WaveCams: the waves have arrived, where do they come from?

Today we change our perspective. In the previous posts about time-stack construction that allows us to estimate the period and height of the waves, we have always been looking at our beach in a one-dimensional cross-section. Today we will be looking at the waves in two dimensions. The wave direction plays an important role in multiple processes on the coast, it can drastically change the degree of exposure of our beach to storm events, changing the current’s direction and magnitude modifying sediment transport. In short, without an estimation of the direction in which the waves arrive at the coast, the hydro-morphological analysis would be incomplete. To illustrate, let’s travel to […]

WaveCams Time-Stack: Height, energy and more

Welcome back! Today will be our last post of the first WaveCams Time-stack trilogy. We recommend to review our previous posts before starting (What is a time-stack? and the “Time Dimension”). How do we know we can approach the beach safely? Intuitively, we know if the sea is agitated or not, it is easy to perceive the deafening noise of the waves or to notice the great amount of foam produced when big waves break! All the above phenomena are coming from the same process of energy conversion: the bigger the wave, the more energy it carries and therefore the more noise and foam it generates. The breaking of waves […]

WaveCams Time-Stack: The Time Dimension

Welcome to this new post! Today we will introduce the temporal dimension of our Time-stack, if you haven’t seen the explanatory video about this useful image yet I invite you to watch it here so you can better understand what we will see next. When we go to the beach and appreciate the waves our brain automatically interprets the differences in light (light and shadow) as waves that are directed towards us, so we manage to identify patterns on the surface of the sea. If we think about detecting the waves by remote devices, this shadow-light contrast is very useful and interesting to exploit. As we have seen in the […]

How is your beach doing ?

From topographies generated by Wavecams technology, Waves’n see establishes diagnostics revealing the health state of a beach, by measuring the erosion during stormy events, and the accretion during the following recharges. First, a straightforward approach consists in extracting topography at points of interest, located for example in the upper/lower part of a beach, and on each sides of a groyne, in order to evaluate the different erosion and accretion phases. Then, in order to assess alongshore and cross-shore sediment transport, a joint analysis of topography evolution along transects (cross-shore and along-shore) is carried out. At a larger scale, global statistics of topography (mean height, successive height and volume difference, cumulative […]

Wavecams topography validation

Wavecams topographies are validated by comparison with independent topography measurements: DGPS and Lidar data if available. Here is an example of validation with DGPS measurements acquired in the central part of Etretat bay on the 10th of January 2020, through the following 3D interactive figure (to move inside the figure: left clic(rotation), mouse wheel( zoom), right clic(translation)) : After interpolation of DGPS data on our topography grid, we obtain very good validation results: MAE=27cm, RMSE=32cm (MAE: Mean average Error, RMSE: Root Mean Square Error) Here is an example of validation with Lidar measurements acquired in the whole Etretat bay on the 28th of August 2019, through the following 3D interactive […]