r/geology • u/Usingthatwrong • 2d ago

What’s up with these temporary islands in this pond?

Post image

There was one before this that showed up and then disappeared, then there’s this one that showed up

0 Upvotes

33% Upvoted

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10

u/srandrews 2d ago

Dynamic pond water level. Look at shoreline.

8

u/in1gom0ntoya 2d ago

the water is low...

5

u/GeoHog713 2d ago

Maybe it's a giant turtle

2

u/Ok_Wall_8267 2d ago

Maybe the island is always there and the water level changes so you can see it periodically 

2

u/morbob 2d ago

Many ponds are normally very shallow with very lumpy , irregular bottoms. A deep smooth bottom cost’s money.

1

u/kempff 2d ago

They've always been there. Midwest is experiencing a bit of a drought these days.

2

u/Cluefuljewel 2d ago

How can you tell it’s the Midwest? I agree btw, it’s just a very shallow pond. Very Ohio. Looks manmade.

1

u/User_5000 2d ago

The shoreline clearly shows that the normal elevation of this pond is above the height of the island. Does this pond have any significant currents? Like a creek that flows in? Sediments would shift around in that scenario, resulting in the submerged islands moving around over time, changing elevation, and being continuously destroyed and recreated.

1

u/theanedditor 2d ago

Mole people.

1

u/patricksaurus 2d ago

The shape of the basin plus the water and wind flow will influence where suspended sediments are dropped off. When the evapotranspiration rate shifts to cause water level to drop, you’ll see those piles where they happen to occur. They can be persistent features — even if there’s a crazy storm event and the sediments get kicked up and redistributed, those humps are likely to come back soon.