【摘要】 近景摄影能够在无干扰的条件下,精确地测定正在发育阶段的风成沙纹,以波动方式整体移动的平均移动速度VR(cm·min-1),和相应的沙纹波长L(cm)波高Δh(mm)及其平均值。同时,求得沙纹移动速度VR与局地风速VL之间的实验关系式为VR=1 58×(VL-5.5)0.67,沙纹移动是缓慢的,其数量级变化于10-1～101cm·min-1之间。沙纹波长与波高与直接测定值相当吻合。更多还原

【Abstract】 The study of sand ripple movement is very important in the research of aeolian sand geomorphology. Experimental results showed that the mean migration velocity of sand ripples \%VR\%(cm\5min-1), corresponding wave length \%L\% (cm) and wave height Δ\%h\% as well as their mean values of developing sand ripples can be precisely determined under undisturbed condition. From the study we have obtained the empirical formula concerning \%VR\% and local wind velocity \%VL, VR\%=1.58 (\%VL\%-5.5)0.67. The migration of sand ripples is slow, whose velocity ranging from 10-1～101 cm\5min-1. The calculated wave length and wave height of sand ripples are consistent with directly measured results in wind tunnel and field.更多还原