The details of how sedimentary
processes ultimately create the stratigraphic record are the result of complex
interactions among many influences. Here, Sittoniet al. investigate sediment transport processes and alluvial sedimentary
deposits formed by topography driven flow expansions, a deposition mechanism
which complements with the parallel and recognized research thread of jet
driven deposits. In topographic flow expansions, coupled topography and flow (not only flow, as in jets
expansions) determine the characteristics of the deposits. The flow regime over
topographic expansions is unchannelized at large aspect (flow width to depth)
ratio. The characteristic depositional body produced by topographic flow
expansions is a relatively thin, tabular sand body with flat base and slightly
convex top, comparable to some "sheet flood" deposits described in
the stratigraphic record. This work improves understanding and predictive
capabilities of occurrence and characteristics of these deposits, and may be
significant for subsurface exploration.
Geometry, flow, and sediment transport of alluvialdeposits induced by topographically driven flow expansions by Luca Sittoni, Chris Paola, and Vaughan Voller
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