Numerical Simulation of Widening and Bed Deformation of Straight Sand-Bed Rivers. II: Model Evaluation
Publication: Journal of Hydraulic Engineering
Volume 122, Issue 4
Abstract
In this paper the numerical model presented in the companion paper is tested and applied. Assessment of model accuracy was based on two approaches. First, predictions of evolution of a 13.5 km reach of the South Fork of the Forked Deer River, in west Tennessee, were compared to observations over a 24-yr period. Results suggest that although the model was able to qualitatively predict trends of widening and deepening, quantitative predictions were not reliable. Simulated widths and depths were within 15% of the corresponding observed values, but observed change in these parameters at the study sites were also close to these values. Simulated rates of depth adjustment were within 15% of observed rates, but observed rates of channel widening at the study sites were approximately three times those simulated by the model. In the second approach, the model was used to generate relationships between stable channel width and bank-full discharge. The model was able to successfully replicate the form of empirically derived regime-width equations. Simulations were used to demonstrate the model's ability to obtain more realistic predictions of bed evolution in widening channels.
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References
1.
Ashley, G. H. (1910). “Drainage problems in Tennessee.”Tennessee State Geol. Surv. Bull., 3-A, 1–15.
2.
Darby, S. E. (1994). “A physically-based numerical model of river channel widening,” Ph.D. thesis, University of Nottingham, Nottingham, England.
3.
Darby, S. E., and Thorne, C. R.(1994). “Prediction of tension crack location and riverbank erosion hazards along destabilized channels.”Earth Surf. Proc. Lndfrms., 19, 233–245.
4.
Darby, S. E., and Thorne, C. R.(1996). “Numerical simulation of widening and bed deformation in straight sand-bed rivers. I: Model development.”J. Hydr. Engrg., ASCE, 122(4), 184–193.
5.
Dury, G. H.(1961). “Bankfull discharge: an example of its statistical relationships.”Bull. Int. Assoc. Sci. Hydrol., 6, 48–55.
6.
Henderson, F. M. (1966). Open channel flow . Macmillan, New York, N.Y.
7.
Hey, R. D. (1975). “Design discharges for natural channels.”Science and technology in environmental management, R. D. Hey and J. D. Davies, eds., Saxon House, Farnborough, England, 73–88.
8.
Hupp, C. R., and Simon, A. (1986). “Vegetation and bank-slope development.”Proc., 4th Federal Interagency Sedimentation Conf., Las Vegas, Nevada, 5-83–5-92.
9.
Hupp, C. R., and Simon, A.(1991). “Bank accretion and the development of vegetated depositional surfaces along modified alluvial channels.”Geomorphology, 4, 111–124.
10.
Inglis, C. C.(1963). “Discussion of `Uniform water conveyance channels in alluvial materials' by Simons and Albertson,”Trans., ASCE, 128, 129–134.
11.
Leopold, L. B., and Wolman, M. G. (1957). “River channel patterns—braided, meandering and straight.”Profl. Paper, U.S. Geological Survey, Washington, D.C., 282B.
12.
Lorenz, E.(1963). “Deterministic nonperiodic flow.”J. Atmos. Sci., 20, 130–141.
13.
Osman, A. M., and Thorne, C. R.(1988). “Riverbank stability analysis I: Theory.”J. Hydr. Engrg., ASCE, 114(2), 134–150.
14.
Richards, K. S.(1977). “Channel and flow geometry: a geomorphological perspective.”Prog. in Physical Geography, 1, 65–103.
15.
Robbins, C. H., and Simon, A. (1983). “Man-induced channel adjustment in Tennessee streams.”Water-Resour. Investigations Rep. 82-4098, U.S. Geological Survey, Washington, D.C.
16.
Simon, A.(1989). “A model of channel response in disturbed alluvial channels.”Earth Surf. Proc. Lndfrms., 14, 11–26.
17.
Simon, A., and Hupp, C. R. (1986a). “Channel evolution in modified Tennessee channels.”Proc., 4th Federal Interagency Sedimentation Conf., Las Vegas, Nev., 5-71–5-82.
18.
Simon, A., and Hupp, C. R. (1986b). “Channel widening characteristics and bank slope development along a reach of Cane Creek, West Tennessee.”Selected papers in the hydrological sciences, S. Subitzky, ed., Water-Supply Paper 2290, U.S. Geological Survey, Washington, D.C., 113–126.
19.
Simon, A., and Hupp, C. R.(1987). “Geomorphic and vegetative recovery processes along modified Tennessee streams: An interdisciplinary approach to disturbed fluvial systems.”Int. Assoc. Scientific Hydro. Spec. Publ., 167, 251–262.
20.
Simon, A., and Hupp, C. R. (1992). “Geomorphic and vegetative recovery processes along modified stream channels of West Tennessee.”Open-File Rep. 91-502, U.S. Geological Survey, Washington, D.C.
21.
Simon, A., and Robbins, C. H.(1987). “Man-induced gradient adjustment of the South Fork Forked Deer River, West Tennessee.”Envir. Geol. and Water Sci., 9, 109–118.
22.
Simon, A., Wolfe, W. J., and Molinas, A. (1991). “Mass wasting algorithms in an alluvial channel model.”Proc., 5th Federal Interagency Sedimentation Conf., Las Vegas, Nev., Vol. 2, 8-22–8-29.
23.
Simons, D. B., and Albertson, M. L.(1963). “Uniform water conveyance channels in alluvial materials.”Trans., ASCE, 128, 65–106.
24.
Thorne, C. R., and Osman, M. A. (1988a). “The influence of bank stability on regime geometry of natural channels.”River regime, W. R. White, ed., John Wiley and Sons, Chichester, England, 135–147.
25.
Thorne, C. R., and Osman, M. A.(1988b). “Riverbank stability analysis II: Applications.”J. Hydr. Engrg., 114(2), 151–172.
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Published In
Journal of Hydraulic Engineering
Volume 122 • Issue 4 • April 1996
Pages: 194 - 202
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: Apr 1, 1996
Published in print: Apr 1996
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