  We have undertaken numerical simulations of galaxy interactions and mergers,
coupling the dynamics with the star formation history and the chemical
evolution. The self-gravity of stars and gas is taken into account through a
tree-code algorithm, the gas hydrodynamics through SPH, and an empirical law
such as a local Schmidt law is used to compute star formation. The gas and
stellar metallicity is computed at each position, according to assumed yields,
and the dust amount is monitored. At each step the spectra of galaxies are
computed, according to simple radiative transfer and dust models. Initial
conditions for these simulations will be taken from a large-scale cosmological
frame-work. The aim is to build a statistically significant library of merger
histories. The first results of the project will be discussed, in particular on
predictions about galaxy surveys at high redshift.
