Accession Number:

ADA288727

Title:

Atmospheric and Terrain Effects on Acoustic Propagation.

Descriptive Note:

Final rept.,

Corporate Author:

SALFORD UNIV (UNITED KINGDOM)

Personal Author(s):

• West, M.

Report Date:

1994-10-01

Pagination or Media Count:

14.0

Abstract:

Three computer models have been configured to give predictions under a range of atmospheric and terrain conditions which have allowed comparisons with measurements. A New Parabolic Equation PE model, HIPEDEM which uses the robust Crank Nicholson CN algorithm and which includes novel procedures for treating the ground and upper atmospheric boundaries has been developed together with a new turbulent atmosphere front end processor which can be coupled to the high atmosphere PE to give turbulent atmosphere predictions. A new generalised terrain PE model GT-PE has been developed which is capable of predictions over any smooth two dimensional terrain profile in the presence of a moving atmosphere. A feasibility study on the Split Step high speed PE has also been completed and a tutorial code for testing it has been written. Some interesting insights into the operational requirements of the Greens Function PE GF-PE have been gained.

Descriptors:

• *ATMOSPHERIC DISTURBANCES
• *TERRAIN
• *SOUND TRANSMISSION
• ALGORITHMS
• COMPUTERIZED SIMULATION
• REQUIREMENTS
• PREDICTIONS
• TURBULENCE
• CODING
• FEASIBILITY STUDIES
• BOUNDARY VALUE PROBLEMS
• SPLITTING
• GREENS FUNCTIONS

Subject Categories:

• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE