Turbidity - Wikipedia

Cloudiness of a fluid "Turbid" redirects here. For other uses, see Turbid (disambiguation).

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Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of both water clarity and water quality.

Fluids can contain suspended solid matter consisting of particles of many different sizes. While some suspended material will be large enough and heavy enough to settle rapidly to the bottom of the container if a liquid sample is left to stand (the settable solids), very small particles will settle only very slowly or not at all if the sample is regularly agitated or the particles are colloidal. These small solid particles cause the liquid to appear turbid.

Turbidity (or haze) is also applied to transparent solids such as glass or plastic. In plastic production, haze is defined as the percentage of light that is deflected more than 2.5° from the incoming light direction.[1]

Causes and effects

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Turbidity in open water may be caused by growth of phytoplankton. Human activities that disturb land, such as construction, mining and agriculture, can lead to high sediment levels entering water bodies during rain storms due to storm water runoff. Areas prone to high bank erosion rates as well as urbanized areas also contribute large amounts of turbidity to nearby waters, through stormwater pollution from paved surfaces such as roads, bridges, parking lots and airports.[2] Some industries such as quarrying, mining, and coal recovery can generate very high levels of turbidity from colloidal rock particles.

In drinking water, the higher the turbidity level, the higher the risk that people may develop gastrointestinal diseases.[3] This is especially problematic for immunocompromised people, because contaminants like viruses or bacteria can become attached to the suspended solids. The suspended solids interfere with water disinfection with chlorine[4] because the particles act as shields for viruses and bacteria. Similarly, suspended solids can protect bacteria from ultraviolet (UV) sterilization of water.[5]

In water bodies such as lakes, rivers and reservoirs, high turbidity levels can reduce the amount of light reaching lower depths, which can inhibit growth of submerged aquatic plants and consequently affect species which are dependent on them, such as fish and shellfish. High turbidity levels can also affect the ability of fish gills to absorb dissolved oxygen. This phenomenon has been regularly observed throughout the Chesapeake Bay in the eastern United States.[6][7]

For many mangrove areas, high turbidity is needed in order to support certain species, such as to protect juvenile fish from predators. For most mangroves along the eastern coast of Australia, in particular Moreton Bay, turbidity levels as high as 600 Nephelometric Turbidity Units (NTU) are needed for proper ecosystem health.[citation needed]

Measurement

[edit]

The measurement of turbidity is a key test of both water clarity and water quality.[citation needed] There are two standard units for reporting turbidity: Formazin Nephelometric Units (FNU) from ISO 7027 and Nephelometric Turbidity Units (NTU) from USEPA Method 180.1. ISO 7027 and FNU is mostly widely used in Europe, whereas NTU is mostly widely used in the U.S. ISO 7027 provides the method in water quality for the determination of turbidity. It is used to determine the concentration of suspended particles in a sample of water by measuring the incident light scattered at right angles from the sample. The scattered light is captured by a photodiode, which produces an electronic signal that is converted to a turbidity. Open source hardware has been developed following the ISO 7027 method to measure turbidity reliably using an Arduino microcontroller and inexpensive LEDs.[8]

There are several practical ways of checking water quality, the most direct being some measure of attenuation (that is, reduction in strength) of light as it passes through a sample column of water.[9] The alternatively used Jackson Candle method (units: Jackson Turbidity Unit or JTU) is essentially the inverse measure of the length of a column of water needed to completely obscure a candle flame viewed through it. The more water needed (the longer the water column), the clearer the water. Of course water alone produces some attenuation, and any substances dissolved in the water that produce color can attenuate some wavelengths. Modern instruments do not use candles, but this approach of attenuation of a light beam through a column of water should be calibrated and reported in JTUs.[9]

The propensity of particles to scatter a light beam focused on them is now considered a more meaningful measure of turbidity in water. Turbidity measured this way uses an instrument called a nephelometer with the detector set up to the side of the light beam. More light reaches the detector if there are many small particles scattering the source beam than if there are few. The units of turbidity from a calibrated nephelometer can be either NTU or FTU, depending on the standard method used. To some extent, how much light reflects for a given amount of particulates is dependent upon properties of the particles like their shape, color, and reflectivity. For this reason (and the reason that heavier particles settle quickly and do not contribute to a turbidity reading), a correlation between turbidity and total suspended solids (TSS) is somewhat unusual for each location or situation.[9]

Turbidity in lakes, reservoirs, channels, and the ocean can be measured using a Secchi disk. This black and white disk is lowered into the water until it can no longer be seen; the depth (Secchi depth) is then recorded as a measure of the transparency of the water (inversely related to turbidity). The Secchi disk has the advantages of integrating turbidity over depth (where variable turbidity layers are present), being quick and easy to use, and inexpensive. It can provide a rough indication of the depth of the euphotic zone with a 3-fold division of the Secchi depth, however this cannot be used in shallow waters where the disk can still be seen on the bottom.[10]

Cameras and computer vision have also been used to measured turbidity.[11] Such monitoring can make use of machine learning to identify problems in sewage.[12]

An additional device, which may help measuring turbidity in shallow waters is the turbidity tube.[13][10] The turbidity tube condenses water in a graded tube which allows determination of turbidity based on a contrast disk in its bottom, being analogous to the Secchi disk.

