Response of roll wave to suspended load and hydraulics of overland flow on steep slope

Zhao, Chunhong; Gao, Jianen; Zhang, Mengjie; Zhang, Tong; Wang, Fei

doi:10.1016/j.catena.2015.06.010

Cited by 14 publications

(13 citation statements)

References 24 publications

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“…Julien and Hartley (1986) also found the roll wave in the laminar critical flow with a Froude number as low as 0.74 (Pan and Shangguan 2009). In recent years, the impact of the roll wave on the erosion of slope soils has received increasing attention (Zhao et al 2015;Ivanova et al 2017). Pan and Shangguan (2009) indicated that the rainfall and slope can affect the development of roll waves.…”

Section: Introductionmentioning

confidence: 99%

“…Many factors affect overland flow under natural conditions; in addition, mass and momentum sources continuously join the flow path, making it difficult to quantitatively describe the flow on slopes. Because of different experimental conditions, researchers (Woolhiser et al 1970;Kirkby 1978;Govers 1992;Nearing et al 1997;Zhao et al 2015) still disagree about the basic hydrodynamic characteristics (flow state, mean velocity, and resistance characteristics) of the overland flow. The erosion of sandy slopes in the loess plateau of the northern Shaanxi area of China is of serious concern, and the slopes are relatively flat in the ecotone between the areas that experience wind erosion and water erosion.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang (2011) found, through fixedbed flume tests, that with the increased discharge per unit width (i.e., the increase in the water depth), the instability of the water surface and the quenching of roll waves occur in flows on slopes. Zhao et al (2015) investigated the response of the roll wave to the sediment concentration and surface hydraulics on a steep slope. Ivanova et al (2017) compared simulation results with experimental results and found that the resulting free surface profiles matched well; additionally, the transmission of energy formed a regular rollwave train.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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We used a fixed-bed flume test and ultrasonic sensor measurement technology to study the evolution of the characteristics of thin-layer flow roll waves on a sloped surface. The results indicated that there was a positive correlation between the velocity of the roll wave and the Reynolds number when the energy slope and roughness were small. In addition, the amplitude of the increase gradually decreased with increases in roughness, and the height of the roll waves showed a single-hump trend of change. When the roughness was relatively small, the frequency of the roll waves increased as the Reynolds number increased, and the ratio of the wavelength to the water depth gradually decreased. As the energy slope increased, both the wave velocity and frequency of the roll waves gradually increased; they peaked when the energy slope was 0.3420. We found that the dominant factors that affected different roll-wave characteristic parameters varied. The roughness of the bed had a relatively prominent impact on the velocity of the roll waves, but the energy slope had a greater effect on the height of the roll waves.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…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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“…Compared with an open channel, an overland flow with a shallow water depth is more prone to produce roll waves (Wang et al, 2021; Zhang et al, 2011). One study showed that roll waves in overland flow promote soil erosion (Zhao et al, 2015). Roll waves lead to an instantaneous increase in flow energy, contributing to a large portion of the total kinetic energy of the flow, enhancing sediment transport, and accelerating the development of soil sheet erosion to gully erosion (Liu et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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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Response of roll wave to suspended load and hydraulics of overland flow on steep slope

Cited by 14 publications

References 24 publications

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

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

Roll waves and their generation criteria

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

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