Date of Award

2011

Degree Type

Thesis

Degree Name

M.Sc.

Department

Earth and Environmental Sciences

First Advisor

Maria T Cioppa

Second Advisor

Alan S Trenhaile

Keywords

beaches, magnetic minerals, magnetic susceptibility, sediment transport, sorting, tracers

Rights

CC-BY-NC-ND 4.0

Abstract

A study was conducted along the coast of Point Pelee National Park in northern Lake Erie to address uncertainties over the sediment transport of fine magnetic minerals (< 250 micrometres) in the swash zone. Magnetic tracers (magnetite) were tracked with a magnetic susceptibility meter, and for comparative purposes, fluorescent tracers were also used to track the movement of two sizes (< 250 micrometres and > 250 micrometres) of non-magnetic grains (quartz and calcite). Despite higher threshold shear stresses and settling velocities than for the coarse non-magnetic tracers, movement of the magnetic tracers was much slower and less prolonged, with the magnetic tracers eventually being buried and deposited into the upper foreshore. The results suggest, under low to moderate wave energy conditions, magnetic grains remain below the surface in the swash zone and do not contribute to the net sediment transport, and only move during high energy wave conditions.

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