Geological feature resulting from the movement of bed material by fluid flow
Current ripples preserved in sandstone of the Moenkopi Formation, Capitol Reef National Park, Utah, United States.
A bedform is a geological feature that develops at the interface of fluid and a moveable bed, the result of bed material being moved by fluid flow. Examples include ripples and dunes on the bed of a river. Bedforms are often preserved in the rock record as a result of being present in a depositional setting. Bedforms are often characteristic to the flow parameters,[1] and may be used to infer flow depth and velocity, and therefore the Froude number.
^Southard, J B (1991). "Experimental Determination of Bed-Form Stability". Annual Review of Earth and Planetary Sciences. 19: 423–455. Bibcode:1991AREPS..19..423S. doi:10.1146/annurev.ea.19.050191.002231.
A bedform is a geological feature that develops at the interface of fluid and a moveable bed, the result of bed material being moved by fluid flow. Examples...
An antidune is a bedform found in fluvial and other channeled environments. Antidunes occur in supercritical flow, meaning that the Froude number is greater...
Hall, Minard; Ramón, Patricio; Dingwell, Donald B. (2013-10-13). "Dune bedforms produced by dilute pyroclastic density currents from the August 2006 eruption...
varying speeds and velocities produce different structures, are called bedforms. In the lower flow regime, the natural progression is from a flat bed,...
In geology, ripple marks are sedimentary structures (i.e., bedforms of the lower flow regime) and indicate agitation by water (current or waves) or directly...
characteristic of turbidity currents. The surface of a particular bed, called the bedform, can also be indicative of a particular sedimentary environment. Examples...
regolith components identified at landing sites. Typical examples include: bedform (a feature that develops at the interface of fluid and a moveable bed such...
next blows in the dominant direction. Draas are very large-scale dune bedforms; they may be tens or a few hundreds of metres in height, kilometres wide...
represented by sand-flow maps. These are based on meteorological observations, bedform orientations, and trends of yardangs. They are analogous to drainage maps...
R. et al., in press, 'The Role of Bio-physical Cohesion on Subaqueous Bedform Size', Geophysical Research Letters, February, 2016. Malarkey, J., Baas...
slope Stream pool Thalweg Bedrock river Canyon Knickpoint Plunge pool Bedforms Ait Antidune Dune Current ripple Regional processes Aggradation Base level...
such as ripples, dunes, or antidunes on the river or stream bed. These bedforms are often preserved in sedimentary rocks and can be used to estimate the...
models to make topographical depictions of unknown glacial features and bedforms. Newfound glacial features include an ice-sculptured bedrock surface, residual...
with tidal currents. Wave action is much more important for determining bedforms of sediments deposited along mesotidal and microtidal coasts than in macrotidal...
slope Stream pool Thalweg Bedrock river Canyon Knickpoint Plunge pool Bedforms Ait Antidune Dune Current ripple Regional processes Aggradation Base level...
23 April 2011. Blodgett, R.H.; Stanley, K.O. (1980). "Stratification, Bedforms, and Discharge Relations of the Platte Braided River System, Nebraska"...
Cyclic steps are rhythmic bedforms associated with Froude super-critical flow instability. They are a type of sediment wave, and are created when supercritical...
flow velocities determined from grain size and bedforms. The river flow direction, based upon bedform orientations and bone elongation statistics, was...
and viscosity, and can therefore not exert very much shear on its bed. Bedforms are generated by aeolian sediment transport in the terrestrial near-surface...
Rebecca M.; Stack, Kathryn M. (2021). "A Rock Record of Complex Aeolian Bedforms in a Hesperian Desert Landscape: The Stimson Formation as Exposed in the...
the smallest grains at the top. Also, Ripples, which are the smallest bedform type, and dunes, which are similar to ripples except are larger. Carbonaceous...
Broadcasting Corporation. Retrieved 9 May 2015. Harris, P. T. (1988). "Sediments, bedforms and bedload transport pathways on the continental shelf adjacent to Torres...
current ripples spread out and merge on the basin floor. These sedimentary bedforms are best seen in aerial images and at low sun angles. These giant current...
descend from the polar high to transport ice and create large wavelength bedforms. The spiral shape comes from Coriolis effect forcing of the winds, much...
also the primary indicator of the lower part of the upper flow regime bedform. Parting lineation is a sedimentary structure commonly found on the surface...
ISBN 978-0-902246-04-1. Shaw, John (April 2002). "The meltwater hypothesis for subglacial bedforms". Quaternary International. 90 (1): 5–22. Bibcode:2002QuInt..90....5S....
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