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Equal-mobility bed load transport in a small, step-pool channel in the Ouachita Mountains

Authors :
Marion, Daniel A.
Weirich, Frank
Source :
Geomorphology. Sep2003, Vol. 55 Issue 1-4, p139. 16p.
Publication Year :
2003

Abstract

Equal-mobility transport (EMT) of bed load is more evident than size-selective transport during near-bankfull flow events in a small, step-pool channel in the Ouachita Mountains of central Arkansas. Bed load transport modes were studied by simulating five separate runoff events with peak discharges between 0.25 and 1.34 m3/s (1.0- to 1.6-year recurrence intervals) in a natural channel using controlled releases from a storage tank. EMT occurrence was investigated using four different bed load relationships suggested by previous research. With each of these approaches, the relationship of a given bed load characteristic (Dmax, distribution percentile, displacement distance and skewness) to some independent factor (τc*, τ and grain size) was assessed to determine which transport mode was evident. Regression models derived using combinations of these four relationships with different datasets provide seven separate tests. Five of the seven tests indicate that EMT occurred or was predominant. Several reasons may explain the apparent contradictory results, but the confounding effects of changes in the structural arrangements of bed material prior to or during the events seem particularly important. [Copyright &y& Elsevier]

Subjects

Subjects :
*SEDIMENT transport
*BED load

Details

Language :
English
ISSN :
0169555X
Volume :
55
Issue :
1-4
Database :
Academic Search Index
Journal :
Geomorphology
Publication Type :
Academic Journal
Accession number :
10863480
Full Text :
https://doi.org/10.1016/S0169-555X(03)00137-5