乌玛高速沙漠段风沙环境特征及格状沙丘移动规律OA北大核心

[Objective]The movement of sand dunes is directly related to the characteristics of wind-sand environment and the morphology of sand dunes.The aims of this study are to explore the movement pattern of lattice sand dunes under the action of multiple factors,and to provide scientific basis for the prevention and control of wind-sand on highways in sandy areas.[Methods]Based on the local meteorological data and Google Earth satellite images,the wind-sand environment and the morphological evolution and movement pattern of lattice dunes at K167+300,K172+300 and K177+300 in the desert section of Whai-Maqin Highway from 2019 to 2021 were studied.[Results](1)The annual average sand-driving wind speed in the study area ranged from 6.07 to 6.84 m/s.Spring and summer were the main sand-transporting seasons,with the main wind direction being northwest and the secondary wind direction being southeast.The annual sand transport potential was between 31.77 VU and 38.89 VU,and the directional variability index(RDP/DP)was between 0.73 and 0.78,which belonged to low wind energy environment and medium variability wind condition.(2)From the northeast to the southwest of the study area,the main beam of the lattice sand dune shifted eastward,and the auxiliary beam shifted southward.The direction of the main and auxiliary beams was almost vertical,and the shape of the sand dune changed little as a whole.The length of the main and auxiliary beams,the distance between the main and auxiliary beams,and the height of the dune all showed an increasing trend,while the growth rate of the length of the main and auxiliary beams and the offset rate of the main and auxiliary beams showed a decreasing trend.(3)The direction of dune movement was between 140.43°and 152.64°,which was basically consistent with the annual RDD change,that is,moving southeastward.The average height of the dunes ranged from 5.24 m to 8.31 m,and the dune movement rate ranged from 2.31 m/a to 2.86 m/a,which showed a negative correlation.(4)There was a positive correlation between sand transport potential,annual average temperature and sand dune movement rate.In contrast,annual average temperature had a more significant effect on sand dune movement rate.The average annual precipitation and vegetation coverage were negatively correlated with the moving rate of sand dunes,and the influence of average annual precipitation on the moving rate was particularly important.[Conclusion]The movement of checkerboard dunes is closely related to local wind conditions,precipitation,temperature,vegetation coverage and dune morphology.The increase of sand transport potential and temperature will accelerate the forward movement of dunes,which is not conducive to the prevention and control of wind and sand.Increasing precipitation and vegetation coverage has a positive effect on the prevention and control of highway wind and sand disasters caused by dune movement.