Wave and Surf Noise Measurements: Supplementation


Investigators

Ellen Livingston, Steve Wolf, Bruce Pasewark

Funding Source

Naval Research Laboratory, Washington, D.C.

Objectives

The NRL Surf Noise Measurement Supplementation experiment is a supplement to the Wave and Surf Generated Ambient Noise Measurements experiment (DUCK94 Exp. #23) supported by the NRL Undersea Noise Program. This experiment is intended to measure aspects of surf zone noise generation and propagation during a time when concurrent measurements of the ambient environmental processes are being measured in the DUCK94 experiment. The Surf Supplement experiment will increase the duration, reliability and safety of the currently planned sonobuoy noise collection processes, and augment those measurements with directional noise measurements on an acoustic array, measurements from a controlled source for understanding the propagation characteristics of the waveguide, and measurements of air and wet sand propagating surf noise.

Approach

The original plan for the Wave and Surf Generated Ambient Noise Measurements Experiment calls for several deployments of four DIFAR sonobuoys at ranges from 1 to 10 km from shore. The deployments will be made before storms or high wave events and data will be transmitted for eight hours on standard sonobuoy RF frequencies (EFS Channels 1-99) in the 136-173 MHz band. Deployments will be made by leased commercial vessel in positions away from other sensors to avoid physical interference. We will augment these measurements as follows:

All data will be analyzed in conjunction with wave and surf measurements from other experiments to develop and improve theoretic nearshore acoustic noise models.

For a list of addresses of the investigators involved in Duck 94 click here.