Abstract
Chenier ridges along the Louisiana Chenier Plain formed over the past 3,000 years as a function of sediment supply, incident wave/current energy, and relative sea-level change. Spatial variations in ridge elevations suggest that geologic-scale processes, such as sea-level changes and variations in sediment supply, produce distinct morphologies. The exact process by which ridge morphologies evolve is not well understood, primarily due to complexities associated with upland sediment sources (i.e., variations in magnitude and composition of sediment sources) and redistribution along the coast. Relative sealevel changes add another level of uncertainty regarding geomorphic evolution of coastal ridge deposits. Subsidence-corrected chenier ridge elevations for four primary ridge trends (paleoshorelines) along the Louisiana Chenier Plain illustrate a maximum elevation difference of approximately 1 m over a maximum period of about 1,700 years, possibly reflecting short-term variations in relative sea level.
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