  We investigate a quite strong turbulence in a supercritical fluid near a
gas-liquid critical point. Specifically, we consider a case in which the
Kolmogorov scale is much smaller than the equilibrium correlation length $\xi$.
Although equilibrium critical fluctuations are destroyed by turbulence, $\xi$
still provides a crossover length scale between two types of energy cascade. At
scales much larger than $\xi$, the Richardson cascade becomes dominant, whereas
at scales much smaller than $\xi$, another type of cascade, which we call the
van der Waals cascade, is induced by density fluctuations. Experimental
conditions required to observe the van der Waals cascade are also discussed.
