Electronic Theses and Dissertations

Date

2022

Document Type

Thesis

Degree Name

Master of Science

Department

Civil Engineering

Committee Chair

Brian Waldron

Committee Member

Daniel Larsen

Committee Member

Scott Schoefernacker

Abstract

Streambed hydraulic conductivity and thickness are key parameters in determining water exchange between groundwater and surface water (GW/SW). Streambed in-situ measurements were conducted for the three streams that transverse Shelby County, Tennessee: the Wolf River, Loosahatchie River, and Nonconnah Creek. Slug tests provided estimations of horizontal hydraulic conductivity (Kr) at depths of 0.5, 1, and 1.5 m. Grain size analyses on core samples extracted to a depth of 2.7 m allowed to characterize the sediment material of the streambeds. Scour devices were designed and installed to estimate the mobile streambed thickness. The Wolf and Loosahatchie streambed sediment is characterized as relatively homogenous, composed mainly of sand with intermittent clay lenses; with (Kr) ranging from 50 to 190 m/d, and a maximum scouring depth of 40 cm and 85 cm, respectively. Nonconnah Creek has notably different characteristics with higher Kr (>200 m/d) at the shallowest depth due to gravel, and an abrupt decrease with depth (<1m/d) due to an extensive clay layer located at around 1 m deep; minimal to no scour was observed. The new data of this investigation provides additional constraints on GW/SW flow models.

Comments

Data is provided by the student.

Library Comment

Dissertation or thesis originally submitted to ProQuest

Notes

Open Access

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