Spatial-temporal characteristics of sediment transport by intermittent surges

被引:1
|
作者
Liu, Daochuan [1 ,2 ,3 ,5 ]
Jia, Yang [1 ]
He, Yunyong [1 ,4 ]
Shao, Jiang [1 ,5 ]
Xiang, Bo [1 ]
Liang, Miao [1 ,5 ]
Wang, Fuming [6 ,7 ]
Guo, Chengchao [6 ,7 ]
机构
[1] Sichuan Highway Planning Survey Design & Res Inst, Chengdu 610041, Peoples R China
[2] Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China
[3] Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
[4] Southwest Jiaotong Univ, Chengdu 610041, Peoples R China
[5] Sichuan Tongchuan Engn Technol Dev Co Ltd, Chengdu 610041, Peoples R China
[6] Sun Yat Sen Univ, Sch Civil Engn, Guangzhou 510275, Peoples R China
[7] Southwest Jiaotong Univ, Chengdu 610032, Peoples R China
关键词
Sediment transport; Intermittent surges; Size frequency distribution; Flow fluctuation; DEBRIS-FLOW; GRAIN COMPOSITION; RIVER; HAZARD; LANDSLIDES; WATERSHEDS; RANGES; CURVES;
D O I
10.1007/s10346-023-02025-7
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Debris flows move as surge waves and they transport volumes of sediment of various magnitudes at irregular time intervals. As exemplified by Jiangjia Gully (JJG; Yunnan Province, China), the sediment transport of such surges can fluctuate by up to four orders of magnitude within a single debris flow event. This study investigated the variation of the sediment transported by a series of surges based on observations of 3000 surges in JJG. It was found that the fluctuation in sediment transport evolved with surge progress and then finally decayed in a power law form with a decay coefficient of 0.1-0.5, which can be considered a representative of the under-lying dynamics. Moreover, the cumulative sediment yield followed a unified sediment size distribution (SSD) that can be expressed as P(S) = CS-beta exp(-S/S-c), with parameters well associated with the material composition of the surges. Moreover, this distribution also applies to transport processes in large-scale rivers, which suggests that the SSD could be used to predict the scale of sediment transport in rivers.
引用
收藏
页码:1225 / 1241
页数:17
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