Formation of 'Leaf Lines' in Pools: Causes & Solutions

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SUMMARY

The formation of 'leaf lines' in pools occurs due to a phenomenon known as "constrained boundary random walk." Leaves drift randomly across the pool's surface, influenced by wind and ripples. Upon contacting the pool's edges, the wet leaves adhere to the sides, leading to their accumulation at the boundaries. This process results in a statistical tendency for leaves to congregate at the edges over time.

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What causes objects (such as leaves) in the pool to group at the edges?
 
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The wet leaves stick to the sides of the pool.
It's called a "constrained boundary random walk" the leaves drift randomly over the surface, blown by wind + ripples but when the touch the side they stick. So statstically eventually all will end up on the edge of the pool.
 
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