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Groundwater-riverwater density contrast: its effect on the pattern of groundwater discharge to the River Murray

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Created 14/01/2025

Updated 14/01/2025

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A density contrast between river water and groundwater causes the pressure in the aquifer below the River Murray to be less than that in the aquifer adjacent to the river. The magnitude of the pressure difference is proportional to the depth of the river, and groundwater discharge is biased toward the zones of maximum pressure difference. These zones are the deepest sections of the river, herein called trenches. Groundwater entrainment from the trenches causes plumes of salinised (and hence denser) river water to flow along the bottom of the river. These plumes are fully mixed with the river water where the river is shallow. River salinity measurements and computer modelling of the density contrast effect indicate that the groundwater discharge per unit length of river is 40-60% greater at a trench than elsewhere.

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Title Groundwater-riverwater density contrast: its effect on the pattern of groundwater discharge to the River Murray
Language eng
Licence Not Specified
Landing Page https://devweb.dga.links.com.au/data/dataset/a90c7c63-e318-4a08-8fed-c2044f97f83d
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
Data Portal Data.gov.au