Browsing by Author "Simarro, Gonzalo"
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- Effect of viscosity on the equilibrium scour depth at single cylindrical piersPublication . Lança, Rui; Simarro, Gonzalo; Fael, Cristina; Cardoso, AntónioMost studies on scouring seem to have overlooked the effect of viscosity, the assumption being that the flow is free of viscous effects inside the scour hole because of the presence of highly turbulent flow structures such as down-flow, horseshoe vortex, and wake vortices irrespective of the approach flow regime. The present work reports the results of experiments conceived to revisit the effect of viscosity on scouring. The experiments were performed by changing the Reynolds-like numbers for two flowshallowness values and keeping constant the remaining dimensionless parameters that control the scour process. Thevalues of theReynoldsnumber corresponded to transitional approach flows. The experimental results indicate that scouring does depend on viscosity in usual laboratory conditions, the viscous effect leading to scour depths in the safety side.
- Morphodynamics assessment by means of mesoforms and video-monitoring in a dissipative beachPublication . Montes, Juan; Simarro, Gonzalo; Benavente, Javier; Plomaritis, Theocharis; del Río, LauraIn this study a video-monitoring system was used to analyze the presence of mesoforms during a time period of five years in the urban beach of La Victoria, Cadiz, Spain. This technique allowed the generation of plan views using an improved version of ULISES software. The presence and spatiotemporal variability of the most common mesoforms, such as bars and cusps, was identified in all the plan views. Furthermore, the morphodynamic state of the beach was investigated in combination with local hydrodynamic data. The cusp systems were also studied by means of wavelet analyses and different theories on cusps formation were tested. The presence of the investigated features was related to the wave energy and its seasonal variations. The behavior of the mesoforms demonstrated the important role of a subtidal rocky outcrop in the nearshore processes. The results also show that bars and cusps as indicators of the nearshore processes are a useful tool for the macroscopic analysis of surf zone dynamics in dissipative beaches.