Acoustical Technology for the Study of Marine Organisms [report]

D. V. Holliday, C. F. Greenlaw, D. E. McGehee
2000 unpublished
ONR Contract N00014-98-C-0025 http://www.aard.tracor.com LONG-TERM GOAL The long-term goal of our research is to improve our ability to observe the ocean's plants, animals and their physical and chemical environment at the critical scales which control how they live, reproduce and die. OBJECTIVES Chronic undersampling of the marine environment, including both biological and physical components, has been and remains a major block to understanding how marine ecosystems function and how they
more » ... d to changes, whether natural or anthropogenic. Consequently, data-based models that accurately predict local variations in the abundance of plant and animal life in the sea are rare or do not exist at all. Such models would be invaluable in predicting variables such as acoustical and optical scattering in areas of tactical interest to the Navy. Our research directly addresses the root of this problem by attempting to advance acoustical technology as an aid in measuring spatio-temporal distributions of a variety of marine organisms in relation to the physio-chemical ocean environment. APPROACH Our research has multiple focus areas which are currently addressing: 1) advancing high-resolution multi-frequency acoustical technology for detecting and observing small zooplankton, micronekton and fish in time and space; 2) the development of a new multi-frequency, multi-static measurement concept, including some fundamental theoretical approaches to aid in remote detection and classification --with the ultimate long-range objective of remote identification of small organisms in the sea; and, 3) support of other principal investigators in the use of our acoustical zooplankton sensors to carry out several science programs --in the immediate past, most notably the critical scales program focused on thin layers. High-resolution (time and space) multi-frequency acoustical technology: Over the last five years, for shallow water environments, we have improved the space-time resolution of in-situ observations of small zooplankton by nearly 3 orders of magnitude Holliday 1999) . Multifrequency acoustics is now a proven tool for studying the distributions and dynamics of zooplankton Report Documentation Page Form Approved OMB No. 0704-0188 Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.
doi:10.21236/ada609856 fatcat:ussbb6xnr5enfheid24gj756bu