Channel modification and evolution alter hydraulic connectivity in the Atchafalaya River basin increasing vulnerability to sea-level rise

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Abstract

Channel dredging and erosion in the Atchafalaya River basin have resulted in changes to the hydraulic connectivity of this floodplain swamp that have not been previously quantified. In this study, analyses were conducted to determine hydraulic and geomorphic factors that have changed since channel closure in 1962. Results indicated changes occurred in the Atchafalaya main channel cross-section between 1962 and 2010, and hydraulic and geomorphic changes were detected in portions of the interior eastern basin floodplain. Analyses of hydrographs in relation to floodplain elevations indicated that there was a lack of mineral sediment deposition sufficient to offset subsidence and rising sea level. This deficit has resulted in extended hydroperiods over the floodplain which could prevent tree regeneration and promote hypoxia.

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Publication type Conference Paper
Publication Subtype Conference Paper
Title Channel modification and evolution alter hydraulic connectivity in the Atchafalaya River basin increasing vulnerability to sea-level rise
Year Published 2019
Language English
Publisher Federal Interagency Subcommittee on Sedimentation (SOS)
Contributing office(s) Lower Mississippi-Gulf Water Science Center
Description 11 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title Proceedings of SEDHYD 19
Conference Title SEDHYD 2019 Conference
Conference Location Reno NV
Conference Date June 24-28, 2019
Country United States
State Louisiana
Other Geospatial Atchafalaya River Basin
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