MODELLING ROUGHNESS CHANGE DUE TO BED FORM GROWTH UNDER TRANSIENT FLOWS

Código

ENES20200070

Autores

William Bonino Rauen, Vinícius Granadier

Tema

11 - MODELAGEM HIDROSSEDIMENTOLÓGICA

Resumo

This study focused on the modelling capacity of unsteady resistance coefficients for hydraulic models. The specific aim was to adapt and test a calculation procedure for coefficient variation governed by roughness change due to bed form development under transient flow. An established method so far only used successfully under steady flow conditions was analysed through the lens of unsteady flow, adapted and used to simulate ripple growth in a wide channel reach with sand bed, with a triangular flow hydrograph as passing flood wave. The corresponding effects on water depth predictions were also contrasted with their counterparts obtained using a temporally constant resistance coefficient normally associated with equilibrium bed forms. Due to its highly parameterised nature, the new procedure can potentially contribute to improve modelling performance, cost-effectively, in such type of challenging simulation conditions.