LAUSR

Realistic estimates of geoacoustic parameters from transmission loss (TL) measurements in the presence of swim bladder bearing fish may be derived by application of the concurrent bio and geo inversion method (Diachok and Wales, 2005; Diachok and Wadsworth, 2014). This method was applied to Qiu’s, (1999) TL measurements in the Yellow Sea. Qiu’s measurements were made in August, south of the Shandong Peninsula, where the bottom is composed of sand, and the concentration of anchovies, the dominant species in the Yellow Sea, is high, at night when anchovies are dispersed near the surface and bio-alpha is relatively high. The measured attenuation coefficient (TS—cylindrical spreading—absorption) was nearly 8 dB/km at the resonance frequency of anchovies. Inverted values of bioacoustic parameters were consistent with bioacoustic parameters of anchovies. Inverted geoacoustic parameters were consistent with geoacoustic properties of sand. Disregard of the effects of bio-alpha on TL resulted in unrealistically hi...