Turbidity in air, which causes solar attenuation, is used as a measure of pollution. To model the attenuation of beam irradiance, several turbidity parameters have been introduced, including the Linke turbidity factor (TL).[14][15]

Standards and test methods

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Drinking water standards

[edit]

Governments have set standards on the allowable turbidity in drinking water. In the United States, public water systems that use conventional or direct filtration methods must not have a turbidity higher than 1.0 NTU at the plant outlet and all samples for turbidity must be less than or equal to 0.3 NTU for at least 95 percent of the samples in any month. Systems that use filtration other than the conventional or direct filtration must follow state limits, which must include turbidity at no time exceeding 5 NTU. Many drinking water utilities strive to achieve levels as low as 0.1 NTU.[16] The European turbidity standard is 4 NTU.[17]

Ambient water standards

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United States

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The US Environmental Protection Agency (EPA) has published water quality criteria for turbidity.[18] These criteria are scientific assessments of the effects of turbidity, which are used by states to develop water quality standards for water bodies. (States may also publish their own criteria.) Some states have promulgated water quality standards for turbidity, including:

• Louisiana: 25, 50 or 150 NTU, or background plus 10 percent, depending on the water body.[19]
• Vermont: 10 NTU or 25 NTU, depending on water body classification.[20]
• Washington: 5 NTU over background (when background is 50 NTU or less), or 10 percent increase when background is over 50 NTU.[21]

Analytical methods

[edit]

Published analytical test methods for turbidity include:

• ISO 7027 "Water Quality: Determination of Turbidity"[22]
• US EPA Method No. 180.1, "Turbidity"[23]
• "Standard Methods", No. 2130B.[24]

Treatment

[edit]

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Turbidity is commonly treated using a settling or filtration process, or both settling and filtration. Depending on the application, flocculants may be dosed into the water stream to increase the effectiveness of the settling or filtration process.[25][26] Potable water treatment and municipal wastewater plants often remove turbidity with a combination of settling tanks, granular media filtration, and clarifiers.

In-situ water treatment or direct dosing for the treatment of turbidity is common when the affected water bodies are dispersed (i.e. there are numerous water bodies spread out over a geographical area, such as small drinking water reservoirs), when the problem is not consistent (i.e. when there is turbidity in a water body only during and after the wet season) or when a low cost solution is required. In-situ treatment of turbidity involves the addition of a reagent, generally a flocculant, evenly dispensed over the surface of the body of water. The flocs then settle at the bottom of the water body where they remain or are removed when the water body is drained. This method is commonly used at coal mines and coal loading facilities where stormwater collection ponds have seasonal issues with turbidity. A number of companies offer portable treatment systems for in-situ water treatment or direct dosing of reagents.

Reagents

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There are a number of chemical reagents that are available for treating turbidity, including aluminium sulfate or alum (Al2(SO4)3·nH2O), ferric chloride (FeCl3), gypsum (CaSO4·2H2O), poly-aluminum chloride, long chain acrylamide-based polymers and numerous proprietary reagents.[27] The water chemistry must be carefully considered when chemical dosing as some reagents, such as alum, will alter the pH of the water.

The dosing process must also be considered when using reagents as the flocs may be broken apart by excessive mixing.

See also

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• McFarland standards – Scale for turbidity measurement - reference for microbiological analysis
• Ocean optics
• Transparency and translucency – Property of an object or substance to transmit light with minimal scattering

