Functions to describe object falling in the water

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webdreamer
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I'm doing a game where I have to simulate the effect on water when some object falls onto it, like a peeble on a pond. I've been playing around with decaying sinus functions, but I'm running out of time, and I haven't found the set of equations to describe it realistically. Since it's such a common subject, I know it must be done already, so I would like to know where can I find it.
 
Peeble on a pond? Decaying sinus functions?!

I'm curious, what is wrong with the "decaying" SINE function?