[1] Khalil I. Othman, Wang Deguan, Chen Jieren,. Numerical simulation of bed degradation in alluvial channels [J]. Journal of Southeast University (English Edition), 2003, 19 (4): 392-397. [doi:10.3969/j.issn.1003-7985.2003.04.019]

Copy

Numerical simulation of bed degradation in alluvial channels()

Share：

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

19

Issue:

2003 4

Page:

392-397

Research Field:

Traffic and Transportation Engineering

Publishing date:

2003-12-30

Info

Title:

Numerical simulation of bed degradation in alluvial channels

Author(s):

Khalil I. Othman¹;  Wang Deguan¹;  Chen Jieren²

¹College of Environment Science and Engineering, Hohai University, Nanjing 210098, China
²College of Water Resources and Environment, Hohai University, Nanjing 210098, China

Keywords:

degradation;  armoring;  numerical model

PACS:

U617

DOI:

10.3969/j.issn.1003-7985.2003.04.019

Abstract:

A numerical model to simulate the bed degradation process in a straight alluvial channel with respect to time and distance is introduced. The simulation takes into account the effect of non-uniformity of the bed material, and variations in the dimension of bed forms. The model predicts the changes in the grain size distribution with the time and space during degradation process. The numerical model proposes that the armoring process in degrading channels does not depend only on hydraulic characteristics of the flow but also on variation in the grain size distribution of sediments on the bed. The model was applied and compared with the results obtained from experiments conducted in 24 m recirculating flume for two sizes of sand; a good agreement was found between observed and calculated values.

References:

[1] Galay V J. Causes of river bed degradation [J]. Water Resources Research, 1983, 19(5): 1057-1090.
[2] Stanley J W. Retrogression on lower colorado river after 1935 [J]. Trans of ASCE, 1955, 116: 943-957.
[3] Hales Z L, Shindala A, Denson K H. Riverbed degradation prediction [J]. Water Resources Research, 1970, 6(2): 549-556.
[4] Tinney E R. The process of channel degradation [J]. J of Geophysical Research, 1962, 67(4): 1475-1480.
[5] Suryanarayana B, Shen H W. Laboratory study of degradation and aggradation [J]. J Waterways Harbor and Costal Engrg Div, ASCE, 1970, 93(WW4): 615-631.
[6] Koumura, Simons D B. Riverbed degradation below dams [J]. J of Hydraulic Div, ASCE, 1967, 93(HY4):1-14.
[7] Gessler J. The beginning of bed load movement of mixtures investigated as natural armoring in channels[R]. Pasadena, Calif: W M Keck Laboratory of Hydraulics and Water Resources California Institute of Technology, 1967.
[8] Ashida K, Michine M. An investigation of river bed degradation down stream a dam[A]. In: Int, Ass for Hydraulic Research [C]. 1971. C30.
[9] Little W C, Mayer P G. The role of sediment gradation on channel armoring ERC-0672 [R]. Atlanta, Ga: School of Civ Engrg and Envir Res Ctr, Georgia Int of Tech, 1972.
[10] Borah D K, Alonso C V, Prasad S M. Routing graded sediments in streams: formulation [J]. J of Hydraulic Div, ASCE, 1982, 108(12):1486-1503.
[11] Shen H W, Lu J Y. Development and prediction of bed armoring [J]. J of Hydraulic Engrg, ASCE, 1983, 109(4):611-629.
[12] Park I, Jain S C. Numerical simulation of degradation of alluvial channel beds [J]. J of Hydraulic Engrg, ASCE, 1987, 113(7): 845-859.
[13] Othman K I. Effect of bed material gradation on degradation downstream from a sluice gate [D]. Iraq: Irrigation and Drainage Engineering Department University of Mosul, 1992.
[14] Streeter V L, Wylie E B. Fluid mechanics[M]. New York: Mc Graw-Hill, 1983.
[15] Simons D B, Senturk F. Sediment transport technology [M]. Fort Collins, Colorado: Water Resources Publications, 1977.
[16] Yalin M S. River mechanics [M]. Exeter: BPCC Wheatons Ltd, 1992.
[17] Gessler J. River mechanics [M]. Colorado: H W Shen, Fort Collins, 1971.
[18] Karim M F, Kennedy J F. Computer-based predictors for sediment discharge and friction factor of alluvial streams [R]. Iowa City, Iowa: IIHR Report No.242, Univ of Iowa, 1981.
[19] Parker G, Sutherland A J. Fluvial armor[J]. J of Hydraulic Res, ASCE, 1990, 28(5):529-544.

Memo

Memo:

Biography: Khalil I. Othman(1965—), male, graduate, Iraq, khalil-othman@hotmail.com.

Common functions