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Record 37 of 10343
Evidence for self-refraction in a convergence zone: NPE (Nonlinear progressive wave equation) model results
Availability: Go to Request Form
Author and Affiliation:
Mcdonald, B. Edward(Jet Propulsion Lab., California Inst. of Tech., Pasadena., United States)
Plante, Daniel R.(Berkeley Research Association, Springfield, VA., United States)
Abstract: The nonlinear progressive wave equation (NPE) model was developed by the Naval Ocean Research and Development Activity during 1982 to 1987 to study nonlinear effects in long range oceanic propagation of finite amplitude acoustic waves, including weak shocks. The NPE model was applied to propagation of a generic shock wave (initial condition provided by Sandia Division 1533) in a few illustrative environments. The following consequences of nonlinearity are seen by comparing linear and nonlinear NPE results: (1) a decrease in shock strength versus range (a well-known result of entropy increases at the shock front); (2) an increase in the convergence zone range; and (3) a vertical meandering of the energy path about the corresponding linear ray path. Items (2) and (3) are manifestations of self-refraction.
Publication Date: Aug 01, 1989
Document ID:
19900013563
(Acquired Nov 06, 1995)
Accession Number: 90N22879
Subject Category: OCEANOGRAPHY
Report/Patent Number: AD-A218546, NORDA-223
Document Type: Technical Report
Publisher Information: United States
Financial Sponsor: Department of Energy; United States
Organization Source: Naval Ocean Research and Development Activity; Bay Saint Louis, MS, United States
Description: 15p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: ACOUSTIC ATTENUATION; MATHEMATICAL MODELS; NONLINEAR EQUATIONS; REFRACTED WAVES; SHOCK WAVE PROPAGATION; WAVE EQUATIONS; AMPLITUDES; ENTROPY; OCEANS; SHOCK LOADS; SOUND WAVES; VERTICAL ORIENTATION
Miscellaneous Notes: Sponsored in part by Sandia National Lab.
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