实验室尺度下不同含水量对泥石流沉积物形态变化的诱导作用

IF 3.7 2区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
Nikhil Kumar Pandey, Neelima Satyam
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引用次数: 0

摘要

夹带作用是形成泥石流沉积的关键,影响其形态和动力学。了解由夹带引起的沉积对于改善减轻危害和沉积物管理战略至关重要。本研究采用小型水槽装置来研究含水量(w/c)、沉积物组成和河床形态对颗粒流动行为的相互作用。在不同的w/c(20-50%)和可蚀床构型下进行了16次实验,并分析了沉积物的形态,包括宽度、厚度和跳动长度。研究结果揭示了不同w/c水平下沉积物形态的不同模式。在较低的w/c(20-24%)下,沉积物呈宽而短的裂片,冲刷作用最小,形成锥形结构。中等w/c(~ 28%)增强了流动流动性,在水槽床附近产生较厚的沉积物,因为夹带减少了。在较高的w/c(30-50%)下,受更大的夹带体积和更长的跳动距离的驱动,沉积物进一步向下游移动。虽然较高的碳水比降低了沉积物厚度,但它们显著拓宽了跳跃沉积物,表明碳水比和夹带的双重影响。随着携带量的增加,沉积物变宽并变平,携带与流动流动性之间出现了明确的关系。此外,含水量在控制沉积物厚度方面占主导地位,强调了其在沉积物输运动力学中的关键作用。沉积物分选不良,具有类似于自然泥石流的独特层理结构,验证了实验设置。该研究提供了一种有效且可扩展的方法来分析可蚀层中的颗粒流动行为。研究结果提供了对沉积物运移过程的深入了解,弥合了中尺度实验与自然灾害缓解和岩土工程实际应用之间的差距。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Entrainment-driven morphological changes in debris flow deposits by varying water content at laboratory scale

Entrainment is crucial in shaping debris flow deposits, influencing their morphology and dynamics. Understanding deposition driven by entrainment is vital for improving hazard mitigation and sediment management strategies. This study employs a small-scale flume setup to examine the interplay between water content (w/c), sediment composition, and bed morphology on granular flow behavior. Sixteen experiments were conducted, varying w/c (20–50%) and erodible bed configurations, with deposit morphology analyzed for width, thickness, and runout length. The findings revealed distinct patterns in deposit morphology across w/c levels. At lower w/c (20–24%), deposits exhibited broad, shorter lobes with minimal scouring, forming cone-shaped structures. Moderate w/c (~ 28%) enhanced flow mobility, producing thicker deposits near the flume bed due to reduced entrainment. At higher w/c (30–50%), deposits shifted further downstream, driven by greater entrainment volumes and longer runout distances. While higher w/c levels decreased deposit thickness, they significantly widened the runout deposits, demonstrating the dual influence of w/c and entrainment. A clear relationship emerged between entrainment and flow mobility, as increased entrainment volumes widened and flattened deposits. Additionally, water content dominated entrainment in controlling deposit thickness, underscoring its critical role in sediment transport dynamics. The deposits were poorly sorted, with a distinct bedding structure akin to natural debris flows, validating the experimental setup. This study provides an efficient and scalable methodology for analyzing granular flow behavior in erodible beds. The results offer insights into sediment transport processes, bridging the gap between mesoscale experiments and real-world applications in natural hazard mitigation and geotechnical engineering.

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来源期刊
Bulletin of Engineering Geology and the Environment
Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合
CiteScore
7.10
自引率
11.90%
发文量
445
审稿时长
4.1 months
期刊介绍: Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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