌流的总动量不仅来源于明显的浪涌前沿,还包括侵蚀沉积层内的动量。这项研究为量化侵蚀深度上限和揭示泥石流涌的破坏性提供了一种理论方法。研究强调了基质沉积对缓坡上泥石流侵蚀的重要性,因为这种方法可以提高泥石流风险评估的可靠性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Erosion Pattern and Hidden Momentum in Debris-Flow Surges Revealed by Simple Hydraulic Jump Equations
The erosion-deposition propagation of granular avalanches is prevalent and may increase their destructiveness. However, this process has rarely been reported for debris flows on gentle slopes, and the contribution of momentum hidden under the surge front to debris-flow destructiveness is ambiguous. Therefore, the momentum carried by the apparent surge front is often used to indicate debris-flow destructiveness. In this study, the erosion-deposition propagation is confirmed by surge-depth hydrographs measured at the Jiangjia Ravine (Yunnan Province, China). Based on simple hydraulic jump equations, the eroded deposition depth of surge flow is quantified, and the erosion pattern can be divided into two patterns (shallow and deep erosion). For surge flows with erosion-deposition propagation, significant downward erosion potential is confirmed, and debris-flow surge erosion is considered the deep erosion. The total momentum carried by surge flow is further quantified by two Froude numbers (surge-front and rearward Froude numbers) and verified through the field observation of surge flows. The total momentum of surge flow not only originates from the apparent surge front, but also includes the momentum within the eroded deposition layer. This study provides a theoretical approach for quantifying the upper limit of erosion depth and revealing the destructiveness of debris-flow surges. A perspective on the importance of substrate deposition for debris-flow erosion on gentle slopes is emphasized, as this approach can improve the reliability of debris-flow risk assessment.
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来源期刊
Water Resources Research
Water Resources Research 环境科学-湖沼学
CiteScore
8.80
自引率
13.00%
发文量
599
审稿时长
3.5 months
期刊介绍: Water Resources Research (WRR) is an interdisciplinary journal that focuses on hydrology and water resources. It publishes original research in the natural and social sciences of water. It emphasizes the role of water in the Earth system, including physical, chemical, biological, and ecological processes in water resources research and management, including social, policy, and public health implications. It encompasses observational, experimental, theoretical, analytical, numerical, and data-driven approaches that advance the science of water and its management. Submissions are evaluated for their novelty, accuracy, significance, and broader implications of the findings.
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