On Modeling High-Frequency Acoustic Scatter from a Basic Arctic Under-Ice Experiment: The Benchmark Ice-Block Problem

• Main Authors: Chin-Bing, Stanley A., Murphy, Joseph E., Keiffer, Richard S.
• Other Authors: NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS
• Format: Text
• Language: English
• Published: 1990
• Subjects: Snow; Ice and Permafrost; Acoustics; *COMPUTERIZED SIMULATION; HIGH FREQUENCY; EXPERIMENTAL DATA; MODELS; EDGES; FINITE ELEMENT ANALYSIS; ACCURACY; ICE; DIFFRACTION; SOUND TRANSMISSION; CANOPIES; ACOUSTIC SCATTERING; UNDERWATER ACOUSTICS; ARCTIC REGIONS; UNDERICE; SCATTERING; DD298 ONLY; ICE CANOPIES; PE61153N; WUDN257033; SEA ICE; COMPUTERIZED SIMULATION; ACOUSTIC WAVES/SCATTERING; SEISMIC WAVES; Arctic; Ice; permafrost; Sea ice
• Online Access: http://www.dtic.mil/docs/citations/ADA230003; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA230003

High-frequency underwater acoustic propagation and scattering in the presence of the underside of the Arctic ice canopy have been studied in the last decade. Promising computer simulation models and some good experimental data have resulted from these studies. While presenting a brief overview of the Arctic modeling achievements, this talk concentrates primarily on the need for more benchmark modeling-experimental efforts. The ice-block reverberation experimental data taken by Francois and Garrison is used as an illustration. Under-ice acoustic scattering models based on various approaches (Kirchhoff, edge diffraction, and finite element) are used to analyze the ice-block data and comparisons of accuracy versus computation effort will be presented. The presentation concludes with the suggestion that a need exists for more Arctic under-ice acoustic benchmark cases. (mm)