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2 - Channel-scale erosional bedforms in bedrock and in loose granular material: character, processes and implications

Published online by Cambridge University Press:  04 May 2010

By
Paul A. Carling ,
Jürgen Herget ,
Julia K. Lanz ,
Keith Richardson  and
Andrea Pacifici
Edited by
Devon M. Burr ,
Paul A. Carling  and
Victor R. Baker
Devon M. Burr
Affiliation:
University of Tennessee
Paul A. Carling
Affiliation:
University of Southampton
Victor R. Baker
Affiliation:
University of Arizona
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Summary

Summary

High-energy fluid flows such as occur in large water floods can produce large-scale erosional landforms on Earth and potentially on Mars. These forms are distinguished from depositional forms in that structural and stratigraphical aspects of the sediments or bedrock may have a significant influence on the morphology of the landforms. Erosional features are remnant, in contrast to the depositional (constructional) landforms that consist of accreted waterborne sediments. A diversity of erosional forms exists in fluvial channels on Earth at a range of scales that includes the millimetre and the kilometre scales. For comparison with Mars and given the present-day resolution of satellite imagery, erosional landforms at the larger scales can be identified. Some examples include: periodic transverse undulating bedforms, longitudinal scour hollows, horseshoe scour holes around obstacles, waterfalls, plunge pools, potholes, residual streamlined hills, and complexes of channels. On Earth, many of these landforms are associated with present day or former (Quaternary) proglacial landscapes that were host to jökulhlaups (e.g. Iceland, Washington State Scablands, Altai Mountains of southern Siberia), while on Mars they are associated with landscapes that were likely host to megafloods produced by enormous eruptions of groundwater. The formative conditions of some erosional landforms are not well understood, yet such information is vital to interpreting the genesis and palaeohydraulic conditions of past megaflood landscapes. Correct identification of some landforms allows estimation of their genesis, including palaeohydraulic conditions. Kasei Valles, Mars, perhaps the largest known bedrock channel landscape, provides spectacular examples of some of these relationships.

Type
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Information
Megaflooding on Earth and Mars , pp. 13 - 32
Publisher: Cambridge University Press
Print publication year: 2009

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