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Effect of stones on the sand saltation threshold during natural sand and dust storms in a stony desert in Tsogt-Ovoo in the Gobi Desert,Mongolia

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Journal of Arid Land 2021年第7期13卷 653-673页

作者： Batjargal BUYANTOGTOKH Yasunori KUROSAKI Atsushi TSUNEKAWA Mitsuru TSUBO Batdelger GANTSETSEG Amarsaikhan DAVAADORJ Masahide ISHIZUKA Tsuyoshi T SEKIYAMA Taichu Y TANAKA Takashi MAKI Arid Land Research Center Tottori UniversityTottori 680-0001Japan Information and Research Institute of Meteorology Hydrology and EnvironmentUlaanbaatar 15160Mongolia Faculty of Engineering and Design Kagawa UniversityTakamatsu 761-0396Japan Meteorological Research Institute Japan Meteorological AgencyTsukuba 305-0052Japan

Non-erodible elements such as stones and vegetation are key to controlling wind erosion and dust emission in *** deserts are widely distributed in the Gobi Desert,but the effect of stones on wind erosion and dust emission have not been well studied,except under artificial *** this study,we evaluated the effect of stones on wind erosion and dust emission by measuring the sand saltation threshold in a stony desert in Tsogt-Ovoo in the Gobi Desert,Mongolia,under natural surface conditions during sand and dust *** quantified the amount of stones by measuring the roughness density,and determined the threshold friction velocity for sand saltation by measuring wind speed and sand saltation *** results showed that the threshold friction velocity increased with the roughness density of *** the northern part of the study area,where neither a surface crust nor vegetation was observed,the roughness density of stones was 0.000 in a topographic depression(TD),0.050 on a northern slope(***),and 0.160 on the northern mountain(***).The mean threshold friction velocity values were 0.23,0.41,and 0.57 m/s at the TD,***,and *** sites,*** the southern part of the study area,the roughness density values of stones were 0.000 and 0.070-0.320 at the TD and southern slope sites,respectively,and the mean threshold friction velocities were 0.23 and 0.45-0.71 m/s,*** further compared the observed threshold friction velocities with simulated threshold friction velocities using Raupach's theoretical roughness correction and the measured roughness density values,and found that Raupach's roughness correction worked very well in the simulation of threshold friction velocity in the stony *** means that the results of our stone measurement can be applied to a numerical dust model.

关键词： arid region threshold friction velocity roughness density shear stress sand saltation threshold roughness correction Gobi Desert

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