Evolution Rules of Rolling Waves on Slopes Based on Artificial Flat Slopes of Loess

Yang, Minghao; Gong, Jiaguo; Zhao, Yong; Wang, Hao; He, Xiaohui; Zhao, Cuiping

doi:10.1061/(asce)he.1943-5584.0001899

Cited by 4 publications

(2 citation statements)

References 15 publications

(23 reference statements)

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“…This work mainly studied the variation in wave height in the absence of rainfall. The data in Table 3 show that the wave height of each section decreased with the bed roughness, consistent with the results of Meng et al (2020) and Yang et al (2020). This may be due to the blocking effect of the bed surface with increasing bed roughness, causing the wave height to decrease and the mean flow depth to increase gradually.…”

Section: Discussionsupporting

confidence: 90%

An experimental study on the evolution law of roll wave parameters in overland flow

Fang¹,

Pan²,

Zhang

et al. 2021

Hydrological Processes

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Roll waves commonly occur in overland flow and have an important influence on the progress of soil erosion on slopes. This study aimed to explore the evolution and mechanism of roll waves on steep slopes. The potential effects of flow rate, rainfall intensity and bed roughness on the laws controlling roll wave parameters were investigated. The flow rates, rainfall intensities and bed roughness varied from 5 to 30 L/min, 0 to 150 mm/h, and 0.061 to 1.700 mm, respectively. The results indicate that roll waves polymerize significantly along the propagation path, and bed roughness and rainfall affect the generation and evolution of roll waves. The wave velocity, length and height decreased with bed roughness, whereas the wave frequency increased with increasing bed roughness under fixed flow rate and rainfall intensity conditions. Rainfall increased the wave velocity and wavelength and decreased the wave frequency. The wave velocity, height and wavelength tended to increase with an increasing flow rate. Rainfall promoted the generation of roll waves, whereas bed roughness had the opposite effect. The generation of roll waves is closely related to the Froude number (Fr) and flow resistance. In this experiment, the range of the Reynolds number for the roll waves generated in the laminar region was 142–416, and the range of the flow resistance coefficient was 0.64–4.85. The critical value of the Fr for flow instability in the laminar region was approximately 0.57. Exploring the generation and evolution law of roll waves is necessary for understanding the processes and dynamic mechanisms of slope soil erosion.

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Section: Discussionsupporting

confidence: 90%

An experimental study on the evolution law of roll wave parameters in overland flow

Fang¹,

Pan²,

Zhang

et al. 2021

Hydrological Processes

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show abstract

“…Although in reduced numbers, roll wave studies concerning both laminar and turbulent regimes have been experimentally carried out (Brock, 1969;Tamburrino & Ihle, 2013;Fiorot et al, 2015;Maciel et al, 2017;Zhao et al, 2015;Aranda et al, 2016;Miao et al, 2020;Fei et al, 2021). Works based on mathematical and numerical modelling, on the other hand, are more frequent in the literature (Zanuttigh & Lamberti, 2002;Gao et al, 2003;Balmforth & Liu, 2004;Di Cristo & Vacca, 2005;Maciel et al, 2013;Ferreira et al, 2014;Cao et al, 2015;Ivanova et al, 2017;Maciel et al, 2018;Kan et al, 2018;among others).…”

Section: /18mentioning

confidence: 99%

Roll waves and their generation criteria

Ferreira

Maciel

Pereira

2021

RBRH

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Pulsating waves (also known as roll waves) might occur on the free surface of extreme events like mud and debris flows, among others, usually intensifying the caused damage. This technical note aims to inform about the roll wave phenomenon developing in a free-surface laminar flow, and analyze its generation criteria, centered on the concepts of Froude number and disturbance frequency. The complete linear stability analysis of the new depth-averaged model was proven a useful theoretical tool in determining new generation criteria for roll waves developing in non-Newtonian fluids. The results showed that the roll wave generation depends on two criteria: the first is associated to the minimum Froude number, and the second is related to the cut-off frequency. In addition, we have confirmed that the new generation criteria can be verified via numerical simulation based on a second model with full equations (Fluent software). Globally, the emergence of roll waves is favored by the non-Newtonian properties of the flowing fluid and the fact that the cut-off frequency decreases along with the minimum Froude number. Lastly, both generation criteria were tested in order to examine a case study involving the occurrence of roll waves in a watershed.

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Absorbance photometric technique to measure roll waves in a free surface of a non-Newtonian fluid flow

da Cunha,

de Oliveira Ferreira,

de Freitas Maciel

et al. 2024

Measurement

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Evolution Rules of Rolling Waves on Slopes Based on Artificial Flat Slopes of Loess

Cited by 4 publications

References 15 publications

An experimental study on the evolution law of roll wave parameters in overland flow

An experimental study on the evolution law of roll wave parameters in overland flow

Roll waves and their generation criteria

Absorbance photometric technique to measure roll waves in a free surface of a non-Newtonian fluid flow

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