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    Author(s): Daniel A. Marion; Frank Weirich
    Date: 2003
    Source: Geomorphology 55 (2003) 139–154
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.2 MB)

    Description

    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 (tc*, t 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.

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    Citation

    Marion, Daniel A.; Weirich, Frank. 2003. Equal-mobility bed load transport in a small, step-pool channel in the Ouachita Mountains. Geomorphology 55 (2003) 139–154

    Keywords

    Bed load transport, Equal mobility, Size-selective, Step-pool channel, Bed material size, Bankfull streamflow

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