References

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1. ^ Thermallaminatingfilms.com. Haze technical definition Archived August 22, 2015, at the Wayback Machine
2. ^ National Management Measures to Control Nonpoint Source Pollution from Urban Areas (Report). Washington, D.C.: U.S. Environmental Protection Agency (EPA). November 2005. EPA 841-B-05-004. Chapters 7-8.
3. ^ Mann, A.G.; Tam, C.C.; Higgins, C.D.; Lodrigues, L.L. (2007-09-21). "The association between drinking water turbidity and gastrointestinal illness: a systematic review". BMC Public Health. 7 (256). Springer Nature: 256. doi:10.1186/1471-2458-7-256. PMC 2174477. PMID 17888154.
4. ^ LeChevallier, M W; Evans, T M; Seidler, R J (July 1981). "Effect of turbidity on chlorination efficiency and bacterial persistence in drinking water". Applied and Environmental Microbiology. 42 (1): 159–167. Bibcode:1981ApEnM..42..159L. doi:10.1128/aem.42.1.159-167.1981. PMC 243978. PMID 7259162.
5. ^ Guidelines for Ultraviolet Disinfection of Drinking Water (PDF) (Report). Victoria, BC: British Columbia Ministry of Health. January 2022. pp. 6–7.
6. ^ Stevenson, J. Court; Piper, Catherine B.; Confer, Nedra (1979). "Decline of Submerged Plants in Chesapeake Bay". Annapolis, MD: U.S. Fish and Wildlife Service. Archived from the original on 2019-04-28.
7. ^ "Sediments". Annapolis, MD: Chesapeake Bay Program. 2009-08-06. Archived from the original on 2011-09-27.
8. ^ Wijnen, Bas; Anzalone, G.C.; Pearce, Joshua M. (2014-05-09). "Open-source mobile water quality testing platform". Journal of Water, Sanitation and Hygiene for Development. 4 (3). London: IWA Publishing: 532–537. Bibcode:2014JWSHD...4..532W. doi:10.2166/washdev.2014.137. S2CID 111183462.
9. ^ a b c "Measuring Turbidity, TSS, and Water Clarity". Fairborn, OH: Fondriest Environmental, Inc. Retrieved 1 February 2021.
10. ^ a b Myre, E, Shaw, R. The Turbidity Tube: Simple and Accurate Measurement of Turbidity in the Field. "The Turbidity Tube" Archived 2015-10-17 at the Wayback Machine
11. ^ Antonini, Giorgio; Pearce, Joshua M.; Berruti, Franco; Santoro, Domenico (2024-08-16). "A novel camera-based sensor for real-time wastewater quality monitoring". Water Practice and Technology. 19 (9): 3778–3793. Bibcode:2024WatPT..19.3778A. doi:10.2166/wpt.2024.211. ISSN 1751-231X.
12. ^ Ji, Hyon; Yoo, Sung; Lee, Bong-Jae; Koo, Dan; Kang, Jeong-Hee (2020-06-22). "Measurement of Wastewater Discharge in Sewer Pipes Using Image Analysis". Water. 12 (6): 1771. Bibcode:2020Water..12.1771J. doi:10.3390/w12061771. hdl:1805/27691. ISSN 2073-4441.
13. ^ Waterwatch Australia, Module 4 - physical and chemical parameters "Methods Turbidity"
14. ^ HelioClim (Center for Energy and Processes). Paris, France. "Linke Turbidity Factor." Archived 2011-07-23 at the Wayback Machine
15. ^ Kasten, F. (March 1996). "The linke turbidity factor based on improved values of the integral Rayleigh optical thickness". Solar Energy. 56 (3). Elsevier: 239–244. Bibcode:1996SoEn...56..239K. doi:10.1016/0038-092X(95)00114-7..
16. ^ "National Primary Drinking Water Regulations". EPA. 2022-01-26.
17. ^ "What are the drinking water standards?" (PDF). London: Drinking Water Inspectorate (UK). June 2017. Archived from the original (PDF) on 2020-11-11.
18. ^ Quality Criteria for Water (PDF) (Report). EPA. 1986. EPA 440/5-86-001. (Commonly known as the "Gold Book.").
19. ^ Louisiana Department of Environmental Quality. Baton Rouge, Louisiana."Surface Water Quality Standards." Louisiana Administrative Code (LAC). Title 33, Part IX, Chapter 11. August 6, 2007.
20. ^ Vermont Water Resources Board. Montpelier, Vermont. "Vermont Water Quality Standards." Archived 2013-12-31 at the Wayback Machine January 25, 2006.
21. ^ Washington Department of Ecology. Olympia, Washington."Water Quality Standards for Surface Waters of the State of Washington." Washington Administrative Code (WAC). Chapter 173-201A. November 18, 1997.
22. ^ International Organization for Standardization. Geneva, Switzerland. "ISO 7027-1:2016 Water quality – Determination of turbidity – Part 1: Quantitative Methods." 2016 and "ISO 7027-2:2019 Water quality – Determination of turbidity – Part 2: Semi-quantitative methods for the assessment of transparency of waters." 2019.
23. ^ EPA. Environmental Monitoring Systems Laboratory. Cincinnati, Ohio. "Method 180.1: Determination of Turbidity by Nephelometry; Revision 2.0." August 1993.
24. ^ Eaton, Andrew D.; Greenberg, Arnold E.; Rice, Eugene W.; Clesceri, Lenore S.; Franson, Mary Ann H., eds. (2005). Standard Methods For the Examination of Water and Wastewater (21 ed.). American Public Health Association. ISBN 978-0-87553-047-5. Also available on CD-ROM and online by subscription.
25. ^ Water Treatment, Grade 1. Denver, CO, USA: American Water Works Association. 2016.
26. ^ Darshan Singh Sarai (2006). Water Treatment Made Simple For Operators. John Wiley.
27. ^ Earth Systems, Clear Solutions newsletter - Focus on Turbidity [1] 2003.

