Abstract
Relationship between wave-driven coastal seepage and topographical changes in swash zone is investigated, through experiment and numerical modelling. Behavior of phreatic surface and moisture characteristic of unsaturated sand are measured experimentally. As the result, upward directed exfiltration flux show that, in case of eroded beach, unstabilization of beach face leads to increasing backwash transport. The numerical modelling simulates the interacting wave motion and groundwater flow. The present result indicates that, seaward and upward directed groundwater flow due to rising of phreatic surface induced fluidisation of sand layer of saturated region. These patterns of flow have implication for erosion process.
