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iDEA: DREXEL LIBRARIES E-REPOSITORY AND ARCHIVES

iDEA: DREXEL LIBRARIES E-REPOSITORY AND ARCHIVES

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Mathematical modeling of scour around a bridge pier

Details
Title
Mathematical modeling of scour around a bridge pier
Author(s)
Mohapatra, Pranab K.
Keywords
Sediment transport; Fluvial hydraulics
Date
2006-09-13
Abstract
A numerical model to estimate the total scour around a bridge pier is presented in this work. The model neglects the long-term aggradation/degradation and the local scour is estimated by using the equations given in the NHI’s HEC 18 document. However, the contraction scour is estimated by numerical solution of the governing equations, which consist of the continuity and momentum equations for water flow and continuity equation for sediment flow. An explicit finite-difference formulation along with a TVD scheme is used for solving the flow equations. The numerical results for contraction scour are compared with those obtained by using empirical relations for hypothetical scenarios and the empirical values over-predict the maximum scour due to contraction. Match between the numerical and experimental results for maximum total scour depth and the equilibrium scour depth for a constant discharge indicate that the present numerical model is capable of predicting reliable results. When compared against those estimated by using the empirical relations mentioned in HEC 18, numerical results indicate much smaller values. The numerical model is also used to estimate the maximum scour depths for different scenarios by varying the inflow boundary conditions.
Citation
Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732
URI
http://hdl.handle.net/1860/1481
In Collections
Drexel Research

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