wunder beta📘 How do coastal wetlands exchange water with groundwater?
Groundwater is not a permanent underground lake. It moves through pores and cracks because differences in water level create hydraulic gradients. Rain that enters an upland aquifer may travel toward a marsh, seep through its edge, or contin
What you’ll learn
- Groundwater meets the coastExplain why coastal wetlands must be understood through both surface flow and groundwater.Groundwater connects uplands, wetland sediment, and estuaries through hidden flowpaths.
- Tides pump porewaterDescribe how tides, channels, sediment, and residence time move porewater.Tidal pressure repeatedly mixes fresh and saline water below the surface.
- Chemistry changes undergroundTrace how oxygen, carbon, and sediment reactions transform dissolved materials.Groundwater chemistry changes as microbes and minerals act along a flowpath.
- Exchange shapes wetland functionConnect groundwater exchange with salinity, roots, nutrients, sea-level rise, and pumping.Subsurface water movement changes the conditions plants and estuaries experience.
- Measure and manage exchangeEvaluate hydraulic, chemical, tracer, model, and restoration evidence.Good management follows the mechanism with repeated measurements above and below ground.
Questions this course answers
Why should a wetland water budget include groundwater?
Groundwater can enter, leave, or circulate through wetland sediment and carry heat, salts, nutrients, or contaminants.
Put the flowpath in a sensible order.
Recharge creates a hydraulic gradient, which drives flow toward the coastal wetland and estuary.
Match each feature with its role.
Tides, sediment water, channels, and time interact to control subsurface exchange.
What is porewater?
Porewater fills spaces in sediment and can have chemistry different from nearby surface water.
Why can groundwater change nitrogen before it reaches an estuary?
Groundwater transport and biogeochemical reaction are connected processes in wetland and coastal sediment.
How many broad water sources can meet in a coastal wetland?
Rain or upland groundwater, river water, tidal water, and recirculated saline groundwater can all contribute.
Grounded in trusted sources
- U.S. Geological Survey, Environmental Geochemistry - Coastal Aquifers, Wetlands, and Tidal Exchange, https://www.usgs.gov/centers/whcmsc/science/environmental-geochemistry-coastal-aquifers-wetlands-and-tidal-exchange
- U.S. Geological Survey, Coastal Aquifers, https://www.usgs.gov/programs/cmhrp/science/coastal-aquifers
- U.S. Geological Survey, Submarine Groundwater Discharge, https://www.usgs.gov/centers/pcmsc/science/submarine-groundwater-discharge
- U.S. Geological Survey, Freshwater-Saltwater Interactions along the Atlantic Coast, https://water.usgs.gov/ogw/gwrp/saltwater/gwflow.html
- U.S. Geological Survey, Submarine ground-water discharge: nutrient loading and nitrogen transformations, https://www.usgs.gov/publications/submarine-ground-water-discharge-nutrient-loading-and-nitrogen-transformations
- U.S. Geological Survey, Geologic effects on groundwater salinity and discharge into an estuary, https://www.usgs.gov/publications/geologic-effects-groundwater-salinity-and-discharge-estuary
- U.S. Environmental Protection Agency, Nutrient Criteria Technical Guidance Manual: Wetlands, https://www.epa.gov/sites/production/files/2018-10/documents/nutrient-criteria-manual-wetlands.pdf
- Wikimedia Commons MediaWiki API, https://commons.wikimedia.org/w/api.php
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