Disintegrating retrogressive landslides on very‐low‐angle subaqueous slopes, Mississippi delta

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Abstract
Side‐scan sonar records from the interdistributary bay areas of the Mississippi delta (East Bay, Garden Island Bay, and shallow water areas adjacent to Pass à Loutre) have shown widespread subaqueous disturbance of the bottom sediments. These occur in shallow water and on slopes with very low inclinations (0.01°‐0.45°). The morphology of the features is indicative of mass movement processes involving subsidence and downslope translatory movements. The precise conditions under which failure occurs have not been fully documented, but a conceptual model of potential factor interaction can be formulated.