Field observations of the vertical distribution of sand transport characteristics over fine, medium and coarse sand surfaces

2016 ◽  
Vol 42 (6) ◽  
pp. 889-902 ◽  
Author(s):  
ZhengCai Zhang ◽  
ZhiBao Dong ◽  
GuangQiang Qian
Keyword(s):  
Vertical Distribution ◽  
Coarse Sand ◽  
Sand Transport ◽  
Field Observations ◽  
The Vertical Distribution

scholarly journals BLOWN SAND ON BEACHES

1982 ◽  
Vol 1 (18) ◽  
pp. 73
Author(s):  
Susumu Kubota ◽  
Kiyoshi Horikawa ◽  
Shintaro Hotta
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Vertical Distribution ◽  
Shear Velocity ◽  
Wind Tunnel Experiment ◽  
Transport Rate ◽  
Sand Transport ◽  
Sand Transport Rate ◽  
Empirical Coefficients ◽  
The Vertical Distribution

The blown sand transport rate and the vertical and shore-normal distributions of the wind speed were measured simultaneously on a windy beach. The sand transport rate was measured with conventional total quantity-type traps and with a large trap in the form of a trench. The vertical distribution of the wind speed was measured using an ultrasonic anemometer array consisting of six meters. The distribution of wind speed at a height of 1 m in a section normal to the shoreline was measured with five ultrasonic anemometers. A logarithmic law for the vertical distribution of the wind speed was satisfied, and the wind speed in the section normal to the shoreline was almost constant. The Kawamura and Bagnold formulae were found to predict well the sand transport rate. The trench trap and conventional traps gave empirical coefficients of 1.5 and 1.0, respectively, for the sand transport rate averaged over a section normal to the shoreline. The lower value determined with the conventional traps (1.0) is attributed to their inefficiency compared with the trench trap. In order to obtain data at high shear velocities, a wind tunnel experiment was carried out. This experiment showed that both the Kawamura and Bagnold formulae were valid in the range between 60 to 300 cm/s in the wind shear velocity. The empirical coefficient in the laboratory experiments was 1.0: the difference between the field result with the trench trap and the wind tunnel experiment is attributed to the fluctuations in natural wind.

The vertical distribution of thin features over the Arctic analysed from CALIPSO observations. Part I: Optically thin clouds

Tellus B ◽  
2011 ◽  
Vol 63 (1) ◽  
Author(s):  
Abhay Devasthale ◽  
Michael Tjernström ◽  
Karl-Göran Karlsson ◽  
Manu Anna Thomas ◽  
Colin Jones ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
The Arctic ◽  
The Vertical Distribution
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