Cave and rock overhang slackwater deposits and their potential for paleoflood stage reconstruction in alluvial channel settings

Authors: Lisa Davis*, University of Alabama
Topics: Paleoenvironmental Change, Geomorphology, Water Resources and Hydrology
Keywords: paleo, fluvial, geomorphology
Session Type: Paper
Day: 4/11/2018
Start / End Time: 1:20 PM / 3:00 PM
Room: Napoleon B2, Sheraton 3rd Floor
Presentation File: No File Uploaded

The year 1931 marks the last time the U.S. did not experience a single flood-related fatality. Understanding and anticipating flood risk is made challenging, in part, by relatively short instrumented streamflow records, which rarely span more than 100 years and underrepresent less frequently occurring, large magnitude floods. Paleoflood analyses are used to lengthen flood records and reduce statistical uncertainty associated with flood frequency analyses. Slackwater deposits (SWD) sampled from caves and rock overhangs are considered to be indicators of maximum paleoflood stage and discharge in bedrock channel settings where channel form can be assumed to be more consistent through time. This presentation discusses the potential for SWDs to be used as paleostage indicators in more alluvial settings, where channel form is more prone to variability, as part of ongoing paleoflood research being conducted in the Tennessee River Basin (USA).

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