Roberto Gaudio
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View article: Laboratory study of orifice jets from a pressurized pipe
Laboratory study of orifice jets from a pressurized pipe Open
Orifice jet through a small opening or orifice into a surrounding fluid exhibits intricate fluid dynamics, encompassing the interaction of the jet with the fluid. Although the dynamics of simple jets has been extensively studied, there are…
View article: Application of spatiotemporal velocity method in concrete canals with vegetation patch
Application of spatiotemporal velocity method in concrete canals with vegetation patch Open
Abstract: Understanding the interaction of flow and vegetation in open canals has a great impact on better implementation of environmental projects and hydraulic engineering. The purpose of this research is to apply spatiotemporal (spatial…
View article: An Analysis and Comparison of the Hydrodynamic Behavior of Ships Using Mesh-Based and Meshless Computational Fluid Dynamics Simulations
An Analysis and Comparison of the Hydrodynamic Behavior of Ships Using Mesh-Based and Meshless Computational Fluid Dynamics Simulations Open
This paper presents a comparison of two turbulence models implemented in two different frameworks (Eulerian and Lagrangian) in order to simulate the motion in calm water of a displacement hull. The hydrodynamic resistance is calculated usi…
View article: Bedload transport through emergent vegetation: current status and its future prospect
Bedload transport through emergent vegetation: current status and its future prospect Open
Vegetation present in the water streams, on the banks and in the floodplain areas largely affects the river hydraulics. Indeed, river vegetation significantly influences hydrodynamics, sediment transport, bedforms, and pollutant transport.…
View article: Spatiotemporal variability of temperature in Friuli-Venezia Giulia (north-eastern Italy)
Spatiotemporal variability of temperature in Friuli-Venezia Giulia (north-eastern Italy) Open
<p>Alpine mountainous regions of northern Italy, constituting one of the major mountain areas in Europe, have been identified among the main vulnerable areas to climate change of the continent. In fact, over the last century, global …
View article: Hydrodynamics of a Bordered Collar as a Countermeasure against Pier Scouring
Hydrodynamics of a Bordered Collar as a Countermeasure against Pier Scouring Open
Countermeasures against local scour at bridge piers and abutments can be grouped into two categories: (1) flow-altering and (2) bed-armouring countermeasures. In this work, long-term laboratory-scale experiments of clear-water scour at bri…
View article: Relationship between eroded volume and main scour hole dimensions near quay walls caused by internal counter-rotating twin-propellers
Relationship between eroded volume and main scour hole dimensions near quay walls caused by internal counter-rotating twin-propellers Open
The present study aims at computing and analysing the eroded sediment volumes induced by twin-propeller jets near a vertical quay wall from the main geometric characteristics of the scour hole. Two different scouring mechanisms govern the …
View article: Simulation of Accelerated Subcritical Flow Profiles in an Open Channel with Emergent Rigid Vegetation
Simulation of Accelerated Subcritical Flow Profiles in an Open Channel with Emergent Rigid Vegetation Open
Even though both fluid mechanics and numerical studies have considerably progressed in the past decades, experimental knowledge remains an important tool for studying the resistance to flow in fluid media where a complex environment domina…
View article: An experimental study on the anisotropic and intermittent behaviour of a turbulent flow over a rough bed
An experimental study on the anisotropic and intermittent behaviour of a turbulent flow over a rough bed Open
The flow field in open channels can be classified into different zones according to the velocity distribution. To explore the anisotropic and intermittent behaviour in the turbulent flow layers, an experimental study was performed using Pa…
View article: Effects of fluvial instability on the bed morphology in vegetated channels
Effects of fluvial instability on the bed morphology in vegetated channels Open
Flume experiments are conducted to investigate the effect of streambed instability in channels with randomly-distributed vegetation, varying vegetation density and flow conditions, in the absence of upstream sediment supply. The bed morpho…
View article: Turbulent Flow through Random Vegetation on a Rough Bed
Turbulent Flow through Random Vegetation on a Rough Bed Open
River vegetation radically modifies the flow field and turbulence characteristics. To analyze the vegetation effects on the flow, most scientific studies are based on laboratory tests or numerical simulations with vegetation stems on smoot…
View article: Turbulence and Flow–Sediment Interactions in Open-Channel Flows
Turbulence and Flow–Sediment Interactions in Open-Channel Flows Open
The main focus of this Special Issue of Water is the state-of-the-art and recent research on turbulence and flow–sediment interactions in open-channel flows. Our knowledge of river hydraulics is deepening, thanks to both laboratory/field e…
View article: Turbulence and Flow–Sediment Interactions in Open-Channel Flows
Turbulence and Flow–Sediment Interactions in Open-Channel Flows Open
The main focus of this Special Issue of Water is the state-of-the-art and recent research on turbulence and flow–sediment interactions in open-channel flows. Our knowledge of river hydraulics is becoming deeper and deeper, thanks to both l…
View article: Hydrodynamics of a bordered collar as a countermeasure against pier scouring
Hydrodynamics of a bordered collar as a countermeasure against pier scouring Open
An experimental campaign on long-term clear-water scour at bridge piers with different configurations was performed in a laboratory to investigate the effects of different countermeasures. Tests were performed in a flume with a movable sed…
View article: Anisotropy in the Free Stream Region of Turbulent Flows through Emergent Rigid Vegetation on Rough Beds
Anisotropy in the Free Stream Region of Turbulent Flows through Emergent Rigid Vegetation on Rough Beds Open
Most of the existing works on vegetated flows are based on experimental tests in smooth channel beds with staggered-arranged rigid/flexible vegetation stems. Actually, a riverbed is characterized by other roughness elements, i.e., sediment…
View article: Bed Roughness Effects on the Turbulence Characteristics of Flows through Emergent Rigid Vegetation
