Spatial scale effect on sediment dynamics in basin-wide floods within a typical agro-watershed: A case study in the hilly loess region of the Chinese Loess Plateau

doi:10.1016/j.scitotenv.2016.08.082

	Spatial scale effect on sediment dynamics in basin-wide floods within a typical agro-watershed: A case study in the hilly loess region of the Chinese Loess Plateau
	Zhang, Le-Tao 1,2; Li, Zhan-Bin 1,3; Wang, Shan-Shan 1,2
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2016-12-01
卷号	572 页码:476-486
关键词	Spatial independency Flow-sediment relationship Runoff regulation Sediment control
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2016.08.082
通讯作者	Li, Zhan-Bin(zbli@ms.iswc.ac.cn)
英文摘要	Scale issues, which have been extensively studied in the domain of soil erosion, are considerably significant in geomorphologic processes and hydrologic modelling. However, relatively scarce efforts have been made to quantify the spatial scale effect on event-based sediment dynamics in basin-wide floods. To address this issue, sediment-runoff yield data of 44 basin-wide flood events were collected from gauging stations at the Chabagou river basin, a typical agro-basin (unmanaged) in the hilly loess region of the Chinese Loess Plateau. Thus, the spatial scale effect on event-based sediment dynamics was investigated in the basin system across three different spatial scales from sublateral to basin outlet. Results showed that the event-based suspended sediment concentration, as well as the intra-and inter-scale flow-sediment relationships remained spatially constant. Hence, almost all the sediment-laden flows can reach at the detachment-limited maximum concentration across scales, specifically for hyperconcentrated flows. Consequently, limited influence was exerted by upstream sedimentladen flow on downstream sediment output, particularly for major sediment-producing events. However, flood peak discharge instead of total flood runoff amount can better interpret the dynamics of sediment yield across scales. As a composite parameter, the proposed stream energy factor combines flood runoff depth and flood peak discharge, thereby showing more advantages to describe the event-based inter-scale flow-sediment relationship than other flow-related variables. Overall, this study demonstrates the process-specific characteristics of soil erosion by water flows in the basin system. Therefore, event-based sediment control should be oriented by the process to cut off the connectivity of hyperconcentrated flows and redistribute the erosive energy of flowing water in terms of temporality and spatiality. Furthermore, evaluation of soil conservation benefits should be based on the process of runoff regulation to comprehensively assess the efficiency of anti-erosion strategies in sediment control at the basin scale. (C) 2016 Published by Elsevier B.V.
资助项目	National Natural Science Foundation of China[41330858]
WOS关键词	PREDICTING SOIL-EROSION ; HYPERCONCENTRATED FLOWS ; HYDRAULIC GEOMETRY ; YIELD ; RUNOFF ; AREAS ; MODELS ; FIELD ; CATCHMENT ; SYSTEMS
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000387807200048
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/311030/65730]
专题	中国科学院地理科学与资源研究所
通讯作者	Li, Zhan-Bin
作者单位	1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Xian Univ Technol, Minist Educ, Key Lab Northwest Water Resources & Environm Ecol, Xian 710048, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Le-Tao,Li, Zhan-Bin,Wang, Shan-Shan. Spatial scale effect on sediment dynamics in basin-wide floods within a typical agro-watershed: A case study in the hilly loess region of the Chinese Loess Plateau[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2016,572:476-486.
APA	Zhang, Le-Tao,Li, Zhan-Bin,&Wang, Shan-Shan.(2016).Spatial scale effect on sediment dynamics in basin-wide floods within a typical agro-watershed: A case study in the hilly loess region of the Chinese Loess Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,572,476-486.
MLA	Zhang, Le-Tao,et al."Spatial scale effect on sediment dynamics in basin-wide floods within a typical agro-watershed: A case study in the hilly loess region of the Chinese Loess Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 572(2016):476-486.