Wave action, particularly during storms, drives the evo lution of beaches. Beach evolution by non-linear break ing waves is poorly understood due to its three-dimensional character, the range of scales involved, and our limited understanding of particle-wave interactions. We show how a novel, three-phase extension to the classic “Hele-Shaw‿ laboratory experiment can be designed that creates beach morphologies with breaking waves in a quasi-two-dimensional setting. Our thin Hele-Shaw cell simplifies the inherent complexity of three-phase dynamics: all dynamics become clearly visible and measurable. We show that beaches can be created in tens of minutes by several types of breaking waves, with about one-second periods. Quasi-steady beach morphologies emerge as function of initial water depth, at-rest bed level and wave-maker frequency. These are classified mathematically and lead to beaches, berms and sand bars.
|Place of Publication||Enschede|
|Publisher||University of Twente, Department of Applied Mathematics|
|Number of pages||5|
|Publication status||Published - Feb 2013|
|Publisher||Department of Applied Mathematics, University of Twente|
- Water waves
- Granular Flows
- Geophysical fluid dynamics
- Coastal engineering
Bokhove, O., van der Horn, AB., van der Horn, A. J., van der Meer, R. M., Gagarina, E., Zweers, W., & Thornton, A. R. (2013). Revisiting Hele-Shaw dynamics to better understand beach evolution. (Memorandum; No. 2004). Enschede: University of Twente, Department of Applied Mathematics.