3-D Observation of Water Surface in the Nearshore using Stereo Camera
In this study, laboratory experiments were conducted in a two-dimensional wave flume (100 m long, 2 m wide and 3 m deep) at Chonnam National University, Korea, in order to consider morphological beach processes caused by storms. Herein, a stereo imaging system (called WASS) was installed on the top to measure both beach face and water surface in 3-D continuously changing in time over the swash and surf zones. Wave heights and periods over the cross-shore transect in the surf zone were extracted from the measurements of 3-D water surfaces in time. The extracted wave results were well compared with the in-situ sensor data. Spatial wave run-ups could be also derived from the 3-D water surface measurements. The spatial and temporal hydrodynamic results obtained by the stereo image system were used to comprehensively describe morphological changes of the beach and be inputs to numerical simulations.