Overtopping Flow Properties Characterization in Laboratory and Prototype Through the Combination of Non Intrusive Instrumental Techniques

Abstract

Overtopping events may cause different failure modes depending on overtopped flow characteristics. Most of the studies about overtopping hazard analysis link the damages caused by the overtopping event to its mean overtopping discharge (q), which provides no information about overtopped flow characteristics or its spatial distribution. In this paper it is presented a non intrusive measurement system based on video imagery techniques and optical level sensors (OLS), which aim is to obtain overtopped highly aerated flows´ principal characteristics: velocity, volume, and density, in order to deep in the knowledge of this phenomenon, and minimizing the damages that it may cause to port´s infrastructures and exploitation

A novel system for in-situ, wave-by-wave measurements of the speed and volume of coastal overtopping.

“…In addition, the speed of the overtopping water is very rarely measured (in particular for dense spray overtopping) even though speed is a critical factor when estimating hazard, particularly to pedestrians 12 . Other methods such as optical techniques 13 and resistance gauges 14 have occasionally been trialled in ume studies of green water overtopping (rather than spray) but these techniques have not been scaled up for eld deployment. Radar 15 , laser 16 and (camera) image-processing 17 technologies are also being investigated as potential ways to measure overtopping in the eld but these approaches are subject to weather conditions (affecting the signal intensity), blockage (e.g.…”

Non-Intrusive Measurements of Wave-Induced Flow over Dikes by Means of a Combined Ultrasound Doppler Velocimetry and Videography

“…Some researchers (among the others, [21][22][23]) proposed alternative methods based on videography to reconstruct water elevation by side-wall camera, and the technique was also used to investigate sand bed evolution in nearshore zone [24,25] and the performance of floating bodies [26,27]. More complex optical approaches, like Particle Tracking Velocimetry (among the others, [28,29]), Particle Image Velocimetry (among the others, [30,31]), and Bubble Image Velocimetry (among the others, [32]) were shown to provide accurate results in the description of velocity field (i.e., streamlines, pathlines) and air entrainment during wave breaking and impacts [33,34], but only a few studies [35][36][37] examined wave overtopping process at dikes through image-based techniques.…”

A system for in-situ, wave-by-wave measurements of the speed and volume of coastal overtopping

“…In addition, the speed of the overtopping water is very rarely measured (in particular for dense spray overtopping) even though speed is a critical factor when estimating hazard, particularly to pedestrians 12 . Other methods such as optical techniques 13 and resistance gauges 14 have occasionally been trialled in flume studies of green water overtopping (rather than spray) but these techniques have not been scaled up for field deployment. Radar 15 , laser 16 and (camera) image-processing 17,18 technologies are also being investigated as potential ways to measure overtopping in the field but these approaches are subject to weather conditions (affecting the signal intensity), blockage (e.g.…”