T38 Geomorphic Evolution of River Corridors in the Eastern United States, Pleistocene to Anthropocene (Posters)

Sunday, 15 October 2023
8:00 AM - 5:30 PM
Hall B

ASSESSMENT OF HISTORICAL AND CURRENT REGIONAL GEOMORPHIC PARAMETERS IN OZARK STREAMS TO SUPPORT BANK STABILIZATION

Paper number: T38-1
Program: Technical Sessions
Time: 8:00 AM – 5:30 PM

Authors

Abstract

Using historical imagery analysis and current stream survey data we document the range and magnitude of change in stream channel morphology in representative streams within the Ozarks over the past 80 years. These results will be used by the US Army Corps of Engineers to develop broadly applicable guidance for ecological lift and bank stabilization that will streamline the permitting process for landowner bank stabilization projects. Aerial imagery from the 1940s to present was used to digitize plan view channel features. In-channel surveys are used to collect additional data about bedform composition, flow parameters, and bed material. Drone-based aerial surveys are used to generate high resolution orthophotography and digital elevation models of the current channel conditions. Our preliminary data from South Dry Sac streams shows that the width has changed since the 1950’s to today by 4 meters at least with some change in sinuosity. Sinuosity has changed from 1.018 to 1.005 since 1950 to 2015. With only area changed sensed from aerial photos is an increase in tree density, and housing on downstream left side of river. The data are compiled into a Geographic Information System that will streamline sharing, collaboration, and future analysis of channel morphology. US Army Corps of Engineers SOI: W81EWF-22-SOI-0035

Geological Society of America Abstracts with Programs. Vol. 55, No. 6

doi: 10.1130/abs/2023AM-388295

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