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Riprap Resistance Tests From a Large Test Channel

Stephen T. Maynord

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Abstract

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 Strickler's 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.

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What this paper is about

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 Strickler's 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.

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Available abstract

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 Strickler's 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.

Key concepts: Riprap, Channel (broadcasting), Geotechnical engineering, Geology, Flow (mathematics), Surface finish, Logarithm, Underwater

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