流动沙漠地形起伏区尼龙网方格沙障破损程度的空间分异

Spatial differentiation of breakage degree of nylon net checkerboard barrier in sites with rugged terrain in Taklimakan Desert

在塔克拉玛干沙漠油田公路K287 km处,对设置在纵向复合沙垄区次级新月形沙丘上不同地貌部位的尼龙网方格沙障破损状况进行了调查研究,并对破损程度进行了综合评价。研究结果表明,(1)平沙地上的尼龙网方格沙障破损类型相对单一,以半埋型式为主;流动沙丘上的尼龙网方格沙障破损类型多样,而且不同地貌部位的破损类型不同。(2)沙丘个体及不同地貌部位的破损程度值远远高于平沙地,破损程度值排序为迎风坡脚>迎风坡中部>沙丘两翼>落沙坡>迎风坡中上部>丘顶。(3)沙丘不同地貌部位尼龙网方格沙障受损的空间分异主要与沙丘对近地表风流场的强烈扰动有关。(4)尼龙网方格沙障更适宜布设在平坦的地形,提高尼龙网方格沙障对地形起伏适应性的关键在于其布设模式以及布设配件的改进。

The breakage state of nylon net checkerboard barrier in different geomorphic sites of secondary barchane of longitudinal complex sand ridge was investigated at K287 km of the Taklimakan Desert Petroleum Highway and the breakage degree was evaluated. The research results show that:(1) the breakage types of nylon net checkerboard barrier on the flat land are relatively single and dominated by semi-buried. The breakage types on the moving dune were diverse and varied greatly among different geomorphic sites.(2) Breakage degree of individual sand dune and different geomorphig sites were greater than that on the flat sandy land. The sequence of breakage degree is toe > windward slopes > wings > leeward slopes > upper-middle on windward slopes > top of dunes.(3)The spatial differentiation of breakage degree of nylon net checkerboard barrier in different geomorphic sites of dunes is mainly caused by strong disturbance of the near ground surface wind field.(4) Sand-stabilizing project with nylon net checkerboard barrier is more suitable for flat sandy land. To enhance suitability of the nylon net checkerboard barrier for fluctuant terrain areas,improving the setting mode and accessories of the nylon net checkerboard barrier would be essential.