USGS: Science Topics: hydrology

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Hydrology

Branch of earth science that deals with water as it occurs in the atmosphere, on the surface of the ground, and underground.

Subtopics:
Hydrodynamics (3 items)

Hydrologic maps (28 items)

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Decadal-scale changes in dissolved-solids concentrations in groundwater used for public supply [More info]: Recent increases in dissolved-solids concentrations in this aquifer have been documented in some areas used for public supply, raising concerns as to the sources and causes of the higher concentrations and the long-term effects on groundwater quality.
Demonstrating usefulness of real-time monitoring at streambank wells coupled with active streamgages - Pilot studies in Wyoming, Montana, and Mississippi [More info]: To better understand the exchange of groundwater and surface water, we coupled groundwater monitoring at the stream bank with nearby gages in the stream. Describes the procedure and results from several areas.
Development of computational fluid dynamics--habitat suitability (CFD-HSI) models to identify potential passage--Challenge zones for migratory fishes in the Penobscot River [More info]: Proposed removal of dams will change the characteristics of stream flow and will affect fish that swim upstream to spawn. A mathematical model of the river flow tells us where the likely problems will be located and how the flow will change.
Discontinuous nature of kriging digital terrain models [More info]: Research exploring the mathematical properties of kriging, a widely-used surface interpolation method. The continuity properties of kriging digital terrain models over a wide range of terrain types helps hydrologists assess the usefulness of kriging for D
Drought and deluge: Effects of recent climate variability on groundwater levels in eastern Arkansas [More info]: Water levels in wells completed in the Mississippi River Valley alluvial aquifer and the Sparta aquifer in eastern Arkansas respond to variability associated with annual precipitation.
Drought watch - USGS state information on drought [More info]: Map display that highlights states where the streamflow index at USGS streamgages, averaged statewide, were below normal for the past seven days with links to comparison of recent streamflow values with historic values.
Drought watch Pacific Northwest states: Washington, Oregon, Idaho [More info]: Drought water homepage with links to maps showing streamflow conditions, drought definitions, resources, publications, and answers to Frequently Asked Questions (FAQs).
Duration and current conditions graphs for selected Pennsylvania sites [More info]: Plots of streamflow averages and ground water depths for selected hydrologic sites in Pennsylvania.
Ecological National Synthesis Project [More info]: National-scale perspective and assessments on aquatic ecology, and the chemical and physical factors that affect aquatic conditions and health.
Effects of climate change and land use on water resources in the Upper Colorado River Basin [More info]: Information from climate model forecasts, projections of future flows, paleoclimatic indicators, timing of snowmelt, airborne dust, and the effects on vegetation of troublesome pest species indicate the nature and severity of problems looming.

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