# If there is a secret math in sand megaripples…

Certain sand waves, with wavelengths between 30 centimeters (almost 12 inches) and several meters (around 30 feet), are known as megaripples: they’re between ordinary beach ripples and full dunes in size, and we’ve seen them not just on Earth, but even on other planets such as Mars, well known for its all-encompassing dust storms.

Aside from their size, a key characteristic of these middle-ground ripples is the grain size involved – a surface of coarse grains over an interior of much finer material. Yet this mix of grains is never the same, and nor are the winds that blow across the sand to create the ripples in the first place.

Now researchers have discovered a surprising mathematical feature of megaripples: Dividing the diameter of the coarsest grains in the mix with the diameter of the smallest grains always equals a similar number – something that hasn’t been spotted before across several decades of research.

David Nield, “There’s a Hidden Mathematical ‘Law’ in The Sand Megaripples Found All Over Earth” at ScienceAlert (January 13, 2022)

How would fundamental design come to exist if this were not a designed universe?

## 3 Replies to “If there is a secret math in sand megaripples…”

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polistra says:

Coarse grains always come to the top when shaken. Finer grains fall between the coarse ones. It makes sense that the relative diameters are proportional.

Assuming round grains, the available gap (the sieve) between big grains is the same proportion of their size. In an idealized situation, a fallable small grain is about 15% of the large grains. Ten-foot boulders will let 1.5 foot rocks fall. 10 millimeter grains will let 1.5 millimeter particles fall.

Idealized picture:

http://ockhamsbungalow.com/blog143/big-small.jpg

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martin_r says:

And here is a designed species that creates sand design…