Comparisons of model results with field data in which target trawls were used to sample krill length distributions were also made. This project was supported by the Antarctic Science Advisory Grants Scheme. This project calls for the establishment of a sound source and several receivers within the ocean basin to allow measurements of acoustic travel time over basin length scales to be made. CMST activities have been directed to studies of deep water long range propagation, and to participation in planning workshops for the project. A CMST airgun and a range of implosive devices are being used as sources and moored hydrophones as receivers.
Propagation modelling using normal mode and parabolic equation techniques is employed.
A line array is presently under construction and field work is being carried out at a number of continental shelf locations around Australia. The shallow water work has been carried out in support of the bioacoustic program described below, and as part of a broader program to characterise propagation conditions in the region. The CMST component of the survey involved the design, construction and deployment of a low frequency noise logger in 1.6km deep water at the site, together with later data analysis. CMST also carried out an analysis of shipping statistics, movements and noise propagation to the site. Mr. R.D. McCauley, J.D. Penrose, A.J. Duncan A major project to investigate the effect of sound generated by offshore seismic surveys on marine life commenced in 1996.