Ocean Bottom Reflectivity (A Point of View).
Abstract
The analysis procedures for extracting bottom loss values from pulsed-acoustic signals that have interacted only with the ocean bottom do not inherently consider sub-bottom refraction and reflection of sound, which are important effects at low frequencies (i.e., <500 Hz). Sound returning from the sub-bottom can constructively interact with sound reflected from the water-sediment interface, yielding 'negative bottom loss' results. To support this premise a Fast Field Program (FFP) time domain model simulation of a bottom loss measurement was performed in which the lateral wave was the only additional arrival interacting with the bottom-reflected wave arrival. The simulation demonstrated a plausible cause for negative bottom loss results and demonstrates that propagation models must accommodate the environmental description of both the water column and ocean bottom.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 20, 1975
- Accession Number
- ADA019159
Entities
People
- Frederick R. Dinapoli
- Salvatore R. Santaniello
Organizations
- Naval Underwater Systems Center