Spatial variation of surface erosion rate in a fault zone and its controlling factors
文献类型:期刊论文
作者 | Li, Xuemei4; Zhang, Huiping3; Chen, Xiaoqing2,4; Liu, Weiming2,4; Han, Mingming1; Zhao, Xudong3 |
刊名 | GEOMORPHOLOGY |
出版日期 | 2023-09-15 |
卷号 | 437页码:14 |
ISSN号 | 0169-555X |
关键词 | Be-10 erosion rate Bedrock fracture Sediment grain size Daqing Shan fault |
DOI | 10.1016/j.geomorph.2023.108802 |
英文摘要 | Topographic relief and bedrock fractures caused by fault activity can accelerate surface erosion, suggesting that erosion rates increase with decreasing distance to the fault core. To test this hypothesis, we used Be-10 cosmogenic nuclides to quantify catchment-wide erosion rates at various distances from a fault in the footwall of the Daqing Shan fault system, a 200-km-long active normal fault in Inner Mongolia, northern China. In addition, in order to examine the influence of topography and bedrock fractures on the surface erosion processes in the fault-weakened zone, their relationships with hillslope erosion, fluvial sediment grain size and transport efficiency, erosion rates, and erosion coefficients were studied. The resulting catchment-wide erosion rates ranged from 0.01 +/- 0.00-0.13 +/- 0.01 mm yr(-1). These erosion rates and coefficients were unaffected by distance from the fault. The analysis of topography, bedrock fractures, and hillslope erosion yielded distinct hillslope erosion processes at different distances from the fault. Rapid mass wasting events, such as landslides, occurred at <15 km from the fault in steep, rocky hillslopes with abundant bedrock fractures. In contrast, at >15 km from the fault, hillslopes gradually become more gentle and soil-mantled. These spatial-slope configuration differences result in a decrease in sediment grain size delivered to river channels with increasing distance from the fault. Once sediments enter river channels, they impact fluvial transport capacity by influencing the initial motion threshold of sediment. Correlation analyses revealed that sediment transport efficiency in channels directly controls the catchment-averaged erosion rate and coefficient. This mechanism explains why the erosion rate remains insensitive to variations in topography and bedrock fractures in fault-weakened zones. |
WOS关键词 | GRAIN-SIZE ; NUCLIDE PRODUCTION ; FRACTURE DENSITY ; TECTONIC UPLIFT ; RIVER INCISION ; SEDIMENT ; HILLSLOPE ; STEEP ; CONSTRAINTS ; DENUDATION |
资助项目 | Second Tibetan Plateau Scientific Expedition and Research (STEP)[2019QZKK0704] ; Na-tional Natural Science Foundation of China[41622204] ; Na-tional Natural Science Foundation of China[42101014] ; Na-tional Natural Science Foundation of China[2019QZKK0903] ; [41888101] |
WOS研究方向 | Physical Geography ; Geology |
语种 | 英语 |
出版者 | ELSEVIER |
WOS记录号 | WOS:001033722500001 |
资助机构 | Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Na-tional Natural Science Foundation of China |
源URL | [http://ir.imde.ac.cn/handle/131551/57565] |
专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
通讯作者 | Chen, Xiaoqing; Liu, Weiming |
作者单位 | 1.Chengdu Ctr China Geol Survey, Chengdu 611230, Peoples R China 2.China Pakistan Joint Res Ctr Earth Sci, CAS HEC, Islamabad 45320, Pakistan 3.China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing 100029, Peoples R China 4.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610299, Peoples R China |
推荐引用方式 GB/T 7714 | Li, Xuemei,Zhang, Huiping,Chen, Xiaoqing,et al. Spatial variation of surface erosion rate in a fault zone and its controlling factors[J]. GEOMORPHOLOGY,2023,437:14. |
APA | Li, Xuemei,Zhang, Huiping,Chen, Xiaoqing,Liu, Weiming,Han, Mingming,&Zhao, Xudong.(2023).Spatial variation of surface erosion rate in a fault zone and its controlling factors.GEOMORPHOLOGY,437,14. |
MLA | Li, Xuemei,et al."Spatial variation of surface erosion rate in a fault zone and its controlling factors".GEOMORPHOLOGY 437(2023):14. |
入库方式: OAI收割
来源:成都山地灾害与环境研究所
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