Comparison of wind dynamic environment among desert, oasis and gobi

doi:10.7522/j.issn.1000-694X.2020.00034

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (4): 113-119.DOI: 10.7522/j.issn.1000-694X.2020.00034

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Comparison of wind dynamic environment among desert, oasis and gobi

Fei Hu¹^,²(), Kecun Zhang¹(), Zhishan An¹^,², Yanping Yu¹^,²

^1.Dunhuang Gobi and Desert Ecological and Environmental 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:2019-12-05 Revised:2020-03-20 Online:2020-08-20 Published:2020-09-01
Contact: Kecun Zhang

Abstract

Abstract:

Based on the synchronous gradient meteorological observation data at 20 m height of three typical landscapes desert, oasis and gobi in Dunhuang, this study compared the wind dynamic environment characteristic parameters, which provides theoretical basis and technical support for ecological management of Dunhuang oasis and comprehensive prevention and control of peripheral sandstorm. The results show that the annual drift potential of the three typical landscapes is significantly different. The gobi’s drift potential (DP), resultant drift potential (RDP) and resultant drift direction (RDD) are 754.2 VU, 582.99 VU, 220.88°, respectively. The DP of oasis is 21.95 VU, RDP is 7.67 VU, and RDD is 259.53°. The desert’s drift potential is between them, which is 92.49 VU. And the RDP of desert is 19.29 VU, RDD is 16.79°. The spring drift potential is largest in all three typical landscapes, which in gobi, oasis and desert are 268.2 VU, 10.97 VU, and 44.08 VU, respectively. The dominant wind direction in gobi is northeast, but it is variable in desert, mainly east, south and west, and in oasis is east and west. Considering the distribution of regional sand sources, it is known that prevention and control should be strengthened at the junction between the southern edge of the oasis and the northern side of the Singing Sand Mountain to prevent the advancing of the Singing Sand Mountain to the oasis.

Key words: Dunhuang oasis, sand-blowing wind, drift potential, wind velocity profile, friction velocity

CLC Number:

P931.3

Fei Hu, Kecun Zhang, Zhishan An, Yanping Yu. Comparison of wind dynamic environment among desert, oasis and gobi[J]. Journal of Desert Research, 2020, 40(4): 113-119.

Figures/Tables 10

Fig.1 Location of observation sites

Fig.2 Pictures of observation sites (A. desert， B. oasis， C. gobi)

Fig.3 Change of monthly average wind speed

Fig.4 Change of seasonal average wind speed

Fig.5 Land surface wind velocity profiles in different seasons

Table 1 Friction velocity and aero-dynamical roughness length of land surface in different periods

物理量	生长季			非生长季
物理量	沙漠	绿洲	戈壁	沙漠	绿洲	戈壁
Z₀/cm	0.09	37.20	0.01	0.28	14.98	0.04
U_*/( m·s^-1)	0.76	1.94	0.91	0.94	1.75	0.96

Fig.6 Monthly frequency of sand-blowing wind

Fig.7 Distribution of sand-blowing wind

Fig.8 The sand-blowing wind roses

Fig.9 The drift potential

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Comparison of wind dynamic environment among desert, oasis and gobi

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