2 upvotes, 1 direct replies (showing 1)
View submission: Earthwork fishing infrastructure on north sentinel island?
I wish I could share images because it’d make things a lot easier to point out. Can I DM you?
The eastern portion was the one left mostly intact after the earthquake. So many of the exposed coral reefs are not what I’m talking about in specific.
More so I’m trying to point out jutting earthen piers with bulbous ends, looks like how we would design a pier. They are very small and you can’t see them unless you zoom almost all the way.
They are thickest at the bulb of earth at the end they don’t taper into a thicker piece of earth.
Comment by 7LeagueBoots at 29/01/2025 at 00:12 UTC
4 upvotes, 1 direct replies
That’s exactly what I suspected you were looking at.
Those are what I described, a result of the flow of water. Look at the labeled photo in this link[1]. See those areas marked as ‘sand bars’? What you’re looking at is a variation of this same structure.
1: https://beachsafe.org.au/surf-safety/ripcurrents
You get a thing called beach cusps in many areas, around 19 minutes into this video of beach morphology they’re discussed[2]. Depending on the specifics of the local environment they can take on a variety of shapes. Usually they’re more pointed at the end[3], but in an area with coral, lagoons, uplift, a sea floor that doesn’t just slope down evenly, etc it can get complicated and other shapes can emerge.
2: https://www.youtube.com/watch?v=6_RSalJ1Zo8
3: https://coastalcare.org/2016/12/beach-cusps-shoreline-symmetry-by-gary-griggs/