DOI: 10.5194/hess-18-1043-2014
Scopus记录号: 2-s2.0-84898437066
论文题名: Re-suspension of bed sediment in a small stream – Results from two flushing experiments
作者: Eder A ; , Exner-Kittridge M ; , Strauss P ; , Blöschl G
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 3 起始页码: 1043
结束页码: 1052
语种: 英语
Scopus关键词: Catchments
; Floods
; Deposited sediments
; High temporal resolution
; Middle section
; Sediment loads
; Sediment sources
; Small watersheds
; Streams draining
; Total sediment loads
; Suspended sediments
; flood deposit
; flood wave
; flow velocity
; flushing
; fluvial deposit
; sediment transport
; suspended sediment
; Austria
; Lower Austria
; Petzenkirchen
英文摘要: Streams draining small watersheds often exhibit multiple peaking sedigraphs associated with single peaking hydrographs. The process reasons of the multiple sediment peaks are not fully understood but they may be related to the activation of different sediment sources such as the stream bed itself, where deposited sediments from previous events may be available for resuspension. To understand resuspension of stream bed sediments at the reach scale we artificially flooded the small stream of the HOAL Petzenkirchen catchment in Austria by pumping sediment-free water into the stream. Two short floods were produced and flow, sediment and bromide concentrations were measured at three sites with high temporal resolution. Hydrologically, the two flood events were almost identical. The peak flows decreased from 57 to 7.9 L s-1 and the flow volumes decreased from 17 to 11.3 m2 along the 590 m reach of the stream. However, a considerably smaller sediment load was resuspended and transported during the second flood due to depletion of stream bed sediments. The exception was the middle section of the stream, where more sediment was transported during the second flood event which can be explained by differences between flow velocity and wave celerity and the resulting displacement of sediments within the stream. The results indicate that the first peak of the sedigraphs of natural events in this stream is indeed caused by the resuspension of stream bed sediments, accounting for up to six percent of the total sediment load depending on total flow volume. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78297
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Water Resource Systems, Vienna University of Technology, Karlsplatz 13, 1040 Vienna, Austria; Federal Agency for Water Management, Institute for Land and Water Management Research, Pollnbergstraße 1, 3252 Petzenkirchen, Austria; Institute of Hydraulic Engineering and Water Resources Management, Vienna University of Technology, Karlsplatz 13/222, 1040 Vienna, Austria
Recommended Citation:
Eder A,, Exner-Kittridge M,, Strauss P,et al. Re-suspension of bed sediment in a small stream – Results from two flushing experiments[J]. Hydrology and Earth System Sciences,2014-01-01,18(3)