DOI: 10.1016/j.gloplacha.2017.03.003
论文题名: Using check dam deposits to investigate recent changes in sediment yield in the Loess Plateau, China
作者: Zhao T.-Y. ; Yang M.-Y. ; Walling D.E. ; Zhang F.-B. ; Zhang J.-Q.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2017
卷: 152 起始页码: 88
结束页码: 98
语种: 英语
英文关键词: Check dams
; Flood couplets
; Land use change
; Loess region
; Reconstructing sediment yields
; Soil and water conservation
Scopus关键词: Catchments
; Dams
; Deposits
; Floods
; Land use
; Landforms
; Reservoirs (water)
; Soil conservation
; Soils
; Storms
; Water conservation
; Watersheds
; Check dam
; Land-use change
; Loess region
; Sediment yields
; Soil and water conservation
; Sediments
英文摘要: Check dams are one of the most important engineering measures for controlling soil and water loss from watersheds and can play a key role in reducing sediment loads in rivers. In addition, the associated sediment deposits can in some circumstances provide a valuable source of information on changing rates of sediment production from the upstream watershed through time. A sediment profile with a depth of 11.325 m was examined within the deposits associated with a check dam at the outlet of the Nianyangou catchment, in the northern Loess Plateau, China, with a drainage area of 0.181 km2. The profile contained evidence of a total of 75 clearly identifiable flood event couplets, which corresponded to storm events occurring during the period 1960–1990. The variability of the grain size composition (clay content) of the sediment and its 137Cs activity and organic matter (SOM) content down the profile was used to identify individual flood event couplets and the record of event rainfall (particularly extreme storm events) was used to establish a chronology for the individual flood event couplets. Based on the reservoir capacity curve and information on couplet thickness and sediment bulk density, the sediment yield associated with each flood couplet has been calculated. Using these data, annual sediment yields were estimated to range between zero in 1965 to 9750 t in 1984. The period from 1960 to 1990 was divided into three distinct phases based on evidence for changing rates of sediment production within the watershed above the check dam provided by a double mass plot of cumulative sediment yield versus cumulative precipitation. These phases represent the periods: 1960 to 1964, 1965 to 1983 and 1984 to 1990, which were characterized by mean annual specific sediment yields of 26,220 t km− 2 year− 1, 5590 t km− 2 year− 1 and 19,130 t km− 2 year− 1, respectively. This study is seen as demonstrating the potential for using the sediment deposits associated with check dams to obtain retrospective assessments of changes in sediment yield in repose to land use change and the implementation of soil conservation and sediment control measures. © 2017 URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85015803702&doi=10.1016%2fj.gloplacha.2017.03.003&partnerID=40&md5=3c3ecd32c87d659ed666368568246742
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11746
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, China
Recommended Citation:
Zhao T.-Y.,Yang M.-Y.,Walling D.E.,et al. Using check dam deposits to investigate recent changes in sediment yield in the Loess Plateau, China[J]. Global and Planetary Change,2017-01-01,152.