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- W2169294803 abstract "This paper presents a quantitative, dynamic model for simulating and predicting the evolution of the nearshore muddy profile on the abandoned Huanghe Delta, which has been undergoing severe erosion since the shift of the Huanghe River in 1855. The model computes the wave-induced bed shear stresses on the muddy profile, and therefore calculates the erosion rate. The sea level fluctuation caused by the oceanic tide plays an important role in redistributing the wave force and hence the sediment transport. This factor is introduced into the model. The steady-state nearshore muddy profile is simulated as a response to the average erosion rate of the local wave climate. However, at long time scales, the averaged erosion rate is significantly influenced by the surface sand armouring and the vertical increase with depth of cohesive sediment consolidation during coastal erosion, leading to an irreversible evolution of the muddy profile. The Effective Scouring Wave, derived from local wave climate, is proposed to quantitatively incorporate these time-variant geological influences. The evolution of the muddy profile is determined by the change in the Effective Scouring Wave climate. The eroding muddy coast exhibits a monotonic, concave upward profile, whose curvature increases as the coastal erosion continues. The maximum curvature of the profile lies below the mean low tidal level. As the erosion continues the maximum curvature moves down and shoreward. The position of the maximum curvature of the nearshore muddy profile can be used to estimate the evolutionary stages of the muddy coast. On the northern abandoned Huanghe Delta, the muddy profile approaches an equilibrium configuration when the maximum curvature reaches down to a water depth of about 6 m below the mean sea level. The model reveals a dynamic geomorphic system as a response to the abandonment on the Huanghe Delta. Similar patterns and evolutionary processes may be generalized to erosional muddy coasts in other settings." @default.
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- W2169294803 date "1998-02-01" @default.
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- W2169294803 title "Modeling of coastal profile evolution on the abandoned delta of the Huanghe River" @default.
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- W2169294803 doi "https://doi.org/10.1016/s0025-3227(97)00110-2" @default.
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