ESTIMATING SEA FLOOR ROUGHNESS FROM NORMALLY INCIDENT BROADBAND ACOUSTIC SIGNALS

Authors
  1. Dodds, J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);GeoAcoustics Inc, Aurora ONT (CAN)
Abstract
Two techniques are used to estimate sea floor roughness characteristics using normal incidence seismic data collected with a deep towed, high resolution (1-10 kHz) boomer source. In the bottom elevation spectrum technique, the seismic traveltimes are migrated (accounting for system depth variations), and the bottom topographic spectral density function is estimated from the migrated depth profile. In the sonogram inversion technique, the sea floor echo power as a function of frequency and time after the first arrival (1-10 kHz, 0-20 ms) is first calculated from the seismic signals. This function ("sonogram") is then predicted from sea floor roughness and volume scattering parameters using a theoretical model, and the model parameters are adjusted by a new iterative algorithm to fit the model to the observed sonogram.
Report Number
DREA-CR-90-421 — Contractor Report (Final)
Date of publication
15 May 1990
Number of Pages
69
DSTKIM No
90-04211
CANDIS No
66452
Format(s):
Hardcopy;Originator's fiche received by DSIS

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