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| Hydrography | |
|---|---|
| Name | Hydrography |
| Field | Oceanography; Cartography; Geodesy |
| Related | Nautical chart; Bathymetry; Surveying |
Hydrography is the science and practice of measuring and describing the physical features of bodies of water and the adjacent land areas for the primary purpose of safe navigation, resource management, and environmental stewardship. It integrates measurements of water depth, tides, currents, seabed morphology, and coastal change to produce charts, databases, and models used by mariners, scientists, planners, and regulators. Practitioners work at the intersection of maritime safety, marine geoscience, and coastal engineering, collaborating with navies, research institutes, and international organizations.
Hydrography encompasses the systematic surveying of lakes, rivers, estuaries, seas, and oceans to determine submerged topography, navigational hazards, and dynamic properties such as tides and currents. Key institutions and authorities include the International Hydrographic Organization, national hydrographic offices like the United Kingdom Hydrographic Office, the United States National Oceanic and Atmospheric Administration, the Service hydrographique et océanographique de la Marine, and the Australian Hydrographic Service. Hydrographic outputs support stakeholders such as the International Maritime Organization, commercial shipping firms like Maersk, naval forces including the Royal Navy and the United States Navy, port authorities such as the Port of Rotterdam Authority, and coastal agencies like the National Ocean Service. Hydrography relates to allied fields and projects such as bathymetry, geodesy, remote sensing, the GEBCO compilation, and the Seabed 2030 initiative.
Early charting efforts were driven by exploration and trade during eras represented by figures and entities like Christopher Columbus, the Vasco da Gama voyages, the East India Company, and the Dutch East India Company. Systematic national efforts emerged with organizations such as the British Admiralty Hydrographic Office and the formation of the International Hydrographic Organization after the Second World War. Technological milestones include the adoption of lead-line sounding by mariners in the age of sail, the development of echo sounding by inventors and manufacturers linked to firms such as Decca Navigator Company and engineers in Germany and United States naval research laboratories, and the proliferation of satellite altimetry programs like TOPEX/Poseidon, Jason-1, and Sentinel-6 Michael Freilich. Pioneering surveys by expeditions like the Challenger expedition influenced modern oceanography and charting; subsequent projects include multinational programs such as GEBCO and research by institutions like the Scripps Institution of Oceanography and the Woods Hole Oceanographic Institution.
Modern hydrographic surveying uses multibeam echosounders, single-beam echosounders, side-scan sonar, and interferometric sonars developed by companies and labs associated with Kongsberg Gruppen, Teledyne Technologies, and Fugro. Positioning relies on systems such as Global Positioning System, GLONASS, Galileo (satellite navigation), and augmentation systems including Differential GPS and Real Time Kinematic positioning. Tide and current measurements use instruments and networks maintained by agencies like the United States Geological Survey, the British Oceanographic Data Centre, and tide gauges coordinated under programs such as the Global Sea Level Observing System. Platforms include survey vessels operated by entities such as the Royal Netherlands Navy, unmanned surface vehicles developed by ASV Global, autonomous underwater vehicles used by MBARI, and airborne LiDAR systems developed with technology from firms like Leica Geosystems and research groups at the Jet Propulsion Laboratory. Data processing applies algorithms from the fields of geodesy and photogrammetry and software by vendors such as ESRI and open projects like QGIS.
Hydrographic information underpins nautical chart production by hydrographic offices serving commercial shipping lines like CMA CGM and regulatory agencies such as the International Maritime Organization. It supports offshore energy industries including companies like ExxonMobil and Shell for platform siting and pipelines, aids fisheries management overseen by organizations such as the Food and Agriculture Organization, and informs marine spatial planning initiatives in regions such as the European Union and the United States. Emergency response agencies including Coast Guard (United States Coast Guard) and disaster management bodies use hydrographic data in rescue and pollution response operations exemplified in events like the Exxon Valdez oil spill and the Deepwater Horizon oil spill. Hydrography contributes to scientific research at institutions like the National Oceanography Centre (UK), supports cable-laying firms such as SubCom, and assists archaeological surveys by museums and universities including the Smithsonian Institution.
Hydrographic surveys produce datasets such as sounding collections, digital terrain models, and electronic navigational charts (ENCs) conforming to standards set by the International Hydrographic Organization and organizations like the International Electrotechnical Commission. National and international data repositories include the GEBCO grid, the NOAA National Centers for Environmental Information, and port state databases maintained by authorities such as the Australian Hydrographic Service. Data formats and standards involve initiatives by ISO technical committees and interoperability frameworks used by software vendors like Fugro and research centers such as the Scott Polar Research Institute. Quality assurance and metadata practices draw on protocols from bodies like the Open Geospatial Consortium and the Committee on Data (CODATA).
Hydrographic activities operate within legal regimes including the United Nations Convention on the Law of the Sea and national statutes administered by ministries such as the Ministry of Defence (United Kingdom), the Department of Commerce (United States), and maritime administrations like the Maritime and Coastguard Agency (UK). International coordination involves the International Maritime Organization, the International Hydrographic Organization, and regional bodies like the European Maritime Safety Agency. Maritime boundary delimitation and seabed claims refer to institutions such as the Commission on the Limits of the Continental Shelf and cases before the International Tribunal for the Law of the Sea and the International Court of Justice.
Hydrographic science informs assessments of sea-level rise studied by research programs and observatories including Intergovernmental Panel on Climate Change, IPCC, National Aeronautics and Space Administration, European Space Agency, and projects like Sea Level Rise monitoring and Seabed 2030. Bathymetric and coastal change data support ecosystem mapping for habitats managed by organizations such as the World Wide Fund for Nature, UN Environment Programme, and projects by universities like University of Cambridge and University of Queensland. Hydrographic monitoring aids adaptation planning for coastal cities including New York City, Rotterdam, and Bangkok, and underpins environmental impact assessments required by frameworks such as the Espoo Convention and regional directives including the European Union Water Framework Directive.