塔克拉玛干沙漠简单横向沙丘形态学示量特征

Morphologic parameters of the simple transverse dunes in Taklimakan Desert

通过对塔克拉玛干沙漠不同区域发育的简单横向沙丘的形态学示量特征分析 ,表明简单横向沙丘的形态特征与沙源的供应有十分密切的关系 ,沙源的不同丰度导致简单横向沙丘的形态学参数之间有明显的不同 .简单横向沙丘在发育过程中并不存在稳定的平衡状态 ,可能随沙源供应的改变其形态有所改变 ,而次生的横向沙丘由于主体沙丘对其有足够的沙源供应 ,因而形态可以得到充分发展 .沙丘形态参数的统计数据表明 ,在简单形新月形沙丘 -简单形横向沙丘 -沙丘复合体的发展模式中 ,随沙源供应的增加 ,沙丘发育时间系列的延长以及其他因素如 :风环境、植被等因素的作用 ,沙丘形态参数之间很难有确切的关系表达式 .

Morphologic parameters of the simple transverse dunes in Taklimakan Desert show that the morphologic parameters are closely related with the sand supplies. There are variations for the relations between the parameters because of the difference of the terrain of the dune development. Because the dunes may justify their morphology according to the state of the sand supplies, there are no stationary states for the simple transverse dunes in the process of the development. With ample sand supplies the body dunes provided, the morphology of the superimposed transverse dunes has been developed completely. The statistical data for the morphologic parameters show that on the mode of the simple crescent, dunes were first developed to simple transverse dunes, and then to compound/complex dunes, with the increase of the sand supplies, the time scale for the dune development, and other factors such as wind regimes, vegetation. It is difficult to express the relations of the morphologic parameters of the complex dunes.