线形沙丘研究进展评述与展望

线形沙丘不仅是地球上沙漠地区分布最广的沙丘类型之一,在火星、土卫六和金星等外星球也存在或可能存在。因此,线形沙丘可能是具有大气层的类地行星上分布广泛的一种风沙地貌。线形沙丘分布广泛、形态多样,某一理论不能合理解释其所有特征及其形态动力学机理,使其成为争议最大的一类沙丘。近年来随着新技术和新方法在风沙地貌研究中的应用,线形沙丘研究取得了诸多重要进展。以不同的研究主题为线索,对线形沙丘界定及分类、分布、物质组成、内部沉积构造、侧向移动、形成年代和形成假说等7个方面的研究进展进行了总结与综述,并对线形沙丘未来的研究前景进行了展望,认为在未来研究中应注重野外观测与室内实验分析相结合、与外星球线形沙丘的类比研究和新技术的应用等。

Review and Prospect of Linear Dune Research

As the most widespread dune type, linear dunes distribute in the major deserts on Earth. Meanwhile, extraterrestrial planets exploration indicates that linear dunes occur on Mars and Titan, and probably exist on Venus. Thus linear dune maybe the most widespread aeolian landform on the terrestrial planets encircled by atmosphere. One certain theory cannot justify all the characteristics of linear dunes because of widespread distribution and multiple morphological diversities, which accounts for too much controversy in linear dune formation. With the application of new techniques and methods in aeolian geomorphology research, the investigation of linear dune witnesses much important progress. This paper follows the research themes at different stages, comprehensively and thoroughly comment the research progress on linear dunes' definition and classification, distribution, material composition, internal sedimentary structures, lateral migration, formation date and theories. At last, this paper proposes the prospects of linear dune research in the future, and believes that future studies should pay more attention on the combination of field observation and laboratory simulation and analysis, analogy research with the extraterrestrial linear dunes, and the application of new techniques.