Impacts of headcut height on flow energy, sediment yield and surface landform during bank gully erosion processes in the Yuanmou Dry‐hot Valley region, southwest China

Zhang, Baojun; Xiong, Donghong; Zhang, Guanghui; Zhang, Su; Wu, Han; Yang, Dan; Xiao, Liang; Dong, Yifan; Su, Zhengan; Lü, Xianguo

doi:10.1002/esp.4388

Cited by 33 publications

(31 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This study showed that the sediment discharge increased at the initial time, then gradually decreased, and finally reached a steady-state condition, which is consistent with the results of Zhang, Wang, et al (2018); Zhang, Xiong, et al (2018), who reported on gullies in the dryhot valley region. The reason for the time variation may be as follows:…”

Section: Sediment Characteristics Of Headcut Erosionsupporting

confidence: 91%

“…Vortex or cyclic waves existed in the plunge pool (Obiechefu, 2014) and thus increased the flow turbulence. An irregularity in v was also detected by Obiechefu (2014) sumption on the gully head was much higher than that on the catchment area and gully bed (Zhang, Wang, et al, 2018;Zhang, Xiong, et al, 2018). Therefore, the flow velocty and flow energy in the catchment area was higher than that in the gully bed.…”

Section: Sediment Dischargementioning

confidence: 74%

“…Therefore, the responses of hydraulic characteristics to soil erosion have received considerable attention in the scientific literature worldwide. Some researchers have introduced flow energy, such as kinetic energy, potential energy, and flow energy consumption to illustrate headcut erosion mechanisms (Su et al, 2015;Zhang et al, 2016;Zhang, Xiong, et al, 2018). However, the object in these studies mainly focused on slope erosion or watersheds.…”

Section: Introductionmentioning

confidence: 99%

“…The physiographical factors include the initial step height (Bennett & Casalí, 2001;Zhang et al, 2016;, bed slope (Bennett, 1999), land use (Guo et al, 2018), and soil bed material (Babazadeh, Ashourian, & Shafai-Bajestan, 2017;Bennett, Alonso, Prasad, & Mathias, 2000;Wells, Bennett, & Alonso, 2009). Soil loss usually increases with increasing slope gradient and initial headcut height (Su et al, 2014(Su et al, , 2015Zhang, Wang, Wu, Shen, & Liu, 2018;Zhang, Xiong, et al, 2018). Land use and soil bed material affect soil erosion by affecting soil erodibility (Bennett et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The impact of flow discharge on the hydraulic characteristics of headcut erosion processes in the gully region of the Loess Plateau

Shi

Wang

Chen

et al. 2019

Hydrological Processes

View full text Add to dashboard Cite

Headcut erosion is associated with major hydraulic changes induced by the gully head of concentrated flow. However, the variation in the hydraulic characteristics of the headcut erosion process is still not clear in the gully region of the Loess Plateau.A series of rainfall combined scouring experiments (flow discharges ranging from 3.6 to 7.2 m 3 hr −1 , with 0.8 mm min −1 rainfall intensity) were conducted on experimental plots to clarify the variation in the hydraulic parameters induced by gully head and erosion processes under different flow discharges. The results showed that concentrated flows in the catchment area and gully bed were turbulent (Reynolds number ranging from 1,876 to 6,693) and transformed between supercritical and subcritical (Froude number ranging from 0.96 to 3.73). The hydraulic parameters, such as the flow velocity, Reynolds number, shear stress, stream power, Darcy-Weisbach friction factor, and unit stream power in the catchment area were 0.45-0.59 m s −1 , 2086-6693, 1.96-5.33 Pa, 0.89-2.86 W m −2 , 0.08-0.16, and 0.023-0.031 m s −1 ,respectively. When the concentrated flows dropped from the gully head, the hydraulic parameters in the gully bed decreased by 3., respectively, which contributed to the flow energy consumption at the gully head. As flow discharge increased, Reynolds number, shear stress, and stream power increased, while flow velocity, Froude number, unit stream power, and Darcy-Weisbach friction factor did not. The flow energy consumption at the gully head was 9. 66-10.13, 13.25-13.74, 15.68-16.41, and 19.28-20.25 J s −1 , respectively, under different flow discharges and accounted for 60.58-68.50% of the flow energy consumption of the experimental plots. Generally, the sediment discharges increased rapidly at the initial stage, then increased slowly, and finally reached a steady state condition, which showed a significant declining logarithmic trend with experimental duration (P<.01) and increased with increasing flow discharge. Accordingly, the flow energy consumption was significantly correlated with the sediment yield. These findings could improve our understanding of the hydraulic properties and flow energy characteristics of headcut erosion.

show abstract

Section: Sediment Characteristics Of Headcut Erosionsupporting

confidence: 91%

Section: Sediment Dischargementioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The impact of flow discharge on the hydraulic characteristics of headcut erosion processes in the gully region of the Loess Plateau

Shi

Wang

Chen

et al. 2019

Hydrological Processes

View full text Add to dashboard Cite

show abstract

“…These models employ conservation equations, fluvial (advective) processes, mass‐wasting (diffusive or discrete) processes, and various criteria for the initiation of a channel that could migrate upstream with time (De Ploey, ; Willgoose et al, , Willgoose et al, ; Howard, , ; Bull and Kirkby, ; Sidorchuk and Sidorchuk, ; Kirkby and Bull, ; Sidorchuk, ). Recent landscape evolution models now include a gully headcut advance mechanism that considers the combined effects of plunge‐pool scour and mass failure (Alonso et al, ; Istanbulluoglu et al, ; Flores‐Cervantes et al, ; Rengers and Tucker, , ; Allen et al, ), which have been supported by specially‐designed experiments (Zhang et al, ). As noted by Vanmaercke et al .…”

Section: The Global Impact Of Gully Erosion and The Urgency For Technmentioning

confidence: 99%

Gully erosion processes, disciplinary fragmentation, and technological innovation

Bennett

Wells

2018

Earth Surf Processes Landf

View full text Add to dashboard Cite

The development and evolution of gullies on soil‐mantled hillslopes can devastate agricultural regions and cause widespread soil and landscape degradation. Since 2000, international symposia have been organized to address gully erosion processes, and this paper and special issue provide additional context for the 7th International Symposium on Gully Erosion held at Purdue University in 2016. Several important themes of gully erosion emerged during this symposium that warranted additional discussion here. These topics include the importance and impact of technology transfer, disciplinary fragmentation as an impediment for research advancement, the difficulty in defining the erodibility of sediment within gullies, and the opportunities afforded by remote sensing technology. It is envisioned that such symposia will continue to enhance the capabilities of researchers and practitioners to monitor, model, and manage these important geomorphic processes and to mitigate landscape degradation. © 2018 John Wiley & Sons, Ltd.

show abstract

Dynamics of run‐off hydraulic characteristics during gully headcut erosion driven by head height

Tang,

Liao,

Lin

et al. 2023

Earth Surf Processes Landf

View full text Add to dashboard Cite

In the granitic red soil hills region of South China, gully headcut erosion is considered one of the main processes in the development of gullies. However, the dynamics of run‐off hydraulic characteristics such as hydrodynamics and energy consumption during erosion have not been clarified. We investigated the effects of five headcut heights (25 to 125 cm) on hydrodynamic and energy consumption characteristics using field in situ water discharge scouring experiments. The results demonstrated that the flow velocity (V), Froude number (Fr), Reynolds number (Re), run‐off shear (τ) and run‐off power (ω) all indicate the upstream area (UA) > gully bed (GB). Except for V and Fr, several other hydraulic parameters exhibited a trend of sandy soil layer > red soil layer, and a fluctuating increase with increasing headcut height was observed in the GB. The jet velocity at the edge of the headcut (Vb), jet shear stress (τj), potential energy conversion (∆EP) and bottoming instantaneous kinetic energy (EKbottom) all increased exponentially with increasing headcut height by factors of 1.10 to 1.37, 1.16 to 2.00, 1.07 to 2.06 and 1.22 to 1.86, respectively. Except for ∆EP, all others performed a trend of sandy soil layer > red soil layer. The energy consumption at the gully head (∆EH) and its contribution tended to significantly increase with increasing headcut height, and the ∆EH of sandy soil layer was 13.20% to 49.89% higher than that of red soil layer. When the headcut height was greater than 100 cm, the contribution of energy consumption exceeded 50%. In addition, the sediment deposition process throughout the system was significantly influenced by the hydraulic and jet characteristics, and energy consumption was positively correlated with soil loss. The study results contribute to a profound understanding of gully headcut erosion and its hydrodynamic mechanisms.

show abstract

Impacts of headcut height on flow energy, sediment yield and surface landform during bank gully erosion processes in the Yuanmou Dry‐hot Valley region, southwest China

Abstract: The cover image, by Baojun Zhang et al., is based on the Research Article Impacts of headcut height on flow energy, sediment yield and surface landform during bank gully erosion processes in the Yuanmou Dry-hot Valley region, southwest China, https://doi.

Cited by 33 publications

References 42 publications

The impact of flow discharge on the hydraulic characteristics of headcut erosion processes in the gully region of the Loess Plateau

The impact of flow discharge on the hydraulic characteristics of headcut erosion processes in the gully region of the Loess Plateau

Gully erosion processes, disciplinary fragmentation, and technological innovation

Dynamics of run‐off hydraulic characteristics during gully headcut erosion driven by head height

Contact Info

Product

Resources

About