Characterization of Lower Atmospheric Boundary Layer to Support Acoustic Propagation Model Validation
Abstract
This DURIP funding will expand the PI s capabilities for the study of sound propagation in air as it relates to the near-shore det ection of Naval platforms. The ultimate aim of the research is development and validation of a mathematical model of acoustic detect ability given current atmospheric and water surface conditions. There is a critical need for data sets with high spatial and tempora l resolution that include measurements of both acoustic transmission loss and concurrent meteorological conditions in the lower atmo spheric boundary layer. These data sets will allow comparison of various existing acoustic propagation modeling approaches being con sidered for adoption as well as further numerical model development. Specifically, the PI has been involved in both modeling and m easurement of acoustic propagation over distances ranging from hundreds of meters to several kilometers over ranges that include bot h water and shore components. The measurement equipment requested in this proposal represents a substantial improvement in both the resolution and quality of the atmospheric measurements and a modest improvement in the Pl s existing transmission loss measurement system by duplicating the acoustic channel count of the current system. The proposal includes a comprehensive collection of acousti c and atmospheric sensors that will function as a single highly-configurable system. The specific equipment requested includes a se t of three seven-channel GPS-synchronized acoustic measurement modules that can be configured in a variety of geometries up to a 10 meter mast height. These three modules are identical to three modules already in use by the Pl. One mast will also be instrumented with humidity sensors for high spatial resolution characterization of humidity changes in the near-surface near-shore boundary laye r. A ground based LIDAR will enable mapping of the vertical wind speed profile. Taken together, the system is a 42-channel distribut ed acoustic array that will allow for detailed mapping of moderate range acoustic propagation and concurrent atmospheric conditions in a variety of weather conditions. The system will not only serve in a research function for the current ONR efforts, but also wi ll be the basis for graduate and advanced undergraduate-level elective courses in experimental methods and resource for students wh o desire an independent study opportunity. The PI s commitment to involving undergraduate students in meaningful research endeavors prepares them for success in graduate study or professional practice in many DoD related paths.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Oct 22, 2021
- Source ID
- N000142112930
Entities
People
- Teresa Ryan
Organizations
- East Carolina University
- Office of Naval Research
- United States Navy