Equilibrium bed-concentration of nonuniform sediment

被引：20

作者：

Zhi-lin Sun

Zhi-feng Sun

John Donahue

机构：

[1] Dept. of Hydraulic and Ocean Eng., Zhejiang Univ.

[2] Coll. of Elec. Eng., Zhejiang Univ.

[3] Dept. of Geogr., Univ. of Montana

来源：

Journal of Zhejiang University-SCIENCE A | 2003年 / 4卷 / 2期

基金：

中国国家自然科学基金;

关键词：

Equilibrium bed concentration; Nonuniform sediment; Stochastic-mechanistic model; Suspended load;

D O I：

10.1631/jzus.2003.0186

中图分类号：

学科分类号：

摘要：

Knowledge of the equilibrium bed-concentration is vital to mathematical modeling of the river-bed deformation associated with suspended load but previous investigations only dealt with the reference concentration of uniform sediment because of difficulties in observation of the bed-concentration. This work is a first attempt to develop a theoretical formula for the equilibrium bed-concentration of any fraction of nonuniform sediment defined at the bed-surface. The formula is based on a stochastic-mechanistic model for the exchange of nonuniform sediment near the bed, and described as a function of incipient motion probability, non-ceasing probability, pick-up probability, and the ratio of the average single-step continuous motion time to static time. Comparison of bed-concentration calculated from the proposed formula with the measured data showed satisfactory agreement, indicating the present formula can be used for solving the differential equation governing the motion of suspended load.

引用

页码：186 / 194

页数：8

共 17 条

[1]

Akiyama J., Fukushima Y., Entrainment of noncohesive bed sediment into suspension, 3rd Intern. Symp. on River Sedimentation, (1986)

[2]

Cao Z., Turbulent bursting sediment entrainment function, ASCE Journal of Hydraulic Engineering, 123, 3, pp. 233-236, (1997)

[3]

Einstein H.A., The Bedload Function for sediment transport in open channel flows, U. S. Dept. Agri. Tech. Bull., 1026, (1950)

[4]

Einstein H.A., Chien N., Second Approximation to the Solution of the Suspended Load Theory, (1954)

[5]

Engelund F., Fredsoe, A sediment transport model for straight alluvial channel, Nordic Hydrology, 7, 5, pp. 293-306, (1976)

[6]

Garcia M., Parker G., Entrainment of bed sediment into suspension, ASCE Journal of Hydraulic Engineering, 117, 4, pp. 414-435, (1991)

[7]

Deng J., Theory of Gray System, (1990)

[8]

Mahmood K., Haque M.I., Suspended sediment in sandbed channels, Mechanics of Alluvial Channel, (1987)

[9]

Murphy P.J., Equilibrium boundary condition for suspension, ASCE Journal of Hydraulic Engineering, 111, 1, pp. 108-117, (1985)

[10]

Nadaoka K., A simple quasi-3D model of suspended sediment transport in a non-equilibrium state, Journal of Coastal Engineering, 18, 1, pp. 83-110, (1991)

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