DOI: 10.5194/hess-21-3221-2017
Scopus记录号: 2-s2.0-85021626057
论文题名: Slope-velocity equilibrium and evolution of surface roughness on a stony hillslope
作者: Nearing M ; A ; , Polyakov V ; O ; , Nichols M ; H ; , Hernandez M ; , Li L ; , Zhao Y ; , Armendariz G
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 6 起始页码: 3221
结束页码: 3229
语种: 英语
Scopus关键词: Hydraulic fluids
; Rain
; Runoff
; Velocity
; Artificial rainfall
; Controlled conditions
; Discharge rates
; Hydraulic equations
; Hydraulic roughness
; Overland flow rates
; Rainfall intensity
; Surface conditions
; Surface roughness
; discharge
; equation
; equilibrium
; flow velocity
; geomorphology
; hillslope
; hydraulics
; overland flow
; physical property
; precipitation intensity
; rainfall
; runoff
; slope
; surface roughness
英文摘要: Slope-velocity equilibrium is hypothesized as a state that evolves naturally over time due to the interaction between overland flow and surface morphology, wherein steeper areas develop a relative increase in physical and hydraulic roughness such that flow velocity is a unique function of overland flow rate independent of slope gradient. This study tests this hypothesis under controlled conditions. Artificial rainfall was applied to 2m by 6m plots at 5, 12, and 20% slope gradients. A series of simulations were made with two replications for each treatment with measurements of runoff rate, velocity, rock cover, and surface roughness. Velocities measured at the end of each experiment were a unique function of discharge rates, independent of slope gradient or rainfall intensity. Physical surface roughness was greater at steeper slopes. The data clearly showed that there was no unique hydraulic coefficient for a given slope, surface condition, or rainfall rate, with hydraulic roughness greater at steeper slopes and lower intensities. This study supports the hypothesis of slope-velocity equilibrium, implying that use of hydraulic equations, such as Chezy and Manning, in hillslope-scale runoff models is problematic because the coefficients vary with both slope and rainfall intensity. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79134
Appears in Collections: 气候变化事实与影响
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作者单位: USDA-Agricultural Research Service, Southwest Watershed Research Center, Tucson, AZ, United States; School of Natural Resources and the Environment, University of Arizona, Tucson, AZ, United States
Recommended Citation:
Nearing M,A,, Polyakov V,et al. Slope-velocity equilibrium and evolution of surface roughness on a stony hillslope[J]. Hydrology and Earth System Sciences,2017-01-01,21(6)