  In this paper we consider the acoustic metric obtained from an Abelian Higgs
model extended with higher derivative terms in the bosonic sector which
describes an acoustic rotating black hole and analyze the phenomena of
superresonance, analogue Aharonov-Bohm effect and absorption. We investigate
these effects by computing the scalar wave scattering by a draining bathtub
vortex and discuss the physical interpretation of higher derivative terms.
Furthermore, we show that the absorption does not vanish as the draining
parameter tends to zero.
