Tracking watershed change using lake sediments on the Bruce Peninsula, Ontario, Canada

Date

2019-06-18

Authors

McCarrel, Kyle

Journal Title

Journal ISSN

Volume Title

Publisher

University of Guelph

Abstract

Sediment transports nutrients to lakes through overland runoff and streamflow, influenced by watershed weather and land use/management. Understanding climatic and land use influences on sediment transport rates is important for ongoing and future erosion control strategies, though difficult to disentangle. Using a paleolimnological approach in a watershed with consistent land use over time, insight can be gained on past sediment yields. In this study, lake sediment cores were collected from a lake draining a small watershed on the Bruce Peninsula. Sediment grain size was measured at a fine-scale in five sediment cores and compared to instrumental and historical records. High-flow timings have changed from a spring-dominated regime to more frequent high-flow events throughout the winter. Since the 1960s, sediment accumulation rates decreased. From this work, it was concluded that sediment yield from Judges Creek watershed decreased as a result of earlier streamflow peaks occurring when less sediment is available.

Description

Keywords

sediment, grain size, paleolimnology

Citation