Conference proceeding
Channel Curvature Effects on the Critical Froude Number for Shear Failure of Riprap Stones Used to Protect Abutments against Erosion
PROCEEDINGS OF THE 39TH IAHR WORLD CONGRESS, pp.2282-2289
01/01/2022
DOI: 10.3850/IAHR-39WC2521716X2022663
Abstract
The present paper describes a methodology based on fully, three-dimensional numerical simulations to improve the performance and range of applicability of riprap size design formulas used for erosion protection at spill-through abutments. In this method, the bed shear stress distributions are obtained from RANS simulations conducted in straight and curved open channels containing identical abutments at their two banks. For each channel/abutment configuration, a series of simulations is performed to determine the critical Froude number, Fr, corresponding to the shear-failure entrainment threshold when the maximum bed shear stress over the riprap apron is equal to the threshold value for shear failure. Using the data sets generated using these series of numerical simulations, a two-parameter design formula for riprap size selection at spill-through abutments is derived. The new design formula retains the same functional relationship as that of commonly used design formulas in which the nondimensional riprap diameter is a function of the critical Froude number (D-50)/y=C-alpha/2*Fr-alpha, where D-50 is the median diameter of the riprap and y is the local flow depth next to the toe of the abutment). In the new formula, the model parameters, C and alpha, rather than being constants, are a function of the main nondimensional geometrical parameters, like the nondimensional radius of curvature of the channel and the floodplain width.
Details
- Title: Subtitle
- Channel Curvature Effects on the Critical Froude Number for Shear Failure of Riprap Stones Used to Protect Abutments against Erosion
- Creators
- Hao Wu - Univ Iowa, Dept Civil & Environm Engn, IIHR Hydrosci & Engn, Iowa City, IA 52242 USAJie Zeng - South Florida Water Management Dist, W Palm Beach, FL 33406 USAGeorge Constantinescu - Univ Iowa, Dept Civil & Environm Engn, IIHR Hydrosci & Engn, Iowa City, IA 52242 USA
- Contributors
- M Ortega-Sanchez (Editor)
- Resource Type
- Conference proceeding
- Publication Details
- PROCEEDINGS OF THE 39TH IAHR WORLD CONGRESS, pp.2282-2289
- Publisher
- Iahr-Int Assoc Hydro-Environment Engineering Research
- DOI
- 10.3850/IAHR-39WC2521716X2022663
- ISSN
- 2521-7119
- eISSN
- 2521-716X
- Number of pages
- 8
- Grant note
- MATC 15801350/15243500 / Mid-America Transportation Center (MATC)
- Language
- English
- Date published
- 01/01/2022
- Academic Unit
- IIHR--Hydroscience and Engineering; Civil and Environmental Engineering
- Record Identifier
- 9984580316802771
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