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040 |aCaOODSP|beng|erda|cCaOODSP
0410 |aeng|beng|bfre
043 |an-cn-ns|aln-----
0861 |aD68-21/25-1989E-PDF
1001 |aStaal, Philip Ralph, |eauthor.
24510|aPropagation-loss measurements and modelling for topographically smooth and rough seabeds / |cPhilip R. Staal - Francine Desharnais ; approved by R. S. Walker.
264 1|a[Dartmouth, N.S.] : |bNational Defence, Research and Development Branch, Defence Research Establishment Atlantic, |cJune 1989.
300 |a1 online resource (v, 34 pages) : |bgraphs.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aTechnical memorandum ; |v89/214
500 |aCover title.
500 |aDigitized edition from print [produced by Defence Research and Development Canada].
504 |aIncludes bibliographical references (pages 30-31).
5203 |a"Acoustic propagation loss data were obtained along two radial tracks from a receiving array at a site on the Scotian Shelf. One track was over a smooth seabed and the other over a rough seabed. The features of the propagation loss data for the two seabed types have been analyzed and compared. At-sea measurements show that fluctuations in the propagation loss data are correlated with water-depth variations for the case of the rough seabed. Two different propagation-loss modelling programs are used in an attempt to explain the acoustic features observed over the two seabeds. The majority of the modelled results were obtained with PROLOS, a DREA-developed range-dependent normal-mode program. The results of a ray-trace propagation loss model (GRASS) are also compared with the measured data. The ray-trace model provides insight on which acoustic transmission paths are most important, while PROLOS is able to model the propagation-loss over both the smooth and rough seabeds surprisingly well"--Abstract, page ii.
546 |aIncludes abstracts in English and French.
650 0|aUnderwater acoustics|zScotian Shelf|xMeasurement.
650 0|aSubmarine topography|zScotian Shelf.
650 6|aAcoustique sous-marine|zNéo-écossaise, Plateforme|xMesure.
650 6|aTopographie sous-marine|zNéo-écossaise, Plateforme.
7102 |aDefence Research Establishment Atlantic, |eissuing body.
830#0|aD.R.E.A. technical memorandum ;|v89/214.|w(CaOODSP)9.941838
85640|qPDF|s363 KB|uhttps://publications.gc.ca/collections/collection_2024/rddc-drdc/D68-21-25-1989-eng.pdf