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Sky Lake water level data, 2016-2018, Humphreys County, Mississippi


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Resource type: Composite Resource
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Created: Aug 25, 2019 at 7:35 p.m.
Last updated: Dec 28, 2019 at 7:50 a.m.
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Abstract

Lake stage, wetland stage, and groundwater levels in 11 wells collected by Michael C. Gratzer at the University of Mississippi Department of Geology & Geological Engineering. Data used in the following with abstract below: Gratzer, M.C., Davidson, G.R., O'Reilly, A.M., and Rigby, J.R., (in press 12/2019), Groundwater recharge from an oxbow lake-wetland system in the Mississippi Alluvial Plain, Hydrological Processes, https://doi.org/10.1002/hyp.13680

The Mississippi River Valley Alluvial Aquifer ranks among the most over-drafted aquifers in the United States due to intensive irrigation. Concern over declining water levels has increased focus on understanding the sources of recharge. Numerous oxbow lakes overlie the aquifer which are often considered hydraulically disconnected from the groundwater system due to fine-grained bottom sediments. In the current study, groundwater levels in and around a 445-ha oxbow lake-wetland in Mississippi were monitored for a two-year period that included an unusually long low-water condition in the lake (>17 months), followed by a high-water event lasting over four months before returning to earlier low water levels. The high water pulse (>4 m rise) provided a unique opportunity to track the impact in the underlying alluvial aquifer. During low-water conditions, groundwater flowed westward beneath the lake. Following the lake rise, groundwater beneath and near the perimeter responded as quickly as the same day, with more delayed responses moving away from the lake. Within two months, a groundwater mound formed near the center of the oxbow (>3 m increase), with a reversal in the local hydraulic gradient toward the east. Flow returned to a westward gradient when the lake level dropped back below 0.3 m. Analysis of precipitation and nearby river stage could not account for the observed behavior. Recharge to the aquifer is attributed to rising water levels spreading over point bar deposits and into surrounding forested wetlands where preferential flow pathways are likely to exist due to buried and decomposing tree remains. An earlier study in the wetland demonstrated increasing redox potential in isolated zones, consistent with the existence of preferential flow pathways through the bottom sediments (Lahiri & Davidson, this issue). Retaining high water levels in oxbow lakes could be a relatively low-cost water-management practice for enhancing aquifer recharge.

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Resource Level Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Sky Lake
North Latitude
33.3100°
East Longitude
-90.4500°
South Latitude
33.2400°
West Longitude
-90.5300°

Temporal

Start Date:
End Date:

Content

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
Mississippi Water Resources Research Institute

Contributors

People that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.

Name Organization Address Phone Author Identifiers
James R. Rigby USDA-ARS National Sedimentation Laboratory ORCID

How to Cite

O'Reilly, A. M., M. C. Gratzer, G. R. Davidson (2019). Sky Lake water level data, 2016-2018, Humphreys County, Mississippi, HydroShare, http://www.hydroshare.org/resource/05481f58200b49d4a0f4d542d4e15da1

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

 http://creativecommons.org/licenses/by/4.0/
CC-BY

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