The Science Of Amber Waves Of Grain

Scientists have actually studied the fluid dynamics of rippling waves of wheat – like the ones referenced in the second line of "America the Beautiful " – with experiments like the one above, in which nylon filaments imitate tall stalks of grass and soap solution the air flowing over them.


FYFD's Nicole Sharp explains:

Flow visualization reveals the strong differences between flow above and between the grass. Vortices recirculate between the filaments at speeds much slower than the flow overhead. The instantaneous interaction of the high-speed freestream, the unsteady vortices, and the resistance of the grass results in familiar synchronous waves of grain.

[R Singh et al. via FYFD]



Today's news articles from Mr. Gonzalez:

-Is climate change affecting the dawn's early light?

-the science of the gleam visible during twilight hours.

-What is the maximum distance that the human eye can resolve a repeating pattern of star and stripe shapes during a wartime conflict, and can the flash from the detonation of an explosive device sufficiently illuminate the pattern during the darkness of night?