Extracting the intrinsic geo-acoustic parameters from the effective geo-acoustic parameters

So far, most of the geoacoustic (GA) parameters are inverted through model-based approaches. The inverted GA parameters are not the intrinsic ones but the so-called “effective” ones. The “effective” GA parameters are model and frequency dependent and will be distorted due to model-mismatching. The real physical meaning of the term “effective” has not been fully addressed yet. In this paper we proposed to interpret the term of “effective” based on the Brekhovskikh’s reflection principle, which reveals how the GA parameters influence the Green’s function through the only channel, i.e. the bottom reflective coefficient. Based upon this point, we discuss the relationship between the “effective” GA parameters and the intrinsic GA parameters. First of all, it is shown that the real essential physical parameters, the reflective parameters, P(f) and Q(f) can be extracted from the “effective” GA parameters. Finally, with the help of P(f) and Q(f) some of the intrinsic GA parameters, the frequency dependence of the...