The Significance of Hydrodynamic Forces in Coastal Embankment Design

by Bang-Fuh Chen, (M.ASCE), Natl Sun Yat-Sen Univ, Kaohsiung, Taiwan,



Document Type: Proceeding Paper

Part of: Ocean Wave Measurement and Analysis

Abstract: The dynamic forces of sea water and backfill soil acting on coastal embankment are analyzed by using a new finite-difference method. The Euler's equation and continuity equation are used to solved the nonlinear hydrodynamic pressures of the sea water. The backfill soil at another side of the embankment is modeled as the fluid-filled solid mixture. The momentum equation and storage equation of the saturated elastic solid mixture are combined to derive the pressure wave equation of the backfill soil. The pressure wave equation of sea water was solved by a developed finite difference method, while the pressure wave equation of solid mixture are solved by an implicit finite difference method coupled with a fast Poisson solver. the hydrodynamic pressure of sea water on embankment face are significantly increasing as the slope of the sea bottom increasing. the pore pressure and the interaction force between soil solid and fluid can be augmented significantly when the backfill soil is compressed during earthquakes, and the augmented dynamic pressure may result in the liquefaction of the backfill soil.

Subject Headings: Soil pressure | Wave pressure | Sea water | Wave equations | Dynamic pressure | Soil water | Backfills

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