Four. Pattern in Free Dunes
Published Online: 27 MAR 2013
Copyright © 2013 John Wiley & Sons, Ltd.
Dunes: Dynamics, Morphology, History
How to Cite
Warren, A. (2013) Pattern in Free Dunes, in Dunes: Dynamics, Morphology, History, John Wiley & Sons, Oxford. doi: 10.1002/9781118295786.ch4
- Published Online: 27 MAR 2013
- Published Print: 20 MAY 2013
Print ISBN: 9781444339697
Online ISBN: 9781118295786
- dune pattern;
- linear dunes;
- transverse dunes;
- wind-directional regimes
Pattern includes both the three-dimensional shape of individual dunes and the pattern of groups of dune. This chapter is about prototype patterns, defined as those: (1) whose essential features are replicated over extensive areas; (2) that persist over long periods of time, despite a continuous throughput of sand (even, in some cases, despite a change of winds); (3) that are composed of elements that maintain their essential characteristics and relationships as they move downwind (in transverse dunes), are elongated (in linear dunes) or grow upward (in star dunes); (4) that occur in some extraterrestrial atmospheres, as on Mars, Venus or Titan; and (5) that are active, and without a history beyond the time they take to form. The central assumption in this chapter is that wind directionality is the primary control of the differentiation of pattern, an assumption that is shared by most of the literature on dune pattern.