Browse > Article
http://dx.doi.org/10.3741/JKWRA.2004.37.5.387

A Numerical Model for Bed Elevation Change and Bed Material Sorting in the Channel of Non-uniform Sediment  

Jang, Chang-Lae (한국수자원공사 수자원연구원 수자원시스템 연구소)
Jung, Kwan-Su (충남대학교 토목공학)
Kim, Jae-Han (충남대학교 토목공학과)
Publication Information
Journal of Korea Water Resources Association / v.37, no.5, 2004 , pp. 387-395 More about this Journal
Abstract
A computer model was proposed to simulate channel changes and bed material sorting of the meandering channels with different grain size in time and space simultaneously. The bed at the outside of the meandering channel with mixed sediments was scoured deeply and composed of coarser materials, and at the inside was aggradated and composed of finer materials. The sorting process started at the upstream inflection point and was finished at the downstream inflection point. At the natural with complicated boundaries and non-uniform grain sizes, the bed near the outside at the bend and narrow width was scoured deeper with coarse materials than in the channel with uniform grain sizes. The point bars showed lip at the inside near the bend and the bed materials were finer The bed at the outside near the bend and in the narrow width was scoured deeply with the coarser materials.
Keywords
Generalized coordinate system; meandering channels; uniform grain size; non-uniform grain size; sediment sorting;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Groin arrangements made of natural willows for reducting bed deformation in a curved channel /
[ Kawaguchi,H. ] / Advance in River Engineering
2 Armanini, A. (1996). 'Non-uniform sediment transport:dynamics of the active layer'. J. Hydraul. Res., IAHR, Vol. 33, No. 35, pp. 611-622
3 Ashida, K., Egashira, S., Liu, B., and Umemoto, M. (1990). 'Sorting and bed topography in meandering channels.' Annuals, Disas. Prev. Inst. Kyoto Univ., No. 33B-2, pp. 261-279
4 Iwagaki, Y. (1956). 'Hydrodynamical study on critical tractive force'. Proc. JSCE, No 41, pp. 1-21
5 Ashida, K., and Michiue, M. (1972) 'Study on hydraulic resistance and bedload transport rate in alluvial streams'. Trans, JSCE, 206, pp. 59-69
6 Armanini, A. and Di Silvio, G. (1988). 'A one-dimensional model for the transport of a sediment mixture in non-equilibrium conditions'. J. Hydraul. Res., IAHR, Vol. 26, No. 3, pp. 275-292   DOI
7 Ashida, K., Egashira, S. and Liu, B. (1991). 'Numerical method on sediment sorting and bed variation on meander channels.' Ann. J. Hyd. Eng., JSCE, Vol. 35, pp. 383-390   DOI
8 Einstein, H. A. (1950). 'The bed load function of sediment transportation in open channel flows'. Technical Bulletin 1026, USDA, Soil conservation service
9 Blom, A. (2003). 'Accounting for vertical sorting in river morphodynamics'. 3rd IAHR Symposium on River, Coastal and Estuarine Morphodynamics, Barcelona, Spain, Sept., 1-5, pp. 223-235
10 Deigaard, R. and Fredsoe, J. (1978). 'Longitudinal grain sorting by current in alluvial stream'. Nordic Hydrology, 9. pp. 7-16
11 Egiazaroff, I.V. (1965). 'Calculation of nonuniform sediment concentrations'. J. Hyd. Div., ASCE, Vol 91, No. Hy4, pp. 225-247
12 Parker, G. (1991). 'Selective sorting and abrasion of river gravel. I :Theory'. J. Hyd. Eng., ASCE, No 117. Hy2, pp. 131-149   DOI
13 Engelund, F. (1974). 'Flow and bed topography in channel beds'. J. Hyd. Div., ASCE, No 100. Hy11, pp.1631-1648
14 Hirano, M. (1971). 'River bed degradation with armoring'. Proc. JSCE, No 195, pp.55-65
15 Johannesson, J., and Parker, G.(1989). Linear theory of river meanders. in River Meandering, Water Resour., Monogr. Ser., vol. 12, edited by S.Ikeda and G. Parker, pp. 181-213, AGU, Washington, D.C.   DOI
16 Kikkawa, H., Ikeda, S., and Kitagawa, A. (1976). 'Flow and bed topography in curved open channels'. J. Hyd. Div., ASCE, No 102, Hy9, pp.1327-1342
17 Langbein, L. B., and Leopold, M. G. (1966). 'River meanders and the theory of minimum variance'. U.S. Geol. Surv. Prof. Pap., 442-H
18 Watanabe, A., Fukuoka, S., Yasutake, Y., and Kawaguchi, H. (2001) 'Groin arrangements made of natural willows for reducting bed deformation in a curved channel'. Advance in River Engineering, 7, 285-290
19 Parker, G., and Andrews, E.D. (1985). 'Sorting of bed load sediment by flow in meander bends'. Water Resour. Res., Vol. 21, No.9, pp.1361-1373   DOI
20 Sun, T., Meakin, P., and Jossang, T.(2001) 'A computer model for meandering rivers with multiple and bedload sediment sizes 2 Computer simulations'. Water Resour. Res., Vol. 37, No. 8, pp. 2243-2258   DOI   ScienceOn