Study On Dune Morphological Characteristics Of Different Measures Based On Unmanned Aerial Vehicle Technology

Sand dunes are the main research objects of aeolian geomorphology.The basic characteristics of sand dunes are one of the important research contents.This study takes the mobile sand dunes on the northern edge of the Kubuqi Desert and the sand dunes with different sand barriers as the research object.The UAV remote sensing technology and RTK measurement technology are used to obtain the basic spatial information data of the dunes,and the UAV aerial survey data and RTK measurement are compared.Data,carry out the research on the accuracy of UAV's morphological measurement in sand dunes,and explore its feasibility and accuracy.On this basis,using the aerial data of drones to carry out the morphological characteristics change and dune movement law of sand dunes with different sand barrier measures.So as to achieve fast,accurate and convenient access to sand dune shape data and understand its changes,to provide support for wind and sand landform monitoring.The main results are as follows:(1)By comparing the UAV data with the RTK measurement data,it is found that the height of the dune measured by the two data is within 0?0.5m,the volume difference is 3000?7000m3,and the slope direction is basically the same,indicating that the UAV technology is suitable for sand dune morphology measurements in the study area(2)Based on the study of sand dune morphological characteristics measured by UAV technology,it is found that the sand dunes with sand barriers in the middle and lower reaches of the windward slope are effectively controlled,and the top of the dunes is blown and the volume is reduced.Dune B(laying of PLA grid-like sand barriers of 0.5m×0.5m,1m×lm and 2m×2m)reduced by 9.5%and height decreased by 15.4%;sand dune C(PLA sandbag sand barrier(1m×)lm),reed sand barrier(1m × 1m)and Shaliu sand barrier(1m × 1m and 2m × 2m))decreased by 3.6%and height decreased by 6.2%.(3)Based on the UAV technology,the study of the moving speed of sand dunes shows that the moving speed of sand dunes is negatively linearly related to the height:v=-0.3869H+4.861(5?H?11),the coefficient of determination R2=0.846,three sand dunes(A The movements of B,C and C for 2 years are 5.25m,3.75m and 2.54m respectively.The moving speed of sand dunes with sand barriers in the middle and lower reaches of the windward slope is reduced by 45%compared with the moving sand dunes.