A stereoscopic method for rapid monitoring of the spatio-temporal evolution of the sand-bed elevation in the swash zone

► We develop a stereoscopic technique to measure the evolution of the swash zone. ► Highly resolved measurements are obtained both in time and in space. ► An accuracy of less than 300 μm is obtained on a large-scale field. ► A complex evolution of the swash zone involving accretion and erosion is highlighted.