Abstract
The influence of saturated-unsaturated sloped beach on sediment transport in swash zone is investigated experimentally and numerically. The movement of fluorescent sand on seabed and the orbit of fluorescent paint injected into sandy beach are measured in bore wave experiments. As the result, the uplift seepage flow leads to the activation of sediment transport in the direction of run-up and backwash under the saturated slope. The numerical modelling simulates the interacting swash wave motion and saturated-unsaturated coastal seepage flow. The tractive force under the influence of seepage flow is quantified through a permeable Shields parameter. The results of prediction are in good qualitative agreement with those of experiments.
Highlights
Roads, railways and residential areas along the coastline are damaged due to storm-induced erosion in Japan
4.4 Dimensionless Tractive Force Model of Permeable Slope We examine the sediment transport under the influence of wave-induced seepage flow by using nondimensional tractive force
The flux exfiltrated from the seepage face due to discontinuity of water surface of run-up wave and phreatic surface becomes larger according as the phreatic surface rises. This uplift seepage seems to lead to the unstable condition of the beach face on backwash
Summary
Railways and residential areas along the coastline are damaged due to storm-induced erosion in Japan. A numerical approach due to a Boussinesq model coupled with a porous flow model to estimate the sediment transport in swash zone has been presented by Karambas (2002). The effect of saturated-unsaturated seepage flow on sediment transport may have an important implication for the shore erosion process under storm conditions. Using a bore wave, the experiments that simplified the phenomenon of swash motion are conducted to clarify the characteristics of sediment transport in swash zone due to the saturated-unsaturated sloped beach. A numerical approach for coupling run-up waves with porous flow in a coastal aquifer and estimation of the tractive force under the influence of seepage flow are presented. The effects of saturated-unsaturated seepage flow on sediment transport in swash zone are investigated through the present model calculations
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