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Preferential flow between rivers and aquifers in alluvial floodplains

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Type:	Resource
Storage:	The size of this resource is 59.4 MB
Created:	Aug 25, 2021 at 9:58 p.m.
Last updated:	Jan 13, 2023 at 2:09 p.m.
DOI:	10.4211/hs.f93624835f5145c2b597c9944aca9357
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Sharing Status:	Published
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Abstract

Preferential flow between rivers and aquifers in alluvial floodplains may be a core component of shallow groundwater transport and, consequently, its understand- ing is key to modelling and managing groundwater resources. At a clay wedge separating present-day streamflow and bank storage from an adjacent shallow aquifer, we image a suspected sand-dominated structure. This structure cuts through the clay wedge and possesses temporally dynamic electrical resistivity as seen in time-lapse electrical resistivity tomographic (ERT) images collected over a 61-day study period. During days 11–12, following heavy rainstorms, the cross section of the electrically resistive sand fades into the background resistivity structure, reappearing the following day. This research shows that preferential flow can be imaged in time-lapse ERT in buried sand-dominated structures between a floodplain and the adjacent river. Our analysis demon- strates that sand conduits can transport infiltrated rainwater from the floodplain into the river as a bank spring and, hypothetically, at high-stage streamflow, from the river into the adjacent shallow aquifer. In both directions, these conduits for preferential flow exert an important control on the regulation and distribution of water, sediments and contaminants. This phenomenon will help hydrological models to incorporate more real-world phenomena and ultimately better prepare groundwater managers to sustainably steward shallow groundwater resources.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:

WGS 84 EPSG:4326

Coordinate Units:

Decimal degrees

Place/Area Name:

Texas A&M University Research Farm

Longitude

-96.4240°

Latitude

30.5542°

Temporal

Start Date:
End Date:

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Related Resources

The content of this resource is derived from	National Oceanic and Atmospheric Administration
The content of this resource is derived from	United States Geological Survey

Credits

Funding Agencies

This resource was created using funding from the following sources:

Agency Name	Award Title	Award Number
United States Geological Survey	104B State Water Resources Research Institute Program	06-505264-01007-M1903160

How to Cite

Martin, J. M. (2023). Preferential flow between rivers and aquifers in alluvial floodplains, HydroShare, https://doi.org/10.4211/hs.f93624835f5145c2b597c9944aca9357

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/

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