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Treatment of natural geometry in finite volume river flow computations

DSpace at IIT Bombay

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Title Treatment of natural geometry in finite volume river flow computations
 
Creator CAPART, H
ELDHO, TI
HUANG, SY
YOUNG, DL
ZECH, Y
 
Subject open-channel flows
experimental water transients
hyperbolic conservation-laws
free-surface flows
sewer pipes
equations
schemes
simulation
model
open-channel flow
algorithms
geometry
flood routing
river systems
 
Description A method is proposed for the treatment of irregular bathymetry in one-dimensional finite volume computations of open-channel flow. The strategy adopted is based on a reformulation of the Saint-Venant equations. In contrast with the usual treatment of topography effects as source terms, the method accounts for slope and nonprismaticity by modifying the momentum flux. This makes it possible to precisely balance the hydrostatic pressure contributions associated with variations in valley geometry. The characteristic method is applied to the revised equations, yielding topographic corrections to the numerical fluxes of an upwind scheme. Further adaptations endow the scheme with an ability to capture transcritical sections and wetting fronts in channels of abrupt topography. To test the approach, the scheme is first applied to idealized benchmark problems. The method is then used to route a severe flood through a complex river system: the Tanshui in Northern Taiwan. Computational results compare favorably with gauge records. Discrepancies in water stage represent no more than a fraction of the magnitude of typical bathymetry variations.
 
Publisher ASCE-AMER SOC CIVIL ENGINEERS
 
Date 2011-07-18T15:03:22Z
2011-12-26T12:50:41Z
2011-12-27T05:36:39Z
2011-07-18T15:03:22Z
2011-12-26T12:50:41Z
2011-12-27T05:36:39Z
2003
 
Type Article
 
Identifier JOURNAL OF HYDRAULIC ENGINEERING-ASCE, 129(5), 385-393
0733-9429
http://dx.doi.org/10.1061/(ASCE)0733-9429(2003)129:5(385)
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4961
http://hdl.handle.net/10054/4961
 
Language en