Distribution of Large Woody Debris after a big flood, North Fork Watershed, Missouri Ozarks

Authors: Leah Bournival*, Missouri State University, Robert T Pavlowsky, Missouri State University, Derek J Martin, Appalachian State University
Topics: Geomorphology
Keywords: Ozarks, Missouri, flood,
Session Type: Poster
Day: 4/12/2018
Start / End Time: 1:20 PM / 3:00 PM
Room: Napoleon Foyer/Common St. Corridor, Sheraton, 3rd Floor
Presentation File: No File Uploaded

Hydrological studies in the Midwest United States indicate an emerging trend of increasing magnitude and frequency of river flooding across the region. However, the effects of a more active flood regime on fluvial wood recruitment, transport, and geomorphic impacts are not well understood. Few studies have been untaken on large woody debris (LWD) in the Missouri Ozarks. Therefore, the purpose of this study is to compare the characteristics and spatial patterns of fluvial wood in three tributaries the North Fork of the White River in the Missouri Ozarks following a “1000-year” flood event which occurred in April-May 2017. To evaluate the influence of watershed scale on LWD, sampled All pieces >0.1 m diameter and >1.5 m were located by GPS, tagged and characterized according to orientation, size, condition, and geomorphic effect, and jam volume was also measured. Total debris volume and jams varied considerably between the three reaches. An increase in drainage area and stream size affect wood recruitment, transport, and flood impacts. Results will aid in understanding how floods influence LWD recruitment and transport in drainage areas of varying size.

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