External links

[edit] Look up turbidity in Wiktionary, the free dictionary.

• Water on the Web: "Turbidity" (University of Minnesota, Duluth and Lake Superior College)
• "Turbidity and Water" United States Geological Survey (USGS)
• USGS field manual on measuring turbidity
• Water Quality - Stormwater, Washington State
• Tubidy - Stormwater, Washington State

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Diving safety Human factors in diving equipment design Human factors in diving safety Life-support system Safety-critical system Scuba diving fatalities Underwater diving emergency Water safety Water surface searches Divinghazards List of diving hazards and precautions Environmental Current Delta-P Entanglement hazard Overhead Silt out Wave action Equipment Freeflow Use of breathing equipment in an underwater environment Failure of diving equipment other than breathing apparatus Single point of failure Physiological Cold shock response Decompression Nitrogen narcosis Oxygen toxicity Seasickness Uncontrolled decompression Diver behaviour and competence Incompetence Overconfidence effect Panic Task loading Trait anxiety Willful violation Consequences Barotrauma Decompression sickness Drowning Hypothermia Hypoxia Hypercapnia Hyperthermia Non-freezing cold injury Divingprocedures Ascending and descending Emergency ascent Boat diving Canoe and kayak diving Buddy diving buddy check Decompression Decompression practice Pyle stop Ratio decompression Dive briefing Dive log Dive planning Rule of thirds Scuba gas planning Diver communications Diver rescue Diver training Doing It Right Drift diving Gas blending for scuba diving Night diving Rebreather diving Scuba gas management Solo diving Wall diving Riskmanagement Checklist Hazard identification and risk assessment Hazard analysis Job safety analysis Risk assessment Hyperbaric evacuation and rescue Risk control Hierarchy of hazard controls Incident pit Lockout–tagout Permit To Work Redundancy Safety data sheet Situation awareness Diving team Bellman Chamber operator Diver medical technician Diver's attendant Diving supervisor Diving systems technician Gas man Life support technician Stand-by diver Equipmentsafety Breathing gas quality Testing and inspection of diving cylinders Hydrostatic test Sustained load cracking Diving regulator Breathing performance of regulators Occupationalsafety andhealth Association of Diving Contractors International International Marine Contractors Association Code of practice Contingency plan Diving regulations Emergency response plan Diving safety officer Diving superintendent Diving supervisor Operations manual Standard operating procedure
Diving medicine Divingdisorders List of signs and symptoms of diving disorders Cramp Motion sickness Surfer's ear Pressurerelated Alternobaric vertigo Barostriction Barotrauma Air embolism Aerosinusitis Barodontalgia Dental barotrauma Middle ear barotrauma Pulmonary barotrauma Compression arthralgia Decompression illness Dysbarism Oxygen Freediving blackout Hyperoxia Hypoxia Oxygen toxicity Inert gases Avascular necrosis Decompression sickness Dysbaric osteonecrosis Inner ear decompression sickness Isobaric counterdiffusion Taravana High-pressure nervous syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gascontaminants Carbon monoxide poisoning Immersionrelated Asphyxia Drowning Hypothermia Immersion diuresis Instinctive drowning response Laryngospasm Salt water aspiration syndrome Swimming-induced pulmonary edema Treatment Demand valve oxygen therapy First aid Hyperbaric medicine Hyperbaric treatment schedules In-water recompression Oxygen therapy Therapeutic recompression Personnel Diving Medical Examiner Diving Medical Practitioner Diving Medical Technician Hyperbaric nursing Screening Atrial septal defect Effects of drugs on fitness to dive Fitness to dive Psychological fitness to dive Research Researchers indiving physiologyand medicine Arthur J. Bachrach Albert R. Behnke Peter B. Bennett Paul Bert George F. Bond Robert Boyle Alf O. Brubakk Albert A. Bühlmann John R. Clarke Guybon Chesney Castell Damant Kenneth William Donald William Paul Fife John Scott Haldane Robert William Hamilton Jr. Henry Valence Hempleman Leonard Erskine Hill Brian Andrew Hills Felix Hoppe-Seyler Christian J. Lambertsen Simon Mitchell Charles Momsen Neal W. Pollock John Rawlins Charles Wesley Shilling Edward D. Thalmann Jacques Triger Diving medicalresearchorganisations Aerospace Medical Association Divers Alert Network (DAN) Diving Diseases Research Centre (DDRC) Diving Medical Advisory Council (DMAC) European Diving Technology Committee (EDTC) European Underwater and Baromedical Society (EUBS) National Board of Diving and Hyperbaric Medical Technology Naval Submarine Medical Research Laboratory Royal Australian Navy School of Underwater Medicine Rubicon Foundation South Pacific Underwater Medicine Society (SPUMS) Undersea and Hyperbaric Medical Society (UHMS) United States Navy Experimental Diving Unit (NEDU)
