Subject: Formulas to calculate certain parameters after Comet Impact?

Hello,
I'm currently doing a project in Computer Sciences, but the question 
mainly relates to physics.  Basically what I'm doing is creating a 
simulation of the impact of a comet on the earth or any other planet.

Now, I already have the formulas to calculate the force of impact, the 
crater diameter, the tidal wave height and several others, but there are 
some that I would like to know.

I would like to calculate the radius of the airbust that occurs during 
impact, the hole in the atmosphere after the comet enters and any other 
calculations that I may need to have to simulate a fairly well done 
simulation.  3D graphics are no problem, and I've already done the most 
important things like the crater and the tidal wave movement and height, 
but I'm going for a little extra umph, so any help would be extremely 
appreicated.

A website or PDF document would be nice (I knew I found one on the net 
relating to the impact of a comet and many different calculations, but I 
lost it), but straight out help would be great as well.

Thanks very much, it is greatly appreciated,

Re: Formulas to calculate certain parameters after Comet Impact?