TECHNICAL NOTES
Jun 1, 1986

Washload and Fine Sediment Load

Publication: Journal of Hydraulic Engineering
Volume 112, Issue 6

Abstract

Washload and fine sediment load should not be used synonymously. In streams with large concentrations of fines, the sediment size D10 may be much smaller than 0.0625 mm. The fluid becomes very viscous at low concentrations of clays and the reduced settling velocity inhibits the exchange of sediment particles between the bed and the suspension. The sediment transport capacity under those conditions remains very poorly defined. In coarse bed streams, sands and fine gravel can be considered as washload as long as the sediment transport capacity remains larger than the availability of sediment. Intermittently, different conditions prevail when the upstream supply exceeds the transport capacity.

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References

1.
Colby, B. R., “Fluvial Sediments—A Summary of Source, Transportation, Deposition, and Measurement of Sediment Discharge,” USGS Bulletin 1181‐A, 1963.
2.
Einstein, H. A., Anderson, A. G., and Johnson, J. W., “A Distinction Between Bed‐Load and Suspended Load in Natural Streams,” Trans. American Geophysical Union, Vol. 21, pt. 2, 1940, pp. 628–633.
3.
Einstein, H. A., “The Bed Load Function for Sediment Transportation in Open Channels,” Technical Bulletin 1026, U.S. Department of Agriculture, Soil Conservation Service, Washington, D.C., 1950.
4.
Einstein, H. A., and Chien, N., “Can the Rate of Wash Load be Predicted From the Bed‐Load Function?” Trans. American Geophysical Union, Vol. 34, No. 6, 1953, pp. 876–882.
5.
Einstein, H. A., and Chien, N., “Transportation of Sediment Mixture With Large Ranges of Grain Sizes,” Univ. of California, Institute of Engineering Research, Berkeley, Calif.; The Missouri River Division, Corps of Engineers, U.S. Army, Missouri River Division Sediment Series, No. 2, June, 1953.
6.
Nordin, C. F., Jr., “A Preliminary Study of Sediment Transport Parameters, Rio Puerco Near Bernardo, New Mexico,” USGS Professional Paper 462‐C, Washington, D.C., 1963.
7.
Nordin, C. F., Jr., “Aspects of Flow Resistance and Sediment Transport, Rio Grande Near Bernalillo, New Mexico,” USGS Water Supply Paper 1498‐H 1964.
8.
O'Brien, J. S., and Julien, P. Y., “Physical Properties and Mechanics of Hyperconcentrated Sediment Flows,” Proceedings, Specialty Conference on Delineation of Landslide, Flashflood and Debris Flow Hazards in Utah, Utah State Univ., Logan, Utah, June 14–15, 1984, pp. 260–279.
9.
Shen, H. W., “Wash Load and Bed Load,” River Mechanics, H. W. Shen, Ed., Fort Collins, Colo., 1971, pp. 11.1–11.4.
10.
Simons, D. B., Richardson, E. V., and Haushild, W. L., “Some Effects of Fine Sediments on Flow Phenomena,” USGS Water Supply paper 1498‐G, Washington, D.C., 1963.
11.
Woo, H. S., “Sediment Transport in Hyperconcentrated Flows,” thesis presented to Colorado State University at Fort Collins, Colo., in 1985, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

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Go to Journal of Hydraulic Engineering
Journal of Hydraulic Engineering
Volume 112Issue 6June 1986
Pages: 541 - 545

History

Published online: Jun 1, 1986
Published in print: Jun 1986

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Authors

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Hyoseop S. Woo
Grad. Student, Dept. of Civ. Engrg., Colorado State Univ., Ft. Collins, CO 80523
Pierre Y. Julien, M. ASCE
Asst. Prof., Dept. of Civ. Engrg., Colorado State Univ., Ft. Collins, CO 80523
Everett V. Richardson, F. ASCE
Prof., Dept. of Civ. Engrg., Colorado State Univ., Ft. Collins, CO 80523

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