That perturbation becomes much more complicated when many large particles are released at once, each with its own wake that affects its neighbors. So, the falling particles start to shift ...

But when many particles fall together, things get more interesting. “If a large number of particles are released at the same time, neighboring particles experience this flow perturbation ...

"It causes sedimenting (falling) particles to be progressively shifted horizontally, which leads to an expanding circular distribution of the particles." When particles reach the bottom rapidly ...

“It causes sedimenting (falling) particles to be progressively shifted horizontally, which leads to an expanding circular distribution of the particles.” When a large amount of salt is poured ...