Scour Due to Riprap and Improper Filters
Publication: Journal of Hydraulic Engineering
Volume 110, Issue 10
Abstract
Scour is usually associated with high velocities, elevated levels of turbulence, and negative piezometric gradients. Riprap and filters have been used to eliminate scour from these sources. Attention is drawn to piezometric gradients stemming from different levels of, water about hydraulic structures and to the scour which might result from these gradients. A flow scheme is presented which demonstrates how piezometric gradients might be magnified in the vicinity of riprap; the magnified gradients could increase the amount of scour. Also, the flow scheme results in elevated pressures which tend to dislodge the riprap. In addition to controlling leaching, it is pointed out in this paper how proper filters eliminate both the magnified gradients and elevated pressures. Scour in a channel due to such natural occurrences as ponding, rainfall, and irrigation in the vicinity of a channel is examined.
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References
1.
Cedergren, Harry R., “Seepage, Drainage, and Flow Nets,” 2nd ed., John Wiley and Sons, New York, N.Y. 1977.
2.
Posey, Chesley J., “Erosion Prevention Experiments,” Proceedings of the 13th Congress, International Association for Hydraulic Research, Vol. 2, Aug. 31–Sept. 5, 1969, pp. 211–219.
3.
Posey, Chesley J., “Permanent Erosion Protection for Inland Waterways?,” Bulletin of the Permanent International Association of Navigation Congresses, Vol. II, No. 30, 1978, pp. 28–29.
4.
Posey, Chesley J., “How About Reverse Filters?,” Civil Engineering, ASCE, Apr., 1980, pp. 78–79.
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Copyright © 1984 ASCE.
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Published online: Oct 1, 1984
Published in print: Oct 1984
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