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Quantifying Exceedances of Chloride Water Quality Guidelines in Niagara Escarpment Streams Around Hamilton, Ontario Using High- Frequency Data

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posted on 2024-06-19, 00:56 authored by Wyatt Weatherson

Though stream chloride concentrations ([Cl]) have been shown to be increasing in cold regions worldwide, the frequency and duration of exceedances of the freshwater chronic and acute guidelines for safe exposure of aquatic life to chloride are understudied. Streamwater [Cl] for nine watersheds located along the Niagara Escarpment around Hamilton, Ontario were modeled using concentration-conductivity regressions with high frequency specific conductivity data between March 2020 and June 2021. Analyses of [Cl] dynamics at these sites suggests that stream [Cl] occasionally exceeds the Canadian acute guideline and regularly exceeds the chronic guideline. This study highlights the dilution of stream [Cl] by precipitation events in the non-salting season, which may provide temporary relief to aquatic organisms from otherwise toxic [Cl]. These results will help ecotoxicologists identify ecologically relevant exposure durations, ultimately serving to better inform regional understanding of the risk presented to Niagara Escarpment ecosystems from increasing [Cl] concentrations.

History

Language

eng

Degree

  • Master of Applied Science

Program

  • Environmental Applied Science and Management

Granting Institution

Ryerson University

LAC Thesis Type

  • Thesis

Thesis Advisor

Claire Oswald

Year

2022

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    Environmental Applied Science and Management (Theses)

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