Law Civil liability in recreational diving Diving regulations Duty of care List of legislation regulating underwater diving Investigation of diving accidents Convention on the Protection of the Underwater Cultural Heritage
History of underwater diving History of decompression research and development History of dive computers History of Diving Museum History of scuba diving List of researchers in underwater diving Lyons Maritime Museum Man in the Sea Museum Timeline of atmospheric diving suits Timeline of diving technology Pearling in Western Australia US Navy decompression models and tables Archeologicalsites SS Commodore USS Monitor Queen Anne's Revenge Whydah Gally Underwater artand artists The Diver Jason deCaires Taylor Engineersand inventors Jerónimo de Ayanz y Beaumont William Beebe Georges Beuchat Giovanni Alfonso Borelli Joseph-Martin Cabirol John R. Clarke Jacques Cousteau Charles Anthony Deane John Deane Louis de Corlieu Auguste Denayrouze Ted Eldred Henry Fleuss Émile Gagnan Karl Heinrich Klingert Peter Kreeft Christian J. Lambertsen Yves Le Prieur John Lethbridge Ernest William Moir Joseph Salim Peress Auguste Piccard Joe Savoie Willard Franklyn Searle Gordon Smith Augustus Siebe Pierre-Marie Touboulic Jacques Triger Historicalequipment Aqua-Lung RV Calypso SP-350 Denise Magnesium torch Nikonos Porpoise regulator Standard diving dress Sub Marine Explorer Vintage scuba Diverpropulsionvehicles Advanced SEAL Delivery System Cosmos CE2F series Dry Combat Submersible Human torpedo Motorised Submersible Canoe Necker Nymph R-2 Mala-class swimmer delivery vehicle SEAL Delivery Vehicle Shallow Water Combat Submersible Siluro San Bartolomeo Welfreighter Wet Nellie Military andcovert operations Raid on Alexandria (1941) Sinking of the Rainbow Warrior Scientific projects 1992 cageless shark-diving expedition Mission 31 Awards and events Hans Hass Award International Scuba Diving Hall of Fame London Diving Chamber Dive Lectures NOGI Awards Women Divers Hall of Fame Incidents Dive boat incidents Sinking of MV Conception Diver rescues Alpazat cave rescue Tham Luang cave rescue Early diving John Day (carpenter) Charles Spalding Ebenezer Watson Freediving fatalities Stephen Keenan Loïc Leferme Audrey Mestre Nicholas Mevoli Natalia Molchanova Offshorediving incidents Byford Dolphin diving bell accident Drill Master diving accident Star Canopus diving accident Stena Seaspread diving accident Venture One diving accident Waage Drill II diving accident Wildrake diving accident Professionaldiving fatalities Roger Baldwin John Bennett Victor F. Guiel Jr. Francis P. Hammerberg Craig M. Hoffman Peter Henry Michael Holmes Johnson Sea Link accident Edwin Clayton Link Gerard Anthony Prangley Per Skipnes Robert John Smyth Albert D. Stover Richard A. Walker Lothar Michael Ward Joachim Wendler Bradley Westell Arne Zetterström Scuba divingfatalities 1973 Mount Gambier cave diving accident Ricardo Armbruster Allan Bridge David Bright Berry L. Cannon Cotton Coulson Cláudio Coutinho E. Yale Dawson Deon Dreyer Milan Dufek Sheck Exley Maurice Fargues Fernando Garfella Palmer Guy Garman Steve Irwin death Jim Jones Henry Way Kendall Artur Kozłowski Yuri Lipski Kirsty MacColl Agnes Milowka François de Roubaix Chris and Chrissy Rouse Dave Shaw Wesley C. Skiles Dewey Smith Rob Stewart Esbjörn Svensson Josef Velek
Publications Manuals NOAA Diving Manual U.S. Navy Diving Manual Basic Cave Diving: A Blueprint for Survival Underwater Handbook Bennett and Elliott's physiology and medicine of diving Encyclopedia of Recreational Diving The new science of skin and scuba diving Professional Diver's Handbook Basic Scuba Standards andCodes of Practice Code of Practice for Scientific Diving (UNESCO) DIN 7876 IMCA Code of Practice for Offshore Diving ISO 24801 Recreational diving services — Requirements for the training of recreational scuba divers General non-fiction The Darkness Beckons Goldfinder The Last Dive Shadow Divers The Silent World: A Story of Undersea Discovery and Adventure Research List of Divers Alert Network publications Dive guides
