An assessment of Hurricane Harvey overwash sedimentation on the Matagorda Peninsula

Authors: Bradley Rains*, University of North Texas, Harry Williams, University of North Texas
Topics: Geomorphology
Keywords: Coastal Geomorphology, Overwash Sedimentation
Session Type: Paper
Day: 4/3/2019
Start / End Time: 2:35 PM / 4:15 PM
Room: Stones Throw 1 - Granite, Marriott, Lobby Level
Presentation File: No File Uploaded

Hurricane Harvey, a category 4 hurricane, produced record flood water levels in the Southeast Texas coast. Flood waters are a significant source of coastal plain erosion and re-deposition. Coastal plain erosion on the Matagorda Peninsula has resulted in numerous sediment plumes overlying existing marsh. The depositional strata of flood overwash events are characterized as coarse sandy deposits. Identifying, characterizing, and differentiating hurricane overwash sediment from existing marsh aggradation is the first step of this research. The sampling process includes gouge and push coring techniques. A preliminary investigation will provided the depth of sedimentation, spatial extent of the plumes, and effect on marsh aggradation overall. Sample points collected in a network across the plumes has shown large volumes of sediment moved by Hurricane Harvey. Past hurricane indicate transport routes, lateral distribution, and elevation significance of sedimentation processes. This study is to further the understanding of land loss and land gain of the coastal plain region in Southeast Texas. This work will contribute to coastal restoration projects by adding to the information of sediment aggradation and degradation produced from hurricane transport.

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