Journal article
Design Formula for Sizing Rock Riprap at Spill-Through Abutments in Compound Channels
Journal of hydraulic engineering (New York, N.Y.), Vol.147(10), p.6021012
10/01/2021
DOI: 10.1061/(ASCE)HY.1943-7900.0001919
Abstract
AbstractA numerically based investigation is carried out to determine the minimum median diameter of the riprap stone needed to avoid shear failure inside the riprap apron used to protect spill-trough abutments against erosion. The study considers identical spill-through abutments placed on the floodplains of a compound channel. Several series of Reynolds-averaged Navier-Stokes (RANS) simulations are conducted with varying floodplain width, Bf, ratio between the abutment length and the floodplain width, La/Bf, mean diameter of the riprap stone, D50, and channel curvature, R, to estimate the maximum Froude number, Fr, at which riprap stones in aprons placed at the base of spill-through abutments will resist shear failure by the flow. A design formula for riprap size selection in aprons protecting spill-through abutments is proposed. The formula is expressed as D50/y=C0.5α*Frα, where y is the flow depth next to the toe of the abutment. The two model parameters are C and α. Results show that α is only a function of Bf for abutments that do not extend until close to the main channel and α=1.85 for abutments extending over the whole width of the floodplain.
Details
- Title: Subtitle
- Design Formula for Sizing Rock Riprap at Spill-Through Abutments in Compound Channels
- Creators
- Hao Wu - University of IowaJie Zeng - South Florida Water Management DistrictGeorge Constantinescu - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of hydraulic engineering (New York, N.Y.), Vol.147(10), p.6021012
- Publisher
- American Society of Civil Engineers
- DOI
- 10.1061/(ASCE)HY.1943-7900.0001919
- ISSN
- 0733-9429
- eISSN
- 1943-7900
- Language
- English
- Date published
- 10/01/2021
- Academic Unit
- IIHR--Hydroscience and Engineering; Civil and Environmental Engineering
- Record Identifier
- 9984197274102771
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