TY - GEN

T1 - Stochastic properties of bed load transport

AU - Shim, Jaeho

AU - Duan, Guohong

N1 - Funding Information:
SK wishes to thank Indian National Science Academy for grant of its Honorary Scientistship to him. Facilities provided by NIPGR are also gratefully acknowledged.
Publisher Copyright:
© 2015 ASCE.

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84935121062&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84935121062&partnerID=8YFLogxK

U2 - 10.1061/9780784479162.180

DO - 10.1061/9780784479162.180

M3 - Conference contribution

AN - SCOPUS:84935121062

T3 - World Environmental and Water Resources Congress 2015: Floods, Droughts, and Ecosystems - Proceedings of the 2015 World Environmental and Water Resources Congress

SP - 1841

EP - 1850

BT - World Environmental and Water Resources Congress 2015

A2 - Webster, Veronica L.

A2 - Karvazy, Karen

PB - American Society of Civil Engineers (ASCE)

T2 - World Environmental and Water Resources Congress 2015: Floods, Droughts, and Ecosystems

Y2 - 17 May 2015 through 21 May 2015

ER -