This is a complicated subject. See for example
Levin & Hobbs, Phil.Trans.A269, 555-585, 1971, Splashing of water drops on solid and wetted surfaces...
Siscoe & Levin, J.Geophys.Res. 76, 5112-5116,1971 Water-drop-surface-wave interactions
Fukai et al. Phys.Fluids A5,2588-2599, 1993 Modeling of the deformation of a liquid droplet impinging on a flat surface
Those 3 are all about drops falling onto liquid or solid surfaces. No doubt there are lots of references on solid bodies falling into liquids.
John Harper