Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR029133 |
On how episodic sediment supply influences the evolution of channel morphology, bedload transport and channel stability in an experimental step-pool channel | |
Jiamei Wang; Marwan A. Hassan; Matteo Saletti; Xingyu Chen; Xudong Fu; Hongwei Zhou; Xingguo Yang | |
2021-07-09 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | We present results from flume experiments in which an 8% steep channel with longitudinal width variations and step-pool morphology was subjected to sediment feed pulses of different magnitude and frequency under constant water discharge. The channel response to these pulses included (a) large bedload transport rates, (b) bed aggradation, (c) fining of the bed surface, and (d) continuous formation and collapse of steps. In between pulses, the bed surface coarsened, and bedload transport rates dropped by several orders of magnitude. Steps continuously formed and collapsed during and shortly after the pulses, but their stability increased when the sediment feed was turned off. High pulse magnitude enhanced step formation, while low pulse frequency (i.e., long interpulse period) enhanced step stability. We back-calculated the threshold for motion based on measured bedload transport rates and bed shear stress. Changes in the threshold for motion were much larger than changes in bed surface slope. By accounting for energy dissipation through the effective slope based on flow resistance partitioning, a better prediction was obtained. The threshold for motion decreased following sediment pulses then increased immediately after and fluctuated until the next sediment pulse. Our results indicate that longitudinal width variations and episodic sediment supply are primary controls on the evolution of step-pool channels. Sediment feed magnitude affects mostly morphological changes, while sediment feed frequency controls channel stability. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/333737 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Jiamei Wang,Marwan A. Hassan,Matteo Saletti,et al. On how episodic sediment supply influences the evolution of channel morphology, bedload transport and channel stability in an experimental step-pool channel[J]. Water Resources Research,2021. |
APA | Jiamei Wang.,Marwan A. Hassan.,Matteo Saletti.,Xingyu Chen.,Xudong Fu.,...&Xingguo Yang.(2021).On how episodic sediment supply influences the evolution of channel morphology, bedload transport and channel stability in an experimental step-pool channel.Water Resources Research. |
MLA | Jiamei Wang,et al."On how episodic sediment supply influences the evolution of channel morphology, bedload transport and channel stability in an experimental step-pool channel".Water Resources Research (2021). |
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