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

Daniel A Marion; Frank Weirich

doi:10.1016/S0169-555X(03)00137-5

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

Journal article

Peer reviewed

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

Daniel A Marion and Frank Weirich

Geomorphology (Amsterdam, Netherlands), Vol.55(1), pp.139-154

2003

DOI: 10.1016/S0169-555X(03)00137-5

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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 m 3/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 ( D max, distribution percentile, displacement distance and skewness) to some independent factor ( τ c*, 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.

Bankfull streamflow

Bed load transport

Bed material size

Equal mobility

Size-selective

Step-pool channel

Details

Title: Subtitle: Equal-mobility bed load transport in a small, step-pool channel in the Ouachita Mountains
Creators: Daniel A Marion - US Forest Service
Frank Weirich - University of Iowa
Resource Type: Journal article
Publication Details: Geomorphology (Amsterdam, Netherlands), Vol.55(1), pp.139-154
Publisher: Elsevier B.V
DOI: 10.1016/S0169-555X(03)00137-5
ISSN: 0169-555X
eISSN: 1872-695X
Language: English
Date published: 2003
Academic Unit: Civil and Environmental Engineering; Earth and Environmental Sciences
Record Identifier: 9984229172202771

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