Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Analysis of Dust Flux and Sand Collection Efficiency of Wind Erosion near Surface Based on Field Observations

Version 1 : Received: 13 May 2021 / Approved: 14 May 2021 / Online: 14 May 2021 (14:45:47 CEST)

How to cite: Liu, X.; Kang, Y.; Chen, H.; Lu, H. Analysis of Dust Flux and Sand Collection Efficiency of Wind Erosion near Surface Based on Field Observations. Preprints 2021, 2021050341 (doi: 10.20944/preprints202105.0341.v1). Liu, X.; Kang, Y.; Chen, H.; Lu, H. Analysis of Dust Flux and Sand Collection Efficiency of Wind Erosion near Surface Based on Field Observations. Preprints 2021, 2021050341 (doi: 10.20944/preprints202105.0341.v1).

Abstract

The sand-dust horizontal flux is an important parameter for the study on aeolian sand transport, as well as an important foundation. In this study, a field experiment was developed to measure the data of aeolian transport and microclimate during different dust events with an auto sand sampler, a piezoelectric saltation sensor (H11-Sensit) and a 10 m high meteorological tower in Ta Zhong, the hinterland of the Taklimakan Desert from July to August in 2010. Then, the sampling efficiency of auto sand sampler and horizontal dust flux of near surface were analyzed based on observed data. The results were as follows: sand collector skip turnover increased with the increase of the intensity of dust weather frequency increases, the power function relationship y=2.115 x0.9841, R2 = 0.9206, flip frequency per minute increased from 0.2794 times to 1.3041 times, change is obvious; With the strength of the weather, time to flip the average sediment is shrinking. Sandstorm weather, skip to flip a volume of 3.7160 g, grade I flying sand weather flip a volume of 4.0275 g, the amount of class II flying sand weather turns over a 5. 0035g.The horizontal dust flux of different dust events that calculated with the equation Q=256M; the maximum of one dust event was about 190.335 kg, and the minimum was 1.2 kg. Overall, the sand transportation rate increased with wind speed. However, the changes of sand transportation rate did not quite fit in with wind speed during some dust events, and in this case the corresponding surface temperature was significantly higher. The experimental data obtained can provide theoretical basis for regional sand control and enacting effective engineering measures.

Subject Areas

Soil erosion; Winds; Sand collection efficiency; Dust horizontal flux

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