Degree Type

Thesis

Date of Award

2020

Degree Name

Master of Science

Department

Civil, Construction, and Environmental Engineering

Major

Civil Engineering (Environmental/Geotechnical Engineering)

First Advisor

Chris R Rehmann

Abstract

Saturated riparian buffers (SRBs) reduce nitrate export from agricultural tile drainage by infusing drainage water into carbon-rich riparian soils where denitrification and plant uptake can occur. The water quality benefits from SRBs are well documented but concerns about their effect on streambank stability have led to restrictive design standards that prevent widespread implementation. The relationship between SRB design conditions and streambank stability was examined through numerical slope stability modeling. The effect of the SRB installation was assessed by comparing no-flow and SRB flow conditions at study sites under a range of simulated conditions. In most cases, the addition of SRB flow did not cause instability which indicates SRBs have little effect on the overall stability of the streambank. A study of how the streambank height affects stability showed no significant relationship between the two when all other factors were considered. Regression analysis of dimensionless parameters derived from SRB site conditions resulted in a function to predict the factor of safety against failure at potential SRB sites.

DOI

https://doi.org/10.31274/etd-20200902-39

Copyright Owner

Loulou Claire Dickey

Language

en

File Format

application/pdf

File Size

90 pages

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