Training and registration Divertraining Competence and assessment Competency-based learning Refresher training Skill assessment Diver training standard Diving instructor Diving school Occupational diver training Commercial diver training Military diver training Public safety diver training Scientific diver training Recreational diver training Introductory diving ISO training standards Teaching method Muscle memory Overlearning Stress exposure training Skills Combat sidestroke Diver navigation Diver trim Ear clearing Frenzel maneuver Valsalva maneuver Finning techniques Scuba skills Buddy breathing Low impact diving Diamond Reef System Surface-supplied diving skills Underwater searches Recreationalscubacertificationlevels Core diving skills Advanced Open Water Diver Autonomous diver CMAS* scuba diver CMAS** scuba diver Introductory diving Low Impact Diver Master Scuba Diver Open Water Diver Supervised diver Leadership skills Dive leader Divemaster Diving instructor Master Instructor Specialist skills Rescue Diver Solo diver Diver trainingcertificationand registrationorganisations European Underwater Federation (EUF) International Diving Regulators and Certifiers Forum (IDRCF) International Diving Schools Association (IDSA) International Marine Contractors Association (IMCA) List of diver certification organizations National Oceanic and Atmospheric Administration (NOAA) Nautical Archaeology Society Recreational diver course referral World Recreational Scuba Training Council (WRSTC) Commercial divercertificationauthorities Australian Diver Accreditation Scheme (ADAS) Commercial diver registration in South Africa Divers Institute of Technology Health and Safety Executive (HSE) Department of Employment and Labour Commercial divingschools Divers Academy International Norwegian diver school Free-divingcertificationagencies AIDA International (AIDA) Confédération Mondiale des Activités Subaquatiques (CMAS) Performance Freediving International (PI) Scuba Schools International (SSI) Recreationalscubacertificationagencies American Canadian Underwater Certifications (ACUC) American Nitrox Divers International (ANDI) Association nationale des moniteurs de plongée (ANMP) British Sub-Aqua Club (BSAC) Comhairle Fo-Thuinn (CFT) Confédération Mondiale des Activités Subaquatiques (CMAS) Federación Española de Actividades Subacuáticas (FEDAS) Fédération Française d'Études et de Sports Sous-Marins (FFESSM) Federazione Italiana Attività Subacquee (FIAS) Global Underwater Explorers (GUE) International Association for Handicapped Divers (IAHD) International Association of Nitrox and Technical Divers (IANTD) International Life Saving Federation (ILS) Israeli Diving Federation (TIDF) National Academy of Scuba Educators (NASE) National Association of Underwater Instructors (NAUI) Nederlandse Onderwatersport Bond (NOB) Professional Association of Diving Instructors (PADI) Professional Diving Instructors Corporation (PDIC) Professional Technical and Recreational Diving (ProTec) Rebreather Association of International Divers (RAID) Sub-Aqua Association (SAA) Scuba Diving International (SDI) Scuba Educators International (SEI) Scuba Schools International (SSI) Türkiye Sualtı Sporları Federasyonu (TSSF) United Diving Instructors (UDI) YMCA SCUBA Program Scientific divercertificationauthorities American Academy of Underwater Sciences (AAUS) CMAS Scientific Committee Technical divercertificationagencies American Nitrox Divers International (ANDI) British Sub-Aqua Club (BSAC) Confédération Mondiale des Activités Subaquatiques (CMAS) Diving Science and Technology (DSAT) Federazione Italiana Attività Subacquee (FIAS) International Association of Nitrox and Technical Divers (IANTD) Professional Association of Diving Instructors (PADI) Professional Diving Instructors Corporation (PDIC) Professional Technical and Recreational Diving (ProTec) Rebreather Association of International Divers (RAID) Trimix Scuba Association (TSA) Cavediving Cave Divers Association of Australia (CDAA) Cave Diving Group (CDG) Global Underwater Explorers (GUE) National Speleological Society#Cave Diving Group (CDG) National Association of Underwater Instructors (NAUI) Technical Diving International (TDI) Military divertraining centres Defence Diving School Navy Diving Salvage and Training Center Underwater Escape Training Unit Military divertraining courses United States Marine Corps Combatant Diver Course
