The use of relative celerities of bed forms to compute sediment transport in the Paraná River

VIONNET CA; MARTI CL; AMSLER M; RODRÍGUEZ LB

IAHS Publication

IAHS Press, International Association of Hydrological Sciences

Lugar: Wallingford, UK; Año: 1998 vol. 249 p. 399 - 406

0144-7815

In this work the problem of modelling movable bed flows is partially addressed by considering the relative magnitude of the celerities at which disturbances on the water surface and on the bed propagates. Part of the interest in computing bed form celerities is to estimate the total sediment load transported by the Paraná River. To this end, the relative celerities implied by different transport formulae are determined by a linear stability analysis of the Exner approximation to the shallow-water equations. Then, nonlinear celerities are calculated numerically by perturbing the sediment load flowing into a uniform channel of similar slope and roughness as those encountered in the Paraná River. Finally, by matching numerical results with recorded field data of dune migration, a representative value of the total sediment load of the Paraná River is obtained.