沙漠倒置河床研究进展及其对火星类似物研究的启示北大核心CSCD

沙漠倒置河床是干旱区一种特殊的河流状正地貌,这种地形倒置现象蕴含着河床由负转正的重要环境变化信息。本文遵循地貌学思路,基于全球范围内对沙漠倒置河床的研究报道以及野外勘察工作,对该地貌的空间分布、形态特征、物质组成、沉积结构以及形成机制进行了详细梳理。总体而言,世界各大主要沙漠地区均发育该地貌类型,其表层多为岩石碎屑或胶结物硬层,下伏质地相对松软的砂、黏土物质,由于河床和河岸周边沉积物的差异化侵蚀,河床被相对抬高。基于此,对火星倒置河床的成因机制、物质组成和形成时间进行了讨论。尽管对地球上沙漠倒置河床的研究已经取得一定进展,但未来研究仍需对其形成年代及其代表的气候意义进行深入分析;同时还应更多地与不同类型的火星倒置河床进行类比研究,这将对揭示火星水文活动和环境变化等科学问题提供重要依据。

Study on the desert inverted channels and its implication for the study of the analogue on Mars

Desert inverted channel is a special river-liked positive landform in arid land， which contains information of significant environmental change that results in riverbed revising. Following the geomorphology law， this study investigated desert inverted channels around the world based on the published literature and our field observation. We summarized its spatial distribution， morphological characteristics， material composition， sedimentary structure and formation mechanism. Generally， inverted channels developed in the main sand seas around world. Its surface is composed of debris or cemented materials， subsurface consist of sandy-clay materials with a relatively soft texture. Due to the differential erosion of the sediments in the riverbed and riverbank， the riverbed is relatively elevated. Although some progress has been made in the study of deserts inverted channels on Earth， further research needs to be carried out in terms of their formation age and climatic significance. Meanwhile， more studies should be carried out to compare with the different types of inverted channels on Mars. This will provide important basis for revealing the hydrological activities and environmental changes on Mars.