Effect of plant basal cover on velocity of shallow overland flow

Fu, Suhua; Mu, Hongli; Liu, Baoyuan; Yu, Xianju; Liu, Yingna

doi:10.1016/j.jhydrol.2019.123947

Cited by 21 publications

(22 citation statements)

References 27 publications

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“…and NSE values ( Figure 6). This finding again indicates the usability and rationality of the structure of Equations (3) and (4) proposed by Fu et al (2019).…”

Section: Quantitative Relationships Between Litter and Stem Cover Asupporting

confidence: 63%

“…Manning's roughness coefficient equation. Petryk and Bosmajian (1975) and Jin et al (2000) The general form of Manning's roughness coefficient and flow velocity equations can be expressed as follows (Fu et al, 2019):…”

Section: Introductionmentioning

confidence: 99%

“…They found that the latter component was related to vegetation density and flow depth and played a major role in the variation in flow resistance. Based on the structure of Manning's equation, Fu et al (2019) derived a new equation for calculating the Manning's roughness coefficient which was suitable for describing the flow velocity on vegetation stem‐covered slopes. Similarly, Fu's equation also reflected the influence of boundary resistance and plant stem resistance, and the flow resistance from vegetation was proportional to the plant stem cover and flow depth.…”

Section: Introductionmentioning

confidence: 99%

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Hydraulic properties affected by litter and stem cover under overland flow

Ding

Zhao

2021

Hydrological Processes

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Vegetation stems and litter cover have different effects on sediment transport capacity under the same experimental conditions, which in essence, may be due to differences in their hydraulic properties, but the availability of comparative studies is limited. This study aimed to compare the hydraulic properties affected by litter and stem cover, compare differences in the drag forces exerted by litter and stems on overland flow, and develop new Manning's n and flow velocity equations for litter cover. Two series of flume experiments were conducted with the same slope gradients (8.8%, 17.6%, 26.8%) and flow discharge rates (0.5, 1.0 × 10 −3 m 3 s −1). Artificial Gramineae stems with a 0%-30% cover level and Pinus tabulaeformis litter with a 0%-70% cover level were used in series 1 and series 2, respectively. The flow veloc

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“…and NSE values ( Figure 6). This finding again indicates the usability and rationality of the structure of Equations (3) and (4) proposed by Fu et al (2019).…”

Section: Quantitative Relationships Between Litter and Stem Cover Asupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydraulic properties affected by litter and stem cover under overland flow

Ding

Zhao

2021

Hydrological Processes

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“…Degree of vegetation stem cover, stem diameter, and arrangement all affect hydraulic variables and the sediment transport capacity (Fu, Mu, Liu, Yu, & Liu, 2019; Fu, Mu, Liu, Yu, Zhang, & Liu, 2019; Mu et al, 2019a, 2019b). However, few studies have systematically considered the effect of stem cover, stem diameter, and arrangement on the relationship between hydraulic variables and the sediment transport capacity.…”

Section: Introductionmentioning

confidence: 99%

“…An overwhelming body of evidence from the laboratory and in the field has indicated that the sediment transport capacity would decrease markedly with vegetation cover (Kindiye et al, 2018; Mu et al, 2019a). It is postulated in this article that as flow resistance is increased, and velocity decreased with vegetation cover (Fu, Mu, Liu, Yu, & Liu, 2019), cover would have no explicit effect on the sediment transport capacity if flow velocity is used as one of its predictors. Thus, it is hypothesized that we could have a single equation using the flow velocity as one of the independent variables to estimate the sediment transport capacity for situations with and without vegetation cover.…”

Section: Introductionmentioning

confidence: 99%

Predicting the sediment transport capacity from flow condition and particle size in the presence of vegetation cover

et al. 2020

Land Degrad Dev

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The sediment transport capacity plays a pivotal role in erosion research, and is usually predicted using hydraulic variables. The transport capacity and hydraulic variables are affected by vegetation cover. Our understanding of the effect of vegetation cover, including the size, density, and arrangement of vegetation stems, on the relationship between the sediment transport capacity and hydraulic variables were rather limited. The objectives of this study were to investigate the effect vegetation stem cover on the relationship between hydraulic variables and the sediment transport capacity and to derive an equation for predicting the sediment transport capacity in the presence of vegetation cover. Five data sets from 288 flume experiments with a wide range of discharge (0.25–2 × 10−3 m3 s−1), slope (8.8–42.3%), median sediment diameter (0.11–1.16 × 10−3 m), stem cover (0–30%), stem diameter (2–36 mm), and stem arrangement (bead, tessellation, zigzag, random, and banding) were compiled for this study. Extensive regression analysis has shown that the sediment transport capacity could be expressed as a power function of flow velocity, shear stress, stream power, or unit stream power. Predictors of the sediment transport capacity were ranked from the unit stream power as the strongest, followed by the stream power, flow velocity, and the shear stress. Vegetation stem cover had no apparent and direct effect on the relationship between hydraulic variables and the sediment transport capacity so long as the unit stream power or stream power was used as its predictor. Vegetation cover became a significant factor only when the shear stress was used to predict the sediment transport capacity. Finally, a new equation involving the slope gradient, flow velocity, and median sediment diameter in a nondimensional form was shown to be a superior predictor of the sediment transport capacity with the Nash–Sutcliffe coefficient of efficiency of 0.92. The product of slope and flow velocity, that is, the unit stream power, captures the effect of vegetation stem cover and surface roughness and was shown to be an effective predictor of the transport capacity in the presence of vegetation cover.

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Correction factor for determining mean velocity of shallow flow on rough surfaces under varying inundation conditions using dye tracer method

Fan

Jia

et al. 2023

Earth Surf Processes Landf

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Accurate estimation of mean flow velocity is crucial for hydraulics and soil erosion studies. A correction factor (α) is required to convert flow surface velocity to mean velocity when using the dye tracer method. However, the determination of an appropriate α value is challenging and little information is available about how α varies with progressive inundation conditions, especially for rough surfaces with protruding roughness elements (e.g., stones). Therefore, laboratory experiments were conducted in a flume with sandpaper (SD) and stones (ST) surfaces to investigate the impact of roughness elements on the correction factor with varying inundation conditions. The results showed that using a single α value is inappropriate for rough surfaces. The correction factor was positively correlated with the Reynolds number and is controlled by flow regimes as well. Moreover, the impacts of inundation conditions as well as protruding roughness elements should be taken into account for determining α. Correction factor varied non‐monotonically with inundation ratio, depending on the progressive inundation status of protruding roughness elements. The developed equations introducing the inundation ratio performed well in predicting α, with R2 = 0.86 and NSE = 0.91. The results contribute to our understanding of measuring mean flow velocity using the dye tracer method.

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Effect of plant basal cover on velocity of shallow overland flow

Cited by 21 publications

References 27 publications

Hydraulic properties affected by litter and stem cover under overland flow

Hydraulic properties affected by litter and stem cover under overland flow

Predicting the sediment transport capacity from flow condition and particle size in the presence of vegetation cover

Correction factor for determining mean velocity of shallow flow on rough surfaces under varying inundation conditions using dye tracer method

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