Experimental investigation on trap stagnant effect and sand flux in aeolian sand transport

Gu, Zhonghua; Guo, Liejin

doi:10.1016/j.physleta.2007.04.049

Cited by 8 publications

(6 citation statements)

References 24 publications

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“…Specifically, they argue that the characteristic decay length, l, should be proportional to u * flux profile as transport intensity varies. Gu and Guo [2007] (Figure 8) present vertical flux profiles from wind-tunnel experiments that show this trend nicely, as do Ni et al [2002] (Figure 7).…”

Section: Introductionmentioning

confidence: 66%

“…Flow compression up the windward side of the dune leading to near‐surface overspeed regions at the crest may have significant ramifications for the shape of these particle flux profiles and the overall structure of saltation layers. Nevertheless, the general trends shown in Figures and are not unlike those described by other researchers [e.g., Williams , ; Rasmussen and Mikkelsen , ; Li and Ni , ; Gu and Guo , ; Xing , ; Ellis et al ., ; Dong et al ., ; Rotnicka , ] in the sense that the profiles can be well described statistically by an exponential decay function (equation ), despite having a prominent foot region.…”

Section: Resultsmentioning

confidence: 99%

“…Under this formulation, the decay length should increase with an increase in u * , which implies continuous change in the gradient of the normalized flux profile as transport intensity varies. Gu and Guo [] (Figure ) present vertical flux profiles from wind‐tunnel experiments that show this trend nicely, as do Ni et al . [] (Figure ).…”

Section: Introductionmentioning

confidence: 99%

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Aeolian particle flux profiles and transport unsteadiness

Bauer

Davidson‐Arnott

2014

JGR Earth Surface

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Vertical profiles of aeolian sediment flux are commonly modeled as an exponential decay of particle (mass) transport with height above the surface. Data from field and wind-tunnel studies provide empirical support for this parameterization, although a large degree of variation in the precise shape of the vertical flux profile has been reported. This paper explores the potential influence of wind unsteadiness and time-varying intensity of transport on the geometry (slope, curvature) of aeolian particle flux profiles. Field evidence from a complex foredune environment demonstrates that (i) the time series of wind and sediment particle flux are often extremely variable with periods of intense transport (referred to herein as sediment "flurries") separated by periods of weak or no transport; (ii) sediment flurries contribute the majority of transport in a minority of the time; (iii) the structure of a flurry includes a "ramp-up" phase lasting a few seconds, a "core" phase lasting a few seconds to many tens of seconds, and a "ramp-down" phase lasting a few seconds during which the system relaxes to a background, low-intensity transport state; and (iv) conditional averaging of flux profiles for flurry and nonflurry periods reveals differences between the geometry of the mean profiles and hence the transport states that produce them. These results caution against the indiscriminate reliance on regression statistics derived from time-averaged sediment flux profiles, especially those with significant flurry and nonflurry periods, when calibrating or assessing the validity of steady state models of aeolian saltation.

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Section: Introductionmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

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Aeolian particle flux profiles and transport unsteadiness

Bauer

Davidson‐Arnott

2014

JGR Earth Surface

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“…Several attempts had also been made to design passive or active sediment traps for direct measurements of wind erosion in both field and wind tunnel studies (Bagnold, 1941;Bagnold, 1954;Leatherman, 1978;De Ploey, 1980;Gillette and Walker, 1977;Wilson and Cooke, 1980;Fryrear, 1986;Spaan and Van den Abeele, 1991;Cornelis and Gabriels, 2003). Recently, Li and Ni (2003), Dong et al (2004) and Gu and Guo (2007) have made attempts to design lowcost passive traps. When compared to the active ones, the passive traps not only cost less but also are used more widely and in greater numbers and are easily distributed over a larger area.…”

Section: Introductionmentioning

confidence: 99%

Comparative efficiency testing for a newly designed cyclone type sediment trap for wind erosion measurements

et al. 2011

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“…Of these traps, the most common ones are BSNE (Big Spring Number Eight) and WAC (Wilson and Cooke) passive traps [20,21]. Several researchers worked with various traps by different aerodynamic designs and dimensions for actual wind erosion measurements and successfully modeled sediment flux and tried to explain both vertical and horizontal sediment transport characteristics [12,20–32]. Among those, to our knowledge, though, only a modified version of the WAC catcher was tested for the splash-saltation transport under WDR conditions in the ICE wind tunnel by [22].…”

Section: Introductionmentioning

confidence: 99%

Potential Use of BEST® Sediment Trap in Splash - Saltation Transport Process by Simultaneous Wind and Rain Tests

et al. 2016

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The research on wind-driven rain (WDR) transport process of the splash-saltation has increased over the last twenty years as wind tunnel experimental studies provide new insights into the mechanisms of simultaneous wind and rain (WDR) transport. The present study was conducted to investigate the efficiency of the BEST® sediment traps in catching the sand particles transported through the splash-saltation process under WDR conditions. Experiments were conducted in a wind tunnel rainfall simulator facility with water sprayed through sprinkler nozzles and free-flowing wind at different velocities to simulate the WDR conditions. Not only for vertical sediment distribution, but a series of experimental tests for horizontal distribution of sediments was also performed using BEST® collectors to obtain the actual total sediment mass flow by the splash-saltation in the center of the wind tunnel test section. Total mass transport (kg m-2) were estimated by analytically integrating the exponential functional relationship using the measured sediment amounts at the set trap heights for every run. Results revealed the integrated efficiency of the BEST® traps at 6, 9, 12 and 15 m s-1 wind velocities under 55.8, 50.5, 55.0 and 50.5 mm h-1 rain intensities were, respectively, 83, 106, 105, and 102%. Results as well showed that the efficiencies of BEST® did not change much as compared with those under rainless wind condition.

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Experimental investigation on trap stagnant effect and sand flux in aeolian sand transport

Cited by 8 publications

References 24 publications

Aeolian particle flux profiles and transport unsteadiness

Aeolian particle flux profiles and transport unsteadiness

Comparative efficiency testing for a newly designed cyclone type sediment trap for wind erosion measurements

Potential Use of BEST® Sediment Trap in Splash - Saltation Transport Process by Simultaneous Wind and Rain Tests

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