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Title: Wave stability study of riprap-filled cells : hydraulic model investigation
Authors: Markle, Dennis G.
Keywords: Riprap
Bank protection
Bank erosion
Soil erosion
Bank stability
Erosion control
Hydraulic models
Wave action
Water waves
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; HL-83-2.
Description: Miscellaneous Paper
Abstract: Both two-dimensional and three-dimensional hydraulic model investigations were conducted to test the stability of a new streambank protection concept when exposed to short-period wave attack. The concept, referred to as "Riprap-Filled Cells," consists of containerizing riprap in various sizes of cells. Based on the 1:4-scale (model:prototype) model tests and results for the "riprap-filled cells" placed on 1V-on-2H streambank slopes that are assumed to be stable and impermeable and for angles of wave attack of 90, 60, and 30 deg, it is concluded that: (A.) one-ft-cube cells (full and half-full of 0.6- to 4.6-lb riprap) are stable (no streambank exposure) for 2.0-sec, 1.0- to 1.75-ft, 4.0-sec, 1.0- to 3.0-ft, and 6.0-sec, 1.0- to 2.5-ft nonbreaking waves; (B.) rectangular cells (half-full of 0.6- to 4.6-lb riprap) are stable for nonbreaking wave heights up to and including 1.5 ft for wave periods of 2.0 and 6.0 sec. Wave heights exceeding this produce spot exposures of the streambank; (C.) rectangular cells (full of 0.6- to 4.6-lb riprap) are stable for 6.0-sec, nonbreaking waves up to and including 2.0 ft. Wave heights exceeding 2.0 ft produced spot exposures of the streambank; (D.) both runup and rundown on all sections tested appear to be functions of wave steepness, relative depth, and angle of wave attack. The angles of wave attack, listed in descending magnitudes of runup and rundown produced, are 60, 90, and 30 deg. One-ft-cube cells, full of riprap, and rectangular cells, half-full of riprap, show trends of decreasing runup and rundown with increasing values of wave steepness and relative depth. Insufficient data are available for these trends to be well defined for the 1-ft-cube cells, half-full of riprap and the rectangular cells, full of riprap.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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