Abstract:

In this we studied relationships between the total sand transport rate and wind speed, between the transport rates at different heights and wind speed, and between sand transport rate under different wind speeds with the height in the sand flow structure of artificially managed sand dune and mobile dune on the East shore of Qinghai Lake based on field measurement and SPSS data analysis. We also compared sand flow structures of the artificially governed dunes and mobile dunes at the same wind speed and the similar sand transport rate. The results showed that artificial measures had effects on sand flow structure. Total sand transport rate went up as wind velocity increased on artificially managed sand dune. When wind velocity was greater than 11 m·s^-1, total sand transport rate increased obviously. The variation of sand transport rate at 0~2 cm height was not obviously related to wind velocity. However, at 2~60 cm height, sand transport rate increased with wind velocity, but simple curve simulation did not fit the change pattern. The transport rate of the both sand dunes decreased exponentially with height. at the same wind velocity, the transport rate in artificially governed sand dune was lower than that in mobile dune. When sand transport rate was similar, the wind on mobile dune was stronger than that on artificially governed sand dune, and there was obvious difference in the sand flow structures between the two dunes.

Key words: wind-sand flow structure, wind velocity, sand transport rate, Qinghai Lake drainage area