不同防沙措施的风沙流及其携沙粒度垂直分异特征

doi:10.12118/j.issn.1000-6060.2021.580

Abstract

Abstract:

In order to reveal the characteristics of wind-sand flow and sand-carrying grain size, four types of sand control measures were implemented: checkered sand barriers, single- and double-row sand barriers, and retaining walls made of wood and nylon net. Wind tunnel experiments were carried out at Key Laboratory Desert and Desertification, Chinese Academy of Sciences, Lanzhou City, Gansu Province, China to measure the aeolian flow before and after intervention, and the particle size composition of sand samples was analyzed using a Mastersizer3000 laser particle size distributor. The results show that: (1) the vertical distribution of wind-sand flow with the use of various measures was similar to observations made prior to intervention. Sediment transport increased with increases in height, and more than 88% of the sediment transport was concentrated within the 0-10 cm height layer. Also, leeward side with high-sediment discharge performance first increased and then decreased. It also increased with a decrease in the barrier size, height, line spacing of the narrowing, and porosity, and gradually reduced the upward migration of the sediment discharge concentration. Furthermore, the peak value of sediment transport shifted from the relatively low barrier-type drafty squares (7 cm), upward to the relatively high tight sand retaining wall (26 cm). Moreover, the sediment deposition of the 0-10 cm layer near the surface was less. (2) Affected by the various sand prevention measures, significant differences were found in various levels of sand grain size characteristics and the overall average particle size of sand showed decreases with the increase in height, the change rule of fine sand and sand was mainly distributed in the near surface 5-25 cm layer. Meanwhile, the near surface layer 0-5 cm distribution of fine sand, medium sand, and coarse sand, had a peak value of about 0.300 mm, and the average content was about 12.09%. Smaller grain size parameters were affected by the measured specification changes; the kurtosis changes from wide and flat to medium and narrow with the densification of measured parameters; the change from checkered sand barrier (0.990), single-row sand barrier (0.990), double-row sand barrier (0.996) to sand retaining wall (1.086); and the above change law gradually increased with the increase in indicated wind speed.

Key words: wind profile, wind-sand flow, vertical distribution of grain size, sand prevention technology measures

YAN Min,ZUO Hejun,JIA Guangpu,XI Cheng. Vertical distribution characteristics of wind-sand flow and its grain size under different sand control measures[J].Arid Land Geography, 2022, 45(5): 1513-1522.

Figures/Tables 6

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Tab. 1

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References 30

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序号	防沙措施	高度/cm	规格	行间距	风向夹角/(°)	雷诺数
1	方格沙障	3	10 cm×10 cm、15 cm×15 cm、20 cm×20 cm	-	-	3.87×10⁵~6.78×10⁵
2	单行沙障	6、8、10、12	-	-	-	3.84×10⁵~6.72×10⁵
3	双行沙障	10	-	4H、8H、12H	-	3.84×10⁵~6.72×10⁵
4	挡沙墙	10	-	-	45、60、75、90	3.87×10⁵~6.78×10⁵

Vertical distribution characteristics of wind-sand flow and its grain size under different sand control measures

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