Numerical nonlinear analysis of alternate-bar formation and overdeepening under superresonant conditions (abstract)

Numerical nonlinear analysis of alternate-bar formation and overdeepening under superresonant conditions (poster)

Local geometrical perturbations in alluvial channels can generate a pattern of alternate bars called ‘overdeepening’. Previous linear analyses and laboratory experiments showed that these bars arise downstream of perturbations in the relatively narrow and deep channels corresponding to subresonant conditions, but both upstream and downstream of...

Numerical simulations of upstream and downstream overdeepening

Local geometrical perturbations of alluvial channels can generate a pattern of non-migrating bars and pools. This phenomenon is known as “overdeepening”, because the pools locally enhance the scour in river bends. Overdeepening occurs only downstream of a perturbation if the channel is in the subresonant and subcritically damped regime, which...