Contrasting human versus climatic impacts on erosion

TitleContrasting human versus climatic impacts on erosion
Publication TypeJournal Article
Year of Publication2015
AuthorsCook, Timothy L., Yellen Brian C., Woodruff Jonathon D., and Miller Daniel
JournalGeophysical Research Letters
Volume42
Pagination6680 - 6687
Date Published08/2015
KeywordsAmherst Lake, erosion, floods, mass accumulation rate, Tropical Storm Irene
Abstract

Both human activity and climate change can influence erosion rates and initiate rapid landscape change. Understanding the relative impact of these factors is critical to managing the risks of extreme erosion related to flooding and landslide occurrence. Here we present a 2100 year record of sediment mass accumulation and inferred erosion based on lacustrine sediment cores from Amherst Lake, Vermont, USA. Using deposition from August 2011 Tropical Storm Irene as a modern analogue, we identified distinct event deposits indicative of destructive erosion events. These deposits record a prolonged (multidecadal) interval of enhanced erosion following the initial storm-induced landscape disturbance. The direct impact of human land cover alteration is minimal in comparison to the more recent twentieth century increase in the occurrence of catastrophic erosion linked to overall wetter conditions that favor high erosion rates and more easily trigger landslides during periods of extreme precipitation.

DOI10.1002/2015GL064436