Study on Discrimination Method for Dominant Wind Direction and Sand Dune Movement for Railway Alignment Design in Wind-Sand Areas
Blown sand hazard is the important factor affecting railway alignment design in wind-sand areas.In order to solve the technical difficulties in obtaining data of dominant wind direction and sand dune movement,the identification method was constructed for dominant wind direction in different types of dune areas,such as barchan dunes,linear dunes and pyramid dunes,by analyzing the internal relationship between the spatial shape of sand dunes and wind re-gime features.Further,combined with morphological parameters of sand dunes,the calculation model of moving speed was proposed through using Google Earth historical images and GIS software.The proposed method in this paper was veri-fied through studying the areas along the Hotan—Ruoqiang railway.The results show that the method of identifying the dominant wind direction along the railway based on sand dune morphology analysis can quickly identify the dominant wind direction within the railway selection areas,with the error between the calculation result and the meteorological mo-nitoring data within 15°.The moving velocity of sand dunes can be measured by using satellite images and GIS.Dune movement data can effectively supplement the wind-sand data observed by meteorological stations,and improves the effi-ciency and accuracy in sand disaster investigation in railway design.The research results can provide some technical sup-port for the disaster reduction design of railway in wind blown sand areas.
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