Analysis of dynamic sedimentary environments in alluvial fans of some tributaries of the upper Yellow River of China based on ground penetrating radar (GPR) and sediment cores

doi:10.1016/j.quaint.2018.05.001

	Analysis of dynamic sedimentary environments in alluvial fans of some tributaries of the upper Yellow River of China based on ground penetrating radar (GPR) and sediment cores
	Gu, Zhenkui 1,2; Shi, Changxing 1; Yang, Hui 3; Yao, Haifang 4
刊名	QUATERNARY INTERNATIONAL
	2019-03-10
卷号	509 页码:30-40
关键词	Kongdui Alluvial fan Dynamic sedimentary environment GPR Sediment core
ISSN号	1040-6182
DOI	10.1016/j.quaint.2018.05.001
通讯作者	Shi, Changxing(shicx@igsnrr.ac.cn)
英文摘要	There are ten ephemeral tributaries of the Yellow River in the Inner Mongolia of China. As their catchments are covered by loose materials and are dominated by an intense interaction between wind and water erosion, these tributaries have had a high sediment yield and alluvial fans have been formed at the confluences of the tributaries with the Yellow River. However, there is a lack of understanding in the deposition model of the alluvial fans and the roles of fluvial and aeolian processes in sediment accumulation. In this paper, we used Ground Penetrating Radar (100 MHz) and sediment cores to investigate the sediments in channels and alluvial fans of four out of the ten tributaries. Radar reflection profiles of sedimentary strata are dominated by horizontal or sub-horizontal layers with a large scale, showing that the fluvial deposition on the alluvial fans has been dominated by a vertical accretion pattern. The reflection features like reflection free, inclined reflections, discontinuous, undulate, chaotic, sinuous reflections and channel fill exist to a lesser extent. A few GPR profiles send signs of intense erosion, and the one near the apex of an alluvial fan reveals that erosion had been active likely during the early Holocene and the channel position should be relatively fixed. The information extracted from this profile and the widely exposed late Pleistocene strata in the upper parts of the alluvial fans according to the geological map of the study area indicates that sediment accumulation has been slow in the upper alluvial fans since the early Holocene. The sediment cores indicate that sedimentary strata under the alluvial fans are mainly composed by sand and silt deposited in a fluvial environment and rarely reworked by wind actions. Also according to the core data, the sediment deposits in the west fans were coarser than those in the east fans, likely suggesting that the hydrodynamic force of the western tributaries was stronger than that of the east ones. The hydrodynamic environment of the tributaries was usually unstable historically and hyperconcentrated flows might occur with a higher frequency in one of the tributaries in history.
资助项目	National Natural Science Foundation of China[41671004] ; National Natural Science Foundation of China[41371036]
WOS关键词	GRAIN-SIZE DISTRIBUTION ; FLUVIAL ARCHITECTURE ; SEISMIC-REFLECTION ; BRITISH-COLUMBIA ; INNER-MONGOLIA ; DEPOSITS ; DESERT ; BASIN ; RESISTIVITY ; EVOLUTION
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000464677000004
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/48249]
专题	中国科学院地理科学与资源研究所
通讯作者	Shi, Changxing
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, 11A Datun Rd, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, 19 Yuquan Rd, Beijing 100049, Peoples R China 3.Hebei Univ Water Resources & Elect Engn, 1 Chongqing Rd, Cangzhou 061000, Peoples R China 4.Hebei Normal Univ, 20 East Rd Nanerhuan, Shijiazhuang 050024, Hebei, Peoples R China
推荐引用方式 GB/T 7714	Gu, Zhenkui,Shi, Changxing,Yang, Hui,et al. Analysis of dynamic sedimentary environments in alluvial fans of some tributaries of the upper Yellow River of China based on ground penetrating radar (GPR) and sediment cores[J]. QUATERNARY INTERNATIONAL,2019,509:30-40.
APA	Gu, Zhenkui,Shi, Changxing,Yang, Hui,&Yao, Haifang.(2019).Analysis of dynamic sedimentary environments in alluvial fans of some tributaries of the upper Yellow River of China based on ground penetrating radar (GPR) and sediment cores.QUATERNARY INTERNATIONAL,509,30-40.
MLA	Gu, Zhenkui,et al."Analysis of dynamic sedimentary environments in alluvial fans of some tributaries of the upper Yellow River of China based on ground penetrating radar (GPR) and sediment cores".QUATERNARY INTERNATIONAL 509(2019):30-40.