Underwater sports Surface snorkeling Finswimming Snorkeling/breath-hold Spearfishing Underwater football Underwater hockey Australia Turkey Underwater rugby Colombia United States Underwater target shooting Breath-hold Aquathlon Apnoea finswimming Freediving Open Circuit Scuba Immersion finswimming Sport diving Underwater cycling Underwater orienteering Underwater photography Rebreather Underwater photography Sports governingorganisations and federations International AIDA International Confédération Mondiale des Activités Subaquatiques) National AIDA Hellas Australian Underwater Federation British Freediving Association British Octopush Association British Underwater Sports Association Comhairle Fo-Thuinn Federación Española de Actividades Subacuáticas Fédération Française d'Études et de Sports Sous-Marins South African Underwater Sports Federation Türkiye Sualtı Sporları Federasyonu Underwater Society of America) Competitions 14th CMAS Underwater Photography World Championship Underwater Hockey World Championships Underwater Orienteering World Championships Underwater Rugby World Championships
Underwater divers Pioneersof diving Eduard Admetlla i Lázaro Aquanaut Mary Bonnin Amelia Behrens-Furniss James F. Cahill Jacques Cousteau Billy Deans Dottie Frazier Trevor Hampton Hans Hass Hannes Keller Dick Rutkowski Teseo Tesei Arne Zetterström Underwaterscientistsarchaeologists andenvironmentalists Michael Arbuthnot Robert Ballard George Bass Mensun Bound Louis Boutan Jeffrey Bozanic Hugh Bradner Cathy Church Eugenie Clark James P. Delgado Sylvia Earle John Christopher Fine George R. Fischer Anders Franzén Honor Frost Fernando Garfella Palmer David Gibbins Graham Jessop Swietenia Puspa Lestari Pilar Luna Robert F. Marx Anna Marguerite McCann Innes McCartney Charles T. Meide Mark M. Newell Lyuba Ognenova-Marinova John Peter Oleson Mendel L. Peterson Richard Pyle Andreas Rechnitzer William R. Royal Margaret Rule Gunter Schöbel Stephanie Schwabe Myriam Seco E. Lee Spence Robert Sténuit Peter Throckmorton Cristina Zenato Scuba recordholders Pascal Bernabé Jim Bowden Mark Ellyatt Sheck Exley Nuno Gomes Claudia Serpieri Krzysztof Starnawski Underwaterfilmmakersand presenters Samir Alhafith David Attenborough Ramón Bravo Jean-Michel Cousteau Richie Kohler Paul Rose Andy Torbet Ivan Tors Andrew Wight James Cameron Underwaterphotographers Doug Allan Tamara Benitez Georges Beuchat Adrian Biddle Jonathan Bird Eric Cheng Neville Coleman Jacques Cousteau John D. Craig Ben Cropp Bernard Delemotte David Doubilet Candice Farmer John Christopher Fine Rodney Fox Ric Frazier Stephen Frink Peter Gimbel Monty Halls Hans Hass Henry Way Kendall Rudie Kuiter Joseph B. MacInnis Luis Marden Agnes Milowka Noel Monkman Pete Oxford Steve Parish Zale Parry Pierre Petit Leni Riefenstahl Peter Scoones Brian Skerry Wesley C. Skiles E. Lee Spence Philippe Tailliez Ron Taylor Valerie Taylor Albert Tillman John Veltri Stan Waterman Michele Westmorland John Ernest Williamson J. Lamar Worzel Underwaterexplorers Caves Graham Balcombe Sheck Exley Martyn Farr Jochen Hasenmayer Jill Heinerth Jarrod Jablonski Brian Kakuk William Hogarth Main Tom Mount Jack Sheppard Bill Stone Reefs Arthur C. Clarke Wrecks Leigh Bishop John Chatterton Clive Cussler Bill Nagle Valerie van Heest Aristotelis Zervoudis Aquanauts Andrew Abercromby Joseph M. Acaba Clayton Anderson Richard R. Arnold Serena Auñón-Chancellor Michael Barratt (astronaut) Robert A. Barth Robert L. Behnken Randolph Bresnik Timothy J. Broderick Justin Brown Berry L. Cannon Scott Carpenter Gregory Chamitoff Steve Chappell Catherine Coleman Robin Cook Craig B. Cooper Fabien Cousteau Philippe Cousteau Timothy Creamer Jonathan Dory Pedro Duque Sylvia Earle Jeanette Epps Sheck Exley Albert Falco Andrew J. Feustel Michael Fincke Satoshi Furukawa Ronald J. Garan Jr. Michael L. Gernhardt Christopher E. Gerty David Gruber Chris Hadfield Jeremy Hansen José M. Hernández John Herrington Paul Hill Akihiko Hoshide Mark Hulsbeck Emma Hwang Norishige Kanai Les Kaufman Scott Kelly Karen Kohanowich Timothy Kopra Dominic Landucci Jon Lindbergh Kjell N. Lindgren Michael López-Alegría Joseph B. MacInnis Sandra Magnus Thomas Marshburn Matthias Maurer K. Megan McArthur Craig McKinley Jessica Meir Simone