| Flow hydraulics in an ephemeral gully system under different slope gradients, rainfall intensities and inflow conditions |
| Ximeng Xu1,2; Fenli Zheng2 ; Glenn V. Wilson3
|
| 2021
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| 发表期刊 | Catena
 |
| 卷号 | 203期号:1页码:1-14 |
| 摘要 | Overland flow in an ephemeral gully (EG) system includes the EG channel, rill and interrill sheet flows, which
comprise an interconnected drainage network. There are abundant researches on the hydraulics of rill flow and
interrill sheet flow, as well as their relationships with soil detachment rates and sediment loads. Few studies have
quantified the flow hydraulics of EG system which is highly related to the EG erosion and the development of
better EG management strategies. Thus, two erosive rainfall intensities (50 and 100 mm h −1 ) and two slope
gradients (15 ◦ and 20 ◦ ) under different upslope and lateral inflow boundary conditions were employed to study
the flow hydraulics of an EG system using simulated rainfall and inflow experiments. The results showed that
flow velocity, shear stress, stream power and cross-sectional energy in the EG channel generally increased from
the top to bottom of the slope with different trends and fluctuations under various inflow conditions. The flow
hydraulic parameters of EG channel, rill, and interrill sheet flows all increased as rainfall intensity and slope
increased. Flow regimes in the EG system were divided based upon the Reynolds number and Froude number. EG
channel flow was classified as transitional to turbulent flow, rill flow was transitional, while sheet flows on
interrill areas was laminar. From sheet flow to rill flow and EG channel flow, the flow regime gradually shifted
from laminar and subcritical flow to turbulent and supercritical flow. The flow force, power and energy corre-
spondingly increase as flow regime changed toward turbulent and supercritical. Good relationships between
sediment load and flow hydraulic parameters were observed and flow shear stress was found to be best correlated
with soil erosion of the EG system (R 2 = 0.92). This study quantitively mapped the flow hydraulics in the EG
system and correlated these with erosion features, contributing to the development of process-based EG pre-
diction models and better EG management strategies. |
| 收录类别 | 中文核心期刊要目总览
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| 文献类型 | 期刊论文
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| 条目标识符 | sbir.nwafu.edu.cn/handle/361005/10711
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| 专题 | 水保所知识产出(1956---)
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| 作者单位 | 1.Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences
2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University
3.USDA-ARS National Sedimentation Laboratory
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推荐引用方式
GB/T 7714 |
Ximeng Xu,Fenli Zheng,Glenn V. Wilson. Flow hydraulics in an ephemeral gully system under different slope gradients, rainfall intensities and inflow conditions[J]. Catena,2021,203(1):1-14.
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| APA |
Ximeng Xu,Fenli Zheng,&Glenn V. Wilson.(2021).Flow hydraulics in an ephemeral gully system under different slope gradients, rainfall intensities and inflow conditions.Catena,203(1),1-14.
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| MLA |
Ximeng Xu,et al."Flow hydraulics in an ephemeral gully system under different slope gradients, rainfall intensities and inflow conditions".Catena 203.1(2021):1-14.
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