Introduction - Dune Worlds: How Windblown Sand Shapes Planetary Landscapes - page 8

Fig. 1.11 Morphologically
identical to dunes a thousand
times larger, these cm-scale
bedforms are generated in a water
tank in which a sediment-covered
platform (see Chap. 17 ) is moved
back and forth, rotated between
cycles to impose a desired 'wind
regime' to quantitatively explore
the dependence of morphology
on the angular diversity of winds.
Picture courtesy of Sylvain
Courrech du Pont
Fig. 1.12 The sand streaks and
falling dunes show a clear
corridor of sand transport across
the Arounga impact structure in
Chad in this image from the
International Space Station. The
crater is 12.6 km in diameter. On
Earth's young surface with
relatively few impact craters
there are few similar examples;
on Mars, craters tend to be traps
for sand. On Titan, many craters
appear to be partly overrun by
dunes. NASA Image