Abstract
Surface wave-induced bottom pressure fluctuations produce shear stresses in soft muddy bottom sediments that cause the sediments to undergo oscillatory motion. This motion can be described as a “mud-wave” and causes surface wave properties to vary from those that occur over a rigid bottom. Theoretical studies have attempted to describe this interaction using a variety of soil models, i.e., viscous fluid, elastic solid, viscoelastic material and nonlinear viscoelastic. Although the experimental basis for evaluating the validity of these assumptions is incomplete, it appears that a nonlinear viscoelastic soil model is required to describe the observed behavior. An example of the interaction of hurricane waves and soils found offshore of the Mississippi Delta is considered in detail. The soil is described using a model which is nonlinear in relating shear strain to shear stress and damping ratio. The surface wave-mud wave interaction for hurricane waves is significant and causes wave heights of 70 ft (21.3 m) and 80 ft (24.4 m) in deep water to decrease to values of from 10 ft (3.0 m) to 25 ft (7.6 m) at a water depth of 50 ft (15 m). Soil response during this wave-mud interaction is greatest at water depths of between 150 ft (45.7 m) and 250 ft (76.2 m). Maximum soil movements of 1.5 ft (.46 m) are predicted to occur under hurricane waves. As a means for making rough calculations of the wave-mud interaction a simplified technique for making engineering predictions is presented. The technique is based upon a nonlinear stress-strain and damping-strain soil model and predicts surface wave attenuation, soil shear stress and shear strain profiles.
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Suhayda, J.N. (1986). Interaction Between Surface Waves and Muddy Bottom Sediments. In: Mehta, A.J. (eds) Estuarine Cohesive Sediment Dynamics. Lecture Notes on Coastal and Estuarine Studies, vol 14. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-4936-8_18
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DOI: https://doi.org/10.1007/978-1-4612-4936-8_18
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