Asset Details
Do you wish to reserve the book?
The Impacts of Last Glacial Maximum Glaciers on Channels Downstream of the Glacial Termini in Southwestern Montana
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
The Impacts of Last Glacial Maximum Glaciers on Channels Downstream of the Glacial Termini in Southwestern Montana
Do you wish to request the book?
The Impacts of Last Glacial Maximum Glaciers on Channels Downstream of the Glacial Termini in Southwestern Montana
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Dissertation
The Impacts of Last Glacial Maximum Glaciers on Channels Downstream of the Glacial Termini in Southwestern Montana
2025
Overview
During the Last Glacial Maximum (LGM), extensive glaciation covered a significant portion of the Earth's surface, leading to substantial modifications of mountainous landscapes. Such glaciation can impact the evolution of landscapes downstream of valley glacier termini through the generation and supply of sediment, influencing the efficiency of fluvial erosion well downstream of glacial maxima. However, such influences are poorly understood and rarely constrained. We capitalize on a natural experiment in the Tobacco Root Mountains of southwestern Montana where glaciers impacted some valleys, while others remained ice-free, allowing the isolation of glacial impacts to specific river systems.We predict that downstream of the previously glacial terminus landscape normalized channel steepness will be higher as a result of the reduction in erosional efficiency due to increased sediment loading. To test this hypothesis, we measure mean grain size (D50) and normalized channel steepness (Ksn) to understand channel geomorphology and identify variations between previously glaciated watersheds and control watersheds. We calculate Ksn from a 10m DEM. Grain size measurements were collected in the field to quantify channel characteristics not evident in remotely sensed data but that could influence Ksn values. Results show that downstream of the glacial terminus normalized steepness index and grain size are consistently higher when compared to control watersheds, with grain size being 3x greater. We determine that the higher steepness values determined in previously glaciated watersheds is as a result of greater sediment supply available in channels downstream of previous glaciation. We illustrate that the legacy of glaciation on landscape evolution extends beyond the glacial limit, impacting erosion rates downstream of the glacial termini.
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
9798286433629
