Ocean currents data as part of Ordnance Reef Transport Study collected by ADCP from Ordnance Reef area of Oahu, Hawaii from 2010-01-17 to 2010-08-23 (NCEI Accession 0079514)
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title: Ocean currents data as part of Ordnance Reef Transport Study collected by ADCP from Ordnance Reef area of Oahu, Hawaii from 2010-01-17 to 2010-08-23 (NCEI Accession 0079514)
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abstract: Four high-precision sensor arrays at a conventional munitions disposal site off Waianae known locally as "Ordnance Reef" and one sensor array at a deep-water chemical munitions disposal site approximately 32 miles from Honolulu were deployed. In addition to providing data needed to determine where Pacific Ocean currents might carry munitions materials in the event of a release, the sensors help NOAA and University of Hawaii scientists study how munitions might be affected by the marine environment. The data are also used in an integrated observing and prediction system that monitors ocean circulation, water quality, and biological productivity off Oahu's south shore.
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supplementalInformation: Please go to these websites for additional information: http://ordnancereefhawaii.org/default.htm http://www.noaanews.noaa.gov/stories2009/20090721_hawaiicurrents.html
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description: Acoustic Doppler Current Profiler The Acoustic Doppler Current Profiler (ADCP) measures currents beneath a ship while underway. Sound signals sent from the moving ship bounce back to receivers aboard the ship. This provides a profile of water movement relative to the ship-precise modern navigation, allowing the ship's motion to be subtracted from the data. These devices are also used on moorings and profilers and, along with acoustic backscattering, measure animal biomass. Particles in the path of the sound waves, mostly plankton, reflect a small part of the sound energy back toward receivers, allowing researchers to make remote estimates of the sizes and numbers of animals present in the water column. Before the 1970's, the most technologically advanced instrument used to measure water velocity was known as a Doppler speed log. This evolved into the first commercial ADCP, produced in the mid-1970's, which used averaging. Later in the 1970's, the first vessel-mounted ADCP was developed to measure water velocity more accurately and to allow measurement in range cells over a depth profile. As instruments evolved, so did new techniques in Doppler signal processing. Initially, Doppler speed logs used simple analog signal processing methods, which are still used in some commercial speed logs today. However, the first ADCPs incorporated analog-to-digital signal conversion over a narrow communication bandwidth. Around 1990, this technique was developed into broadband signal processing. Since then, broadband ADCPs have been able to generate very accurate, real-time velocity measurements.