1887

Abstract

DEDICATED: "GLACIATIONS" The formation and preservation of aggrading standing waves, antidunes and humpback dunes is commonly recognized to be rare in the geologic record. Field examples from glacigenic deltas and subaqueous fan settings indicate that these structures might be considered as a characteristic feature of these depositional systems. The objective of this study is to provide an analysis of depositional facies and geometries, which have rarely been studied from three-dimensional exposures and interpret them in terms of flow processes. The requirements for the formation of these relatively rare bedforms are met within plane-wall jets emerging from melt-water conduits. Hydraulic jumps occur when the initial supercritical flows evolve into subcritical flows and cause the formation of stationary standing waves immediately downstream. High sediment load and rapid flow deceleration establish highly aggradational conditions and allow for the deposition and preservation of deposits of aggrading standing waves and humpback dunes.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.20148694
2012-06-04
2021-11-28
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20148694
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error