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Keywords
(9)
Arid Land
Curve Fitting
Drag Coefficient
Mass Conservation
Velocity Distribution
Wind Erosion
Wind Tunnel
Wind Velocity
Height Velocity
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Drag coefficients, roughness length and zeroplane displacement height as disturbed by artificial standing vegetation
Drag coefficients, roughness length and zeroplane displacement height as disturbed by artificial standing vegetation,10.1006/jare.2001.0807,Journal o
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Drag coefficients, roughness length and zeroplane displacement height as disturbed by artificial standing vegetation
(
Citations: 10
)
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Zhibao Dong
,
Shangyu Gao
,
Donald W. Fryrear
Standing vegetation, for its disturbance to the nearsurface airflow, is widely used in the arid and some semiarid lands over the world to control wind erosion. Knowledge of
drag coefficient
(CD), roughness length (Z0) and displacement height (D) is essential to completely define the state of wind and the protective role of standing vegetation in wind erosion. Using standing sticks as model standing vegetation, detailed
wind velocity
distributions were measured above the vegetated surface in wind tunnel, a
mass conservation
method to estimate the zeroplane displacement height was tried, and the drag coefficients and roughness length were derived by a curvefit method. Due to the disturbance of standing vegetation, the velocity distributions deviated from the logarithmic profile. The deviation increased with increasing vegetation density and height. The
wind velocity
profile disturbed by standing vegetation can be divided into three sections, and each section can be expressed by a logarithmic function. Displacement height is a significant parameter for tall and dense vegetation; choice of the value for displacement height greatly influences other parameters such as roughness length and drag coefficient, but its accurate value is not available yet. In the authors’ philosophy,
drag coefficient
and roughness length should be recommended. However, caution should also be taken in selecting the
wind velocity
measurements used to derive
drag coefficient
and roughness length. Both the height and density of standing vegetation influenced
drag coefficient
and roughness length, but their relative importance was different. A new parameter, effective lateral cover (Lec) was introduced to characterize the structure of standing vegetation. It was found that effective lateral cover and height/spacing ratio were better structural parameters than the others when the effects of standing vegetation on
drag coefficient
and roughness length were assessed. Good correlation existed between the derived roughness length and drag coefficient, implying that obtaining
drag coefficient
and roughness length of vegetated surface by curve fit method is reliable so long as caution is taken in selecting the appropriate measurements. Of the three parameters roughness length is the most sensitive to characterize the effects of roughness length on nearsurface airflow.
Journal:
Journal of Arid Environments  J ARID ENVIRON
, vol. 49, no. 3, pp. 485505, 2001
DOI:
10.1006/jare.2001.0807
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Citation Context
(2)
...To simplify the geometric characteristic of the vegetation, we consider the vegetation as a cylinder shaped object, as the method in [
22
]...
...According to the boundarylayer theory, the wellknown logarithmic wind profile on a neutrallystratified rough surface can be formulized as [
22
] [27]:...
...Considering the physical and mathematic reasons described in [
22
], and our motive is only visually correct, we further ignore zd and set it to zero, thusz0 is the only one to estimate...
Ning Wang
,
et al.
Aeolian Sand Movement and Interacting with Vegetation: A GPU Based Sim...
...Furthermore, replacement of palatable vegetation by unpalatable perennials or annuals under heavy grazing may possibly be retarded by positive feedback between decreasing vegetation volume and increasing wind erosion, such as wind erosion that fractures the vegetation cover (Armbrust and Retta 2000; Bielders et al. 2001) and vegetation that plays an important role in protecting topsoil against wind erosion (Bilbro and Fryrear 1994;
Dong et al. ...
Takehiro Sasaki
,
et al.
Can edaphic factors demonstrate landscapescale differences in vegetat...
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(22)
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Citations: 968
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L. J. Hagen
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Sort by:
Citations
(10)
Aeolian Sand Movement and Interacting with Vegetation: A GPU Based Simulation and Visualization Method
Ning Wang
,
BaoGang Hu
Conference:
International Symposium on Plant Growth Modeling and Applications  PMA
, 2009
Can edaphic factors demonstrate landscapescale differences in vegetation responses to grazing?
(
Citations: 9
)
Takehiro Sasaki
,
Tomoo Okayasu
,
Yasuhito Shirato
,
Undarmaa Jamsran
,
Satoru Okubo
,
Kazuhiko Takeuchi
Journal:
Plant Ecology  PLANT ECOL
, vol. 194, no. 1, pp. 5166, 2008
Form and function of grass ring patterns in arid grasslands: the role of abiotic controls
(
Citations: 7
)
Sujith Ravi
,
Paolo D’Odorico
,
Lixin Wang
,
Scott Collins
Journal:
Oecologia
, vol. 158, no. 3, pp. 545555, 2008
Estimation of surface roughness (z0) over a stabilizing coastal dune field based on vegetation and topography
(
Citations: 1
)
Noam Levin
,
Eyal BenDor
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Yaron Yaakov
Journal:
Earth Surface Processes and Landforms  EARTH SURF PROCESS LANDF
, vol. 33, no. 10, pp. 15201541, 2008
A twoconcentricloop iterative method in estimation of displacement height and roughness length for momentum and sensible heat
Wenguang Zhao
,
Russell J. Qualls
,
Pedro R. Berliner
Journal:
International Journal of Biometeorology  INT J BIOMETEOROL
, vol. 52, no. 8, pp. 849858, 2008