探地雷达在沙漠研究中的应用

Application of Ground Penetrating Radar in Desert Research

目前国内外开展的沙丘形成机理、发育过程的研究多依靠短期的风沙观测分析,或者对浅层内部构造的取样分析。对于这些研究手段,难以从三维空间角度对其内部整体构造加以研究,从而也难以对形成机理、发展变化过程有一个全面的认识。我们利用现代技术在国内率先应用探地雷达开展有关沙丘内部构造和下部古地形的研究工作。研究结果揭示了三垄沙南段的成因主要由风成作用形成,而与下伏地形无关,由其内部构造可见三垄沙的形成为典型的在地势平缓地区,单风向为主作用下形成的新月形沙丘。沙丘的整个内部结构可分为三个区域,反映了其不同部位的结构特征。同时该研究成果显示应用探地雷达开展有关沙漠内部结构研究是一条非常有效的新途径。

At present, the research about sand dune forming mechanism and its development process mainly depends on wind measurement or sample analysis taken in shallow layers. It is difficult to study these problems in three-dimension and consider them through the all-interior structure with these research means. In this research, by the advantage of the modern technique development, we have used the Ground Penetrating Radar(GPR) to do some work about sand dune interior structure and original terrain investigation. The investigating results show that formation of the south section of Sanlong sand dune mainly formed under the action of single direction wind, and has no relation with original terrain below it. Viewed from interior structure, Sanlong sand dune is a typical crescent sand dune. Its interior structure can be mainly divided into three sections, which reflecting their natural environment in their formation period. The research results also testify that GPR method is an effective means to study sand dune interior structure.