Melchior Dorothy Metcalf-Lindenburger Andreas Mogensen Karen Nyberg John D. Olivas Takuya Onishi Luca Parmitano Nicholas Patrick Tim Peake Thomas Pesquet Marc Reagan Garrett Reisman Kathleen Rubins Dick Rutkowski Tara Ruttley David Saint-Jacques Josef Schmid Robert Sheats Dewey Smith Steve Squyres Heidemarie Stefanyshyn-Piper Robert Sténuit Hervé Stevenin Nicole Stott James Talacek Daniel M. Tani Robert Thirsk Bill Todd Mark T. Vande Hei Koichi Wakata Rex J. Walheim Shannon Walker John Morgan Wells Joachim Wendler Douglas H. Wheelock Peggy Whitson Dafydd Williams Jeffrey Williams Sunita Williams Reid Wiseman Kimiya Yui Writers and journalists Michael C. Barnette Victor Berge Philippe Diolé Gary Gentile Bret Gilliam Bob Halstead Hillary Hauser Trevor Jackson Steve Lewis John Mattera Rescuers Craig Challen Richard Harris Rick Stanton John Volanthen Frogmen Lionel Crabb Ian Edward Fraser Sydney Knowles James Joseph Magennis Commercial salvors Keith Jessop
Science of underwater diving List of researchers in underwater diving Divingphysics Metre sea water Neutral buoyancy Underwater acoustics Modulated ultrasound Underwater vision Underwater computer vision Divingphysiology Blood shift Cold shock response Diving reflex Equivalent narcotic depth Maximum operating depth Physiological response to water immersion Thermal balance of the underwater diver Underwater vision Work of breathing Decompressiontheory Decompression models: Bühlmann decompression algorithm Haldane's decompression model Reduced gradient bubble model Thalmann algorithm Thermodynamic model of decompression Varying Permeability Model Equivalent air depth Oxygen window Physiology of decompression Divingenvironments Underwater exploration Deep-sea exploration Classification List of diving environments by type Altitude diving Benign water diving Confined water diving Deep diving Inland diving Inshore diving Muck diving Night diving Open-water diving Black-water diving Blue-water diving Penetration diving Cave diving Torricellian chamber Ice diving Wreck diving Recreational dive sites Underwater environment Underwater diving environment Impact Environmental impact of recreational diving Low impact diving
Other Bathysphere Defense against swimmer incursions Diver detection sonar Offshore survey Rugged compact camera Underwater domain awareness Underwater vehicle Deep-submergencevehicle Aluminaut DSV Alvin American submarine NR-1 Bathyscaphe Archimède FNRS-2 FNRS-3 Harmony class bathyscaphe Sea Pole-class bathyscaphe Trieste II Deepsea Challenger Ictineu 3 JAGO Jiaolong Konsul-class submersible Limiting Factor Russian submarine Losharik Mir Nautile Pisces-class deep submergence vehicle DSV Sea Cliff DSV Shinkai DSV Shinkai 2000 DSV Shinkai 6500 DSV Turtle DSV-5 Nemo Submarine rescue International Submarine Escape and Rescue Liaison Office Submarine Escape and Rescue system (Royal Swedish Navy) McCann Rescue Chamber Submarine rescue ship Deep-submergencerescue vehicle LR5 LR7 MSM-1 Mystic-class deep-submergence rescue vehicle DSRV-1 Mystic DSRV-2 Avalon NATO Submarine Rescue System Priz-class deep-submergence rescue vehicle Russian deep submergence rescue vehicle AS-28 Russian submarine AS-34 ASRV Remora SRV-300 Submarine Rescue Diving Recompression System Type 7103 DSRV URF (Swedish Navy) Submarine escape Escape trunk Submarine escape training facility Submarine Escape Training Facility (Australia) Escape set Davis Submerged Escape Apparatus Momsen lung Steinke hood Submarine Escape Immersion Equipment Specialinterestgroups Artificial Reef Society of British Columbia CMAS Europe Coral Reef Alliance Divers Alert Network Green Fins Finger Lakes Underwater Preserve Association Karst Underwater Research Nautical Archaeology Program Nautical Archaeology Society Naval Air Command Sub Aqua Club PADI AWARE Reef Check Reef Life Survey Rubicon Foundation Save Ontario Shipwrecks SeaKeys Sea Research Society Society for Underwater Historical Research Society for Underwater Technology Underwater Archaeology Branch, Naval History & Heritage Command Neutral buoyancyfacilities forAstronaut training Neutral Buoyancy Laboratory Neutral buoyancy pool Neutral buoyancy simulation as a training aid Neutral Buoyancy Simulator Space Systems Laboratory Yuri Gagarin Cosmonaut Training Center Other Nautilus Productions Helicopter Aircrew Breathing Device Scuba diving therapy Seabed mining
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