Stochastic properties of bed load transport

Jaeho Shim, Guohong Duan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The fluctuation of bed-shear stress on moving bed load particle plays an important role in the particle velocity. Our theoretical model treated the instantaneous bed-shear stress as a log-normal distribution, and developed a theoretical model to calculate the spatially averaged particle velocity and its distribution. A series of experiments were conducted in an open channel flume to measure instantaneous bed load particle velocities using the image based bed load analyzer. The instantaneous bed load particle velocities were measured in both the streamwise and the transverse directions. A total of 26 experimental runs were performed, and over 1,000 instantaneous particle velocities in the horizontal plane were measured. Results showed that the bed load particle velocity relates to the instantaneous bed-shear stress, which satisfies a log-normal distribution. The spatially averaged streamwise mean velocity is a function of mean bed shear stress and particle size. The probability density function (PDF) of the streamwise particle velocity is an exponential function, and the PDF of transverse particle velocity is a normal distribution. Bed-shear stress affects both the particle velocity distribution and the peak intensity. At last, the measurements were used to verify a theoretical model for the particle velocity and its distribution. Reasonable agreements were found between model's predictions and the experimental measurements.

Original languageEnglish (US)
Title of host publicationWorld Environmental and Water Resources Congress 2015: Floods, Droughts, and Ecosystems - Proceedings of the 2015 World Environmental and Water Resources Congress
PublisherAmerican Society of Civil Engineers (ASCE)
Pages1841-1850
Number of pages10
ISBN (Print)9780784479162
DOIs
StatePublished - 2015
EventWorld Environmental and Water Resources Congress 2015: Floods, Droughts, and Ecosystems - Austin, United States
Duration: May 17 2015May 21 2015

Other

OtherWorld Environmental and Water Resources Congress 2015: Floods, Droughts, and Ecosystems
CountryUnited States
CityAustin
Period5/17/155/21/15

ASJC Scopus subject areas

  • Water Science and Technology

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  • Cite this

    Shim, J., & Duan, G. (2015). Stochastic properties of bed load transport. In World Environmental and Water Resources Congress 2015: Floods, Droughts, and Ecosystems - Proceedings of the 2015 World Environmental and Water Resources Congress (pp. 1841-1850). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784479162.180