BEN BOLDT INSTRUMENTS SERIES
In the insets, the time–distance series of Δ S υ over the selected range is shown. The vertical gray dashed line shows the distance at which the threshold 10 E noise is attained.
Shown in (b)–(f) are relative backscattering strength s υ computed using the combination of (3) and (5) (red) and following Deines (1999 black) for the same datasets as in Fig. 1a: This difference will appear in (3) and will artificially increase s υ. (a) Difference between the intensity profiles computed using (9) and (10), as in Fig. The datasets used are (b) ANTARES, where the anomalous data around R = 48 and 63 m are due to reflections on other instruments (c) PROCS (d) LOCO (e) INP, where the red band for R > 40 m corresponds to data beyond the water surface and (f) DOC. A distance–time series of the RSSI data is shown in the insets, with the ordinate axis being correctly oriented.
The horizontal gray line represents E = E noise + δE noise. Shown in (b)–(f) are comparisons between the measured and theoretical RSSI profiles: the minimum and maximum RSSI profiles (blue line), the time-averaged RSSI values using a geometric average (green line), and the results from (9) with the parameters listed in Table 2 that fit best with the minimum, geometrically averaged, and maximum profiles (dotted red lines). (a) Comparison of the intensity profiles computed using (9) and (10): the new equation proposed in this study (solid line) and the one obtained following Deines (1999 dots) α and k cE noise (gray line) correspond to the case 3 in Table 2, and the three curves correspond to A = A min, A mean, and A max.
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