Study on dynamic mechanism of dust emission from gobi based a portable wind tunnel experiment atop the Mogao Grottoes， Dunhuang， China

doi:10.7522/j.issn.1000-694X.2023.00016

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (2): 216-225.DOI: 10.7522/j.issn.1000-694X.2023.00016

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Study on dynamic mechanism of dust emission from gobi based a portable wind tunnel experiment atop the Mogao Grottoes， Dunhuang， China

Shuyi Chen¹^,²(), Weimin Zhang¹, Shaoxiu Ma¹, Lihai Tan¹, Linhao Liang¹^,²

^1.Dunhuang Gobi and Desert Ecology and Environment Research Station，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China

Received:2022-12-21 Revised:2023-01-27 Online:2023-03-20 Published:2023-04-12

Abstract

Abstract:

Impacting splash of saltating particles is the main dynamic mechanism of dust emission from gobi. However， due to the lack of high frequency measuring instruments and experimental methods， previous studies on gobi dust emission including wind tunnel experiments and field observation can not accurately and quantitatively study the impact of the energy of saltatingsand on the dust emission from gobi. In this study， the field wind tunnel experiments method was used to study the dynamic mechanism of the dust variation law in the near surface （0-20 cm） of the gobi and the dynamic mechanism of dust emission， and the different energy processes of saltating sand were measured by Sensit sensor. The results show that bombardment of saltating sands is one of the main factors of dust emission near surface of gobi and an important factor to assess the dust emission. Rebounding energy has the best correction with dust emission flux， followed by surface impact energy， and impact energy at 5cm above the ground has the weakest correction. It shows that the saltating sand bombardment and the conversion of impact energy and rebounding energy is an important dynamic process of dust emission.

Key words: dust emission, impact energy, rebounding energy, gobi, wind tunnel experiment, dust emission flux

CLC Number:

P931.3

Shuyi Chen, Weimin Zhang, Shaoxiu Ma, Lihai Tan, Linhao Liang. Study on dynamic mechanism of dust emission from gobi based a portable wind tunnel experiment atop the Mogao Grottoes， Dunhuang， China[J]. Journal of Desert Research, 2023, 43(2): 216-225.

Figures/Tables 9

Table 1 Grain size composition of gobi and sand dune atop the grottoes （%）

样品

极粗砂

1~2 mm

粗砂

0.5~1.0 mm

中砂

0.25~0.5 mm

细砂

0.125~0.250 mm

极细砂

0.063~0.125 mm

细粒

<0.063 mm

Fig.1 Movable wind tunnel

Fig.2 Wind tunnel experiment layout and instrument layout

Fig.3 The fitting relationship between impact energy， rebounding energy and their difference and friction wind speed under no sand supply condition （A） and sand supply condition （B）

Fig.4 The fitting relationship between the impact， rebounding energy and their difference and dust release flux under no sand supply condition （A） and sand supply condition （B）

Table 2 Comparison of gobi dust emission flux and impact， rebounding energy under no sand supply condition and sand supply condition

	无供沙条件					供沙条件
U_*/（m·s^-1）	0.69	0.84	0.96	1.12	1.28	0.77	0.88	1.01	1.24	1.37
F/(μg·m^-2·s^-1)	649.41	2 343.13	2 896.64	3 446.79	3 409.74	3 277.62	6 349.68	10 188.32	12 407.25	13 772.68
冲击能量/×10^-7 J	1.04	3.82	8.48	11.44	11.28	14.40	24.08	40.90	88.20	108.56
F/冲击能量	624.44	613.39	341.59	301.29	302.28	227.62	263.69	249.11	140.67	126.865
反弹能量/×10^-7 J	0.46	1.24	3.04	4.84	5.23	8.63	10.93	12.41	14.11	15.58
F/反弹能量	1 411.76	1 889.62	952.84	712.14	651.95	379.79	580.94	820.97	879.32	883.99

Fig.5 The relationship between gobi bombardment efficiency and the difference between impact energy and rebounding energy under no sand supply condition （A） and sand supply condition （B）

Fig.6 Time series of single particle impact energy and impact particle number under the conditions of no sand supply （A） and sand supply （B）

Fig.7 Validation of simulated and observed values of multiple regression equation

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Study on dynamic mechanism of dust emission from gobi based a portable wind tunnel experiment atop the Mogao Grottoes， Dunhuang， China

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