  Laboratory experimental results are presented for nonlinear Internal Solitary
Waves (ISW) propagation in deep water configuration with miscible fluids. The
results are validated against direct numerical simulations and traveling wave
exact solutions where the effect of the diffused interface is taken into
account. The waves are generated by means of a dam break and their evolution is
recorded with Laser Induced Fluorescence (LIF) and Particle Image Velocimetry
(PIV). In particular, data collected in a frame moving with the waves are
presented here for the first time. Our results are representative of
geophysical applications in the deep ocean where weakly nonlinear theories fail
to capture the characteristics of large amplitude ISWs from field observations.
