|Table of Contents|

[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]
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Numerical simulation of bed degradation in alluvial channels()
冲积河道河床冲刷过程的数值模拟
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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
冲积河道河床冲刷过程的数值模拟
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
Khalil I. Othman1;  汪德罐1;  陈界仁2
1河海大学环境科学与工程学院, 南京 210098; 2河海大学水资源环境学院, 南京 210098
Keywords:
degradation;  armoring;  numerical model
冲刷;  粗化;  数值模型
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.
本文建立了一维数值模型来模拟顺直冲积渠道的冲刷过程.模型考虑了床沙的非均匀性、床面形态变化, 应用该模型预测计算了冲刷过程中的床沙级配变化.模型计算结果表明床沙粗化过程不仅与水流的水力特性有关, 还与床沙的颗粒大小及分布有关.模型计算结果与2组非均匀床沙水槽试验结果进行了比较, 结果表明模型计算结果与试验结果符合得较好.

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.
Last Update: 2003-12-20