高立式沙障处的风沙沉积及其表征的风沙运动规律

Blown Sand Deposits and Its Indications on Wind Activities around High Windbreaks

对高立式沙障处的风沙沉积情况与风沙活动强度之间的对应关系进行探讨。结果表明,在一定条件下,两者对应关系明显,相互间可进行换算。据此对应关系,在塔克拉玛干沙漠公路支线上选取合适路段,在不同地貌类型及不同地貌部位上,通过量测高立式沙障处的积沙量,得知风沙活动强度在不同区域的变化情况,从而进一步推断出塔克拉玛干沙漠腹地风沙运动的某些规律或特征:如最大输沙量可达17m3.m-1.a-1左右;在垄间低地中,一些小纵向沙垄可成为输送风沙的主要通道;在复合型纵向大沙垄中,沙垄体自身的运动形式与单个沙丘的运动形式相类似,等等。

This paper discussed the relations of sand deposits with wind activity, strength around the high windbreaks. Results show that under some limitations there are close correlations between the wind activity strength and sand deposits. According to this correlation, through measurements of sand deposits around the high windbreaks we estimated the variations of wind activity strength on different ground surfaces and different geomorphologic terrains along the branches of Taklimakan Desert Highway, accordingly inferred some laws or characteristics of wind activities in the central Taklimakan. For instances, the maximum sand transport in this region is about 17 m^3·m^-1·a^-1; some simple linear dunes within interdunes may be the major channels of sand transport; activities of compound / complex longitudinal dunes are similar with that of the single dunes in the central Taklimakan.