干旱区生态环境知识资源中心(Arid): 塔克拉玛干沙漠河湖相沉积平原风蚀地貌发育的外营力作用机制

Arid

	塔克拉玛干沙漠河湖相沉积平原风蚀地貌发育的外营力作用机制
其他题名	Exogenic forces action mechanism in the development process of erosion landform on alluvial plains composed of fluvial-lacustrine deposits in the Taklimakan Desert
	李生宇1 ; 谷峰 2; 王海峰 1; 庞营军 1; 穆桂金1 ; 雷加强1 ; 刘小路 2; 张忠良 2; 闫健 2
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2012
卷号	35 期号:3 页码:358-364
中文摘要	河湖相沉积是一种非固结沉积物,是风蚀地貌发育的一种重要地质基础。在塔克拉玛干沙漠中发育在这种沉积物上的风蚀地貌分布非常普遍,但相关研究较少,尚缺乏风蚀地貌发育过程方面的研究。基于野外调查信息和理论分析,结合相关文献,分析了塔克拉玛干沙漠河湖相平原风蚀地貌发育的外营力作用机制。研究结果表明:(1)风蚀地貌发育的外营力作用主要有:风化作用、流水作用、风蚀作用以及重力作用;(2)风蚀作用是风蚀地貌发育的主要外营力,但是风化作用、流水作用和重力作用也发挥着重要的作用,它们的关键作用是形成风蚀突破口,而重力作用和风化作用是促进风蚀地貌后期快速发展的重要作用;(3)各种外营力协同作用和互为条件,它们在风蚀地貌发育的各阶段的重要性不同;(4)沉积层特殊沉积构造和外营力作用共同造成了风蚀地貌形态特征。
英文摘要	Fluvial-lacustrine deposit is a kind of consolidation sediments that is one important geological basis for erosion landform.The erosion landform developed on alluvial plains composed of fluvial-lacustrine deposits is widely distributed.But its relevant studies,especially about the development process of erosion landform are very less.Based on the field survey information,theoretical analysis and some relevant articles,this paper comprehensively analyzed the exogenic forces action mechanism in the development process of erosion landform on alluvial plains composed of fluvial-lacustrine deposits in the Taklimakan Desert.The results show as the following:(1) These main exogenic forces including weathering,running water,aeolian erosion and gravity drive the erosion landform development on alluvial plains composed of fluvial-lacustrine deposits in the Taklimakan Desert.(2) Because aeolian activities in the Taklimkan Desert occur very frequent,so aeolian erosion plays a leading role in erosion landform development.(3)At the same time,weathering,running water and gravity also play important roles.Some records of summer strong rainfall events in the Taklimakan Desert indicate that the function of running water in erosion landform development cant be neglected.Rain infiltration and soil cracks,main weathering forms,loosen the surface soil structure,smash sediments to pieces,and make soil be eroded easily.Moreover,all these exogenic forces have different importance in different stages of erosion landform development.But they work co-operatively and mutually reinforce.Wind erosion breakthroughs can develop under aeolian erosion together with weathering and running water in the initial stage.A series of erosion landforms,including deflation furrow,wind erosion groove,blowout pit,wind erosion depression,erosion platform,wind erosion residual pier,and wind erosion plain,can rapidly develop under aeolian erosion together with gravity and weathering in the rest of stages.Sand wedges,composed of sand particles deposited in the wedge-shaped space of soil cracks,are of great importance in erosion landform development.Rainwater flows into sand wedges and is adsorbed by sand.Due to good penetrability of sand deposits,water can infiltrate quickly without evaporation loss and reach the bottoms of cracks.The deep soil can be destroyed by soil expansion of wetting and unfreezing;soil cracks widen and extend into deep soil further.Lateral erosion and undercutting are the main forms of wind erosion as well as sheet erosion,they make the sediments hang up.Lateral erosion,undercutting and sand wedges provide good conditions for gravity collapse and accelerate the negative erosion landform development on the sediments with nonhomogeneous texture.Collapse diluvium also can slow down the speed of wind erosion landform development.(4) The morphological characteristics of erosion landform depend on the special exogenic forces combination and the interbedded sedimentary structure of alluvial plains,namely,compact sediment and soft sediments are distributed in turn in vertical profile.
中文关键词	风蚀地貌 ; 外营力 ; 河湖相沉积物 ; 塔克拉玛干沙漠
英文关键词	Erosion landform Exogenic forces Fluvial-lacustrine deposits Taklimakan Desert
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:4583780
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227995
作者单位	1.中国科学院新疆生态与地理研究所, 乌鲁木齐, 新疆 830011, 中国; 2.中国石油天然气股份有限公司塔里木油田分公司, 库尔勒, 新疆 841000, 中国
推荐引用方式 GB/T 7714	李生宇,谷峰,王海峰,等. 塔克拉玛干沙漠河湖相沉积平原风蚀地貌发育的外营力作用机制[J]. 中国科学院新疆生态与地理研究所,2012,35(3):358-364.
APA	李生宇.,谷峰.,王海峰.,庞营军.,穆桂金.,...&闫健.(2012).塔克拉玛干沙漠河湖相沉积平原风蚀地貌发育的外营力作用机制.干旱区地理,35(3),358-364.
MLA	李生宇,et al."塔克拉玛干沙漠河湖相沉积平原风蚀地貌发育的外营力作用机制".干旱区地理 35.3(2012):358-364.