干旱区生态环境知识资源中心(Arid): Evaluating young fluvial terrace riser degradation using a nonlinear transport model: Application to the Kongur Normal Fault in the Pamir, northwest China

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DOI	10.1002/esp.5022
	Evaluating young fluvial terrace riser degradation using a nonlinear transport model: Application to the Kongur Normal Fault in the Pamir, northwest China
	Xu, Jianhong; Arrowsmith, J. Ramon; Chen, Jie; Schoenbohm, Lindsay M.; Li, Tao; Yuan, Zhaode; Owen, Lewis A.
通讯作者	Xu, JH
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
ISSN	0197-9337
EISSN	1096-9837
英文摘要	Selecting an appropriate hillslope transport model and calibrating model parameters are essential for morphological dating of fault and fluvial scarps. In this paper, we refine the method of profile-based morphologic dating by updating the representation of nonlinearity in sediment flux dependence on the hillslope gradient. We apply this revised method to fluvial scarps bounding fluvial terraces offset along the Kongur Normal Fault in the semi-arid high-altitude Pamir mountains, northwestern China. One of these terraces, the T3 surface, is dated to 7.0(+1.9)/(-1.6) kyr using Be-10 cosmogenic depth profile analysis. Well-preserved, dated terraces make this an ideal site to test the utility of morphological modelling in constraining ages of the young terrace risers. To do this, 35 topographic swath profiles across the terrace risers are extracted from a 0.2 m-resolution digital elevation model produced using structure from motion from photos collected by an unmanned aerial vehicle. The best estimates of morphological age are 13.9 +/- 1.3 m(2) for the riser T3/T4 and 11.9 +/- 1.3 m(2) for T2/T3 using a linear diffusion approach. These two morphological ages overlap within uncertainty and fail to distinguish between two young terrace risers. Alternatively, we employed a nonlinear diffusion model, calibrated with transport constant k = 1 m(2) kyr(-1), nonlinearity n = 2, and critical gradient S-c = tan(33 degrees). This nonlinear model produces ages of 7.3 +/- 0.5 kyr for T3/T4 and 4.0 +/- 0.2 kyr for T2/T3; these ages are consistent with terrace surface ages deduced by using vertical offset divided by independently determining average throw rate. This comparison shows the advantage of a nonlinear model in defining ages of young scarps. Furthermore, we explored the minor effect of heterogeneous degradation along steep sections of the scarp profiles. The nonlinear scarp modelling scheme we develop in this paper is suitable for studying scarp degradation in other regions. (c) 2020 John Wiley & Sons, Ltd.
英文关键词	nonlinear transport model fluvial terrace riser Kongur Normal Fault Pamir structure from motion (SfM)
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000589935100001
WOS关键词	SHAN EXTENSIONAL SYSTEM ; ALTYN-TAGH FAULT ; HILLSLOPE EVOLUTION ; SEDIMENT TRANSPORT ; SCARPS ; SLIP ; DIFFUSION ; RATES ; TOPOGRAPHY ; SHORELINE
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
来源机构	Arizona State University
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/328491
作者单位	[Xu, Jianhong; Chen, Jie; Li, Tao; Yuan, Zhaode] China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China; [Xu, Jianhong] China Earthquake Adm, Monitoring & Applicat Ctr 2, Xian, Peoples R China; [Arrowsmith, J. Ramon] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA; [Schoenbohm, Lindsay M.] Univ Toronto Mississauga, Dept Chem & Phys Sci, Mississauga, ON, Canada; [Owen, Lewis A.] North Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA
推荐引用方式 GB/T 7714	Xu, Jianhong,Arrowsmith, J. Ramon,Chen, Jie,et al. Evaluating young fluvial terrace riser degradation using a nonlinear transport model: Application to the Kongur Normal Fault in the Pamir, northwest China[J]. Arizona State University.
APA	Xu, Jianhong.,Arrowsmith, J. Ramon.,Chen, Jie.,Schoenbohm, Lindsay M..,Li, Tao.,...&Owen, Lewis A..
MLA	Xu, Jianhong,et al."Evaluating young fluvial terrace riser degradation using a nonlinear transport model: Application to the Kongur Normal Fault in the Pamir, northwest China".EARTH SURFACE PROCESSES AND LANDFORMS