SURFACE-GROUNDWATER FLOW NUMERICAL MODEL FOR COASTAL BARRIER BEACH

  • Eranda Perera
  • Fangfang Zhu
  • Nicholas Dodd
  • Riccardo Briganti
  • Chris Blenkinsopp

Abstract

Fine-grain beaches are relatively common where the beach forms part of a larger coastal barrier system. In such a coastal system, different water levels could be present in the seaward side and back-barrier lagoon. The water level changes in the steady-state lagoon may potentially induce groundwater dynamics near the beach which would subsequently affect seepage flow into (or out of) the beach. The exchange of water could generate varying hydrodynamical and morphodynamical behaviour at the seaward boundary. Hence, it is important to gain insight into groundwater flow dynamics which results in exchange of water between sea, barrier and lagoon; especially for coastal engineers responsible for planning and managing such a coastal environment. In present work, a numerical model is developed to simulate flows through a coastal barrier and it is validated against prototype-scale experimental results, which can then be extended to model small time-scale groundwater flows that may be too expensive or impractical to set up in a lab.

References

Briganti, Dodd, Kelly and Pokrajac (2012): An efficient and flexible solver for the simulation of the morphodynamics of fast evolving flows on coarse sediment beaches, International Journal for Numerical Methods in Fluids, 69:859-877.

Liggett and Liu (1983): The boundary integral equation method for porous media flow, Volume 5.

Turner, Rau, Austin and Andersen (2016): Groundwater fluxes and flow paths within coastal barriers: Observations from a large-scale laboratory experiment (BARDEX II), Coastal Engineering, 113:104-116.

Published
2018-12-30
How to Cite
Perera, E., Zhu, F., Dodd, N., Briganti, R., & Blenkinsopp, C. (2018). SURFACE-GROUNDWATER FLOW NUMERICAL MODEL FOR COASTAL BARRIER BEACH. Coastal Engineering Proceedings, 1(36), risk.92. https://doi.org/10.9753/icce.v36.risk.92

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