Cette note technique présente certains aspects techniques du RS5 et met en lumière ses capacités sur le terrain en montrant des comparaisons de données utilisant d'autres systèmes ADCP sur une grande variété de sites différents. Les données présentées dans cette note technique ont été utilisées pour le développement des algorithmes acoustiques du RS5 et pour optimiser les performances des mesures de débit à faible profondeur.
Carbon dioxide levels in the atmosphere have increased by about one-third since the start of the Industrial Revolution, from about 300 parts per million (ppm) to about 400 ppm. About one-third of the atmosphere's carbon dioxide dissolves into the ocean. As dissolved carbon dioxide levels have increased, the earth's seawater has become about 30 percent more acidic. "Like many green plants, eelgrass grows faster as carbon dioxide levels increase," notes California Sea Grant Extension ecologist Joe Tyburczy at Humboldt State University in Eureka, California. "But unlike green plants that grow on land, eelgrass takes up CO2 directly from the seawater."
Monostatic acoustic transducers used on acoustic Doppler current profilers (ADPs or ADCPs) are used in pairs and groups to resolve multi-directional water velocity and sometimes track position. It is critical that the acoustic signal from these groups of beams show the same acoustic decay at the same decibel (dB) level. Beam separation is defined by the difference in dB among the beams, if any one beam differs by more than 10 dB, this beam is considered to be separated from the others.
The new FlowTracker2 (FT2) handheld Acoustic Doppler Velocimeter (ADV®) has all the technology you have grown to know and trust with the original FlowTracker, but now comes with functional, modernized features (Bluetooth, GPS and large color screen, to name only a few) based on the evaluation and feedback from hydrologists, researchers and scientists who have made the FlowTracker their instrument of choice.