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    Deterministic Uncertainty in Bed Load Transport

    Source: Journal of Hydraulic Engineering:;1999:;Volume ( 125 ):;issue: 003
    Author:
    Basil Gomez
    ,
    Jonathan D. Phillips
    DOI: 10.1061/(ASCE)0733-9429(1999)125:3(305)
    Publisher: American Society of Civil Engineers
    Abstract: A methodology for detecting nonlinear dynamics in bed load transport rate time series and testing the ability of distribution functions to characterize rate variations is outlined. The Kolmogorov entropy of a time series consisting of >10,000 bed load transport measurements made in a laboratory flume indicates that >80% of the variability can be explained by the sequential passage of bed forms as modeled by Hamamori's logarithmic cumulative distribution function, and the remainder may be attributable to deterministic uncertainty (chaos). Greater understanding of the mutual adjustments between the turbulent flow, sediment transport, and bed forms might reduce the level of uncertainty. Nevertheless, the Hamamori function affords an effective characterization of the distribution of at-a-point bed load transport rates in cases where the fine temporal details of the transport process can be ignored.
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      Deterministic Uncertainty in Bed Load Transport

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    contributor authorBasil Gomez
    contributor authorJonathan D. Phillips
    date accessioned2017-05-08T20:43:26Z
    date available2017-05-08T20:43:26Z
    date copyrightMarch 1999
    date issued1999
    identifier other%28asce%290733-9429%281999%29125%3A3%28305%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/24801
    description abstractA methodology for detecting nonlinear dynamics in bed load transport rate time series and testing the ability of distribution functions to characterize rate variations is outlined. The Kolmogorov entropy of a time series consisting of >10,000 bed load transport measurements made in a laboratory flume indicates that >80% of the variability can be explained by the sequential passage of bed forms as modeled by Hamamori's logarithmic cumulative distribution function, and the remainder may be attributable to deterministic uncertainty (chaos). Greater understanding of the mutual adjustments between the turbulent flow, sediment transport, and bed forms might reduce the level of uncertainty. Nevertheless, the Hamamori function affords an effective characterization of the distribution of at-a-point bed load transport rates in cases where the fine temporal details of the transport process can be ignored.
    publisherAmerican Society of Civil Engineers
    titleDeterministic Uncertainty in Bed Load Transport
    typeJournal Paper
    journal volume125
    journal issue3
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/(ASCE)0733-9429(1999)125:3(305)
    treeJournal of Hydraulic Engineering:;1999:;Volume ( 125 ):;issue: 003
    contenttypeFulltext
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