Riprap Resistance Tests From a Large Test Channel
Final rept. Feb-Apr 1991
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB
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Results from resistance tests conducted in a large test channel are in agreement with previous tests in rectangular tilting flumes. Flow resistance for riprap is best described by the Strickler equation, which can be derived from the power law equation for velocity profiles. The coefficient in Stricklers equation from the large test channel was 2.4 percent greater than from the rectangular tilting flumes. Results from this study suggest that the logarithmic equation is not valid for intermediate scale roughness. Riprap placed to simulate underwater placement had an n value 13 percent greater than riprap placed in dry conditions, where the rock surface is much smoother.
- Hydrology, Limnology and Potamology
- Fluid Mechanics