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| Hydrology | |
|---|---|
| Name | Hydrology |
| Field | Earth science |
| Related | Hydrogeology, Meteorology, Climatology |
Hydrology Hydrology is the scientific study of the occurrence, distribution, movement, and properties of water on and beneath the surface of the Earth and on other planetary bodies. It integrates observational, theoretical, and applied approaches to understand interactions among rivers, lakes, soils, aquifers, glaciers, and the atmosphere. Researchers and practitioners collaborate across institutions such as the United Nations Educational, Scientific and Cultural Organization, World Meteorological Organization, US Geological Survey, European Commission agencies, and universities like Massachusetts Institute of Technology, University of Cambridge, and Stanford University.
Hydrology draws on concepts from Isaac Newton-era mechanics through modern contributions from James Hutton-inspired earth sciences and twentieth-century advances at institutions such as Imperial College London, ETH Zurich, and California Institute of Technology. Key historical developments include instrumentation improvements linked to Royal Society patronage and watershed studies influenced by projects like the Hoover Dam and the Three Gorges Dam. Prominent centers for hydrological research include National Oceanic and Atmospheric Administration, British Geological Survey, and the International Hydrological Programme. Major awards and forums that shape the field include the Prince Sultan Bin Abdulaziz International Prize for Water, the International Association of Hydrological Sciences symposia, and journals affiliated with American Geophysical Union and Royal Society Publishing.
The hydrologic cycle describes fluxes and storages of water involving the Sun-driven energy budget, evapotranspiration from ecosystems such as the Amazon Rainforest and the Sahara Desert margins, precipitation regimes over regions like Monsoon Asia and North America, surface runoff as observed in the Mississippi River and Nile River, infiltration to aquifers beneath the Great Artesian Basin, and discharge to oceans including the Pacific Ocean and Atlantic Ocean. Climate oscillations such as the El Niño–Southern Oscillation and the North Atlantic Oscillation modulate cycle components, while glaciological processes in places like Greenland and Antarctica affect long-term storage. Human interventions exemplified by the Aral Sea diversion and Colorado River Compact allocations alter natural cycling and water budgets.
Surface water hydrology examines channel flow dynamics in systems like the Amazon River Basin, Yangtze River, and Danube River and floodplain processes seen during events such as Hurricane Katrina and the Great Mississippi Flood of 1927. It encompasses routing methods used in reservoir operations at Aswan High Dam and sediment transport studies at sites like the Ganges Delta. Engineering responses include designs following standards from organizations like American Society of Civil Engineers and flood risk modeling applied in cities such as Venice and New Orleans. Riparian ecology studies often reference protected areas like Yellowstone National Park and programs run by United States Fish and Wildlife Service.
Groundwater hydrology focuses on aquifer characterization in formations such as the Ogallala Aquifer, karst systems in the Mammoth Cave National Park area, and confined aquifers underlying the Guarani Aquifer. Techniques for assessing recharge and drawdown inform management of transboundary resources described in agreements like the Indus Waters Treaty and projects by the World Bank. Contaminant transport research references case studies at Love Canal and remediation efforts guided by regulations in frameworks like the Clean Water Act. Institutions such as the Geological Society of America and laboratories at Los Alamos National Laboratory contribute to hydrogeological modeling and isotope-tracing studies.
Watershed science analyzes land-use impacts in basins from the Loess Plateau to the Colorado River Basin and urban hydrology challenges in metropolitan areas such as Tokyo and São Paulo. Soil-vegetation-atmosphere interactions are studied in field sites like the LTER network and experimental catchments managed by USDA Forest Service and CNR research groups. Tools for landscape-scale assessment include remote sensing from satellites like Landsat, Sentinel-2, and missions by National Aeronautics and Space Administration working with European Space Agency programs.
Hydrometeorology connects atmospheric processes monitored by observatories such as Mauna Loa Observatory and the European Centre for Medium-Range Weather Forecasts with hydrological responses in watersheds affected by phenomena like Tropical Cyclones and Atmospheric River events. Research integrates outputs from climate models developed by groups at IPCC assessments and regional downscaling performed by centers including Met Office and CSIRO. Extreme event attribution studies leverage collaborations among NOAA, NASA, and university consortia.
Applied hydrology underpins water resources planning in frameworks like the Sustainable Development Goals, irrigation systems in regions governed by authorities such as the Bureau of Reclamation, urban stormwater design following guidelines from EPA, and transboundary water diplomacy exemplified by the Nile Basin Initiative. Disaster risk reduction draws on practices refined after events like the 2011 Tōhoku earthquake and tsunami and floodplain zoning used in the Netherlands with engineering by firms collaborating with Deltares.
Methods span field instrumentation such as stream gauging networks maintained by USGS and piezometer installations used by British Geological Survey, remote sensing from platforms like MODIS and GRACE, numerical modeling with software developed at Princeton University and ETH Zurich, and statistical approaches promoted by societies like the Royal Statistical Society. Tracer hydrology uses isotopic analysis from laboratories associated with Scripps Institution of Oceanography and Max Planck Institute groups, while citizen science initiatives partner with organizations such as Global Water Watch and World Wildlife Fund for distributed monitoring.