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Hydroacoustics is a general term for the study and application of sound in water. The term comes from Greek υδρο, water, and ακουστική, acoustics. Hydroacoustics, utilizing SONAR technology, is most commonly used for detection, assessment, and monitoring of underwater physical and biological characteristics. Hydroacoustics can be utilized to detect the depth of a water body (bathymetry), as well as the presence or absence, abundance, distribution, size, and behavior of underwater plants and animals. Hydroacoustic sensing involves "passive acoustics" (listening for sounds) or active acoustics making a sound and listening for the echo, hence the common name for the device, echo sounder or echosounder. Specific Applications Surveillance Towed Array Sensor System Fisheries Acoustics Acoustic Doppler Current Profiler for water speed measurement Acoustic Camera Passive Acoustic Monitoring Related Publications Quality assurance of hydroacoustic surveys: the repeatability of fish-abundance and biomass estimates in lakes within and between hydroacoustic systems (free link to document) Hydroacoustics as a tool for assessing fish biomass and size distribution associated with discrete shallow water estuarine habitats in Louisiana Acoustic assessment of squid stocks Summary of the use of hydroacoustics for quantifying the escapement of adult salmonids (Oncorhynchus and Salmo spp.) in rivers. Ransom, B.H., S.V. Johnston, and T.W. Steig. 1998. Presented at International Symposium and Workshop on Management and Ecology of River Fisheries, University of Hull, England, 30 March-3 April 1998 Multi-frequency acoustic assessment of fisheries and plankton resources. Torkelson,T.C., T.C. Austin, and P.H. Weibe. 1998. Presented at the 135th Meeting of the Acoustical Society of America and the 16th Meeting of the International Congress of Acoustics, Seattle, Washington. References Acoustics Unpacked A great reference for freshwater hydroacoustics for resource assessment Inter-Calibration of Scientific Echosounders in the Great Lakes Hydroacoustic Evaluation of Spawning Red Hind Aggregations Along the Coast of Puerto Rico in 2002 and 2003 Feasibility Assessment of Split-Beam Hydroacoustic Techniques for Monitoring Adult Shortnose Sturgeon in the Delaware River Categorising Salmon Migration Behaviour Using Characteristics of Split-beam Acoustic Data Evaluation of Methods to Estimate Lake Herring Spawner Abundance in Lake Superior Estimating Sockeye Salmon Smolt Flux and Abundance with Side-Looking Sonar Herring Research: Using Acoustics to Count Fish. Hydroacoustic Applications in Lake, River and Marine environments for study of plankton, fish, vegetation, substrate or seabed classification, and bathymetry. Hydroacoustics: Rivers (in: Salmonid Field Protocols Handbook: Chapter 4) Hydroacoustics: Lakes and Reservoirs (in: Salmonid Field Protocols Handbook: Chapter 5) PAMGUARD: An Open-Source Software Community Developing Marine Mammal Acoustic Detection and Localisation Software to Benefit the Marine Environment; http://www.pamguard.org/home.shtml v · d · eHydroacoustics Sonar Acoustic Doppler Current Profiler · Baffles (submarine) · Bistatic sonar · Echo sounding · GLORIA sidescan sonar · Scientific Echosounder · Side-scan sonar · Sonar 2087 · Sonar beamforming · Sonobuoy · Surveillance Towed Array Sensor System · Synthetic aperture sonar · Towed array sonar · Upward looking sonar Ocean acoustics Ocean acoustic tomography · Sofar bomb · SOFAR channel · Underwater acoustics Acoustic ecology Acoustic tag · Animal echolocation · Beached whale · Bioacoustics · Biophony · Fishfinder · Fisheries acoustics · Marine mammals and sonar · Noise map · Soundscape · Whale song  Physical oceanography - Waves and Currents Waves Airy wave theory · Ballantine Scale · Boussinesq approximation · Breaking wave · Clapotis · Cnoidal wave · Cross sea · Dispersion · Infragravity waves · Edge wave · Equatorial waves · Fetch · Freak wave · Gravity wave · Internal wave · Kelvin wave · Luke's variational principle · Mild-slope equation · Radiation stress · Rogue wave · Rossby wave · Rossby-gravity waves · Sea state · Seiche · Significant wave height · Sneaker wave · Soliton · Stokes drift · Surf wave · Swells · Tsunami · Undertow · Ursell number · Wave base · Wave–current interaction · Wave height · Wave power · Wave shoaling · Wave radar · Wave turbulence · Waves and shallow water · Shallow water equations · Wind wave · Wind wave model · More... Circulation Atmospheric circulation · Baroclinity · Boundary current · Coriolis effect · Downwelling · Eddy · Ekman layer · Ekman spiral · Ekman transport · El Niño-Southern Oscillation · Geostrophic current · Gulf Stream · Halothermal circulation · Humboldt Current · Hydrothermal circulation · Global circulation model · Langmuir circulation · Longshore drift · Loop Current · Maelstrom · Ocean current · Ocean dynamics · Ocean gyre · Rip current · Thermohaline circulation · Shutdown of thermohaline circulation · Subsurface currents · Sverdrup balance · Whirlpool · Upwelling · GLODAP · MOM · POM · WOCE · More... Tides Amphidromic point · Earth tide · Head of tide · Internal tide · Lunitidal interval · Perigean spring tide · Rule of twelfths · Slack water · Spring/neap tide · Tidal bore · Tidal force · Tidal power · Tidal race · Tidal range · Tidal resonance · Tide · Tide gauge · Tideline · More...  Physical oceanography - Other Landforms Abyssal fan · Abyssal plain · Atoll · Bathymetric chart · Cold seep · Continental margin · Continental rise · Continental shelf · Contourite · Hydrography · Guyot · Oceanic basin · Oceanic plateau · Oceanic trench · Passive margin · Seabed · Seamount · Submarine canyon · Coastal geography · More... Plate tectonics Black smoker · Convergent boundary · Divergent boundary · Fracture zone · Hydrothermal vent · Marine geology · Mid-ocean ridge · Mohorovičić discontinuity · Vine–Matthews–Morley hypothesis · Oceanic crust · Outer trench swell · Ridge push force · Seafloor spreading · Slab pull force · Slab suction force · Slab window · Subduction · Transform fault · Volcanic arc · More... Ocean zones Benthic · Deep ocean water · Deep sea · Littoral · Mesopelagic · Oceanic zone · Pelagic · Photic · Surf zone Sea level Current sea level rise · Future sea level · Sea-level curve · DART · GLOSS · NOOS · OSTM · WGS Acoustics Ocean acoustic tomography · Sofar bomb · SOFAR channel · Underwater acoustics · Hydroacoustics Other Alvin · Argo · Benthic lander · Color of water · Marginal sea · Mooring · Ocean · Ocean energy · Ocean exploration · Ocean observations · Ocean pollution · Ocean reanalysis · Ocean surface topography · Ocean thermal energy conversion · Oceanography · Pelagic sediments · Sea surface microlayer · Sea surface temperature · Seawater · Science On a Sphere · Thermocline · Underwater glider · Water column · World Ocean Atlas · NODC · More...