Submarine Mudslide Morphology And Development Mechanisms, Mississippi Delta
D. B. Prior, J. N. Suhayda, 1981. "Submarine Mudslide Morphology And Development Mechanisms, Mississippi Delta", Offshore Geologic Hazards: A Short Course Presented at Rice University, May 2-3, 1981 for the Offshore Technology Conference, Arnold Bouma, Dwight Sangrey, James Coleman, David Prior, Anita Trippet, Wayne Dunlap, James Hooper
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Continued data acquisition from the Mississippi delta-front slopes has allowed more detailed evaluation of mudslide morphology. Subsidence source bowl geometry appears consistent with a retrogression model, Suggesting that they emlarge and develop upslope by a process of strain remodling following initial failure. Transport chutes have characteristics that suggest plug flow, and this is evaluated using a model developed foe subaerial debris flows. Undrained loading in the downslope depositional zones provides a mechanism to explain lobe progradation. A development sequence for mudslide evolution and elongation is outlined, consisting of three major stages: initial failure, retrogression and progradation, and loading and downslope propagation. The main implications for offshore engineering are that design criteria should acknowledge the site-specific characteristics os mudslides.