Modeling of submarine cyclic steps: Controls on their formation, migration, and architecture

Abstract

Submarine cyclic steps are a newly recognized manifestation of fundamental morphodynamic instability of Froude-supercritical flow over an erodible bed. There is a growing recognition of the global presence and importance of cyclic steps. An attempt was made here to: (1) outline submarine cyclic steps in the context of the sediment waves of various origins; (2) elucidate the physics and key parameters governing their formation, migration, and architecture; and (3) summarize selected numerical experiments on netdepositional and net-erosional cyclic steps in a useful form. The paper also addresses frequent terminology confusion between netdepositional cyclic steps and sediment waves in general. © 2011 Geological Society of America.