Numerical Study of the Formation of Typical Configuration of the Sand Dunes
In this paper, three typical sand dunes-transverse dunes, linear dunes and star dunes with three arms are simulated numerically in order to make clear the mechanism of the formation of them. The numerical method employed in this study can be divided into three parts: (1) Calculation of the air flow above the sand dunes; (2) Estimation of the sand transfer caused by the flow through the friction; (3) Determination of the shape of the sand ground. Since the computational area has been changed due to the last step, these procedures are repeated until typical shapes of the sand dunes are formed. In the first case, when the wind blows from one direction, the sand dune becomes essentially parallel straight ridges at right angle to the wind direction with only one slip-face on the lee side, which is known as transverse dunes; In the second case, when the winds blow from two directions,becomes essentially parallel straight ridge at the converging direction with two slip-faces on both sides, which is known as linear dunes; In the third case, when the winds blow from three directions, the sand dune extends at three directions and becomes the shape of a star with three arms.
R.ZHANG T.KAWAMURA
Key Lab of Geophysical Prospecting Under CNPC, China University of Petroleum, Beijing, China, 102249 Ochnomizu University, Tokyo, Japan, 112-8610
国际会议
西安
英文
370-377
2006-08-19（万方平台首次上网日期，不代表论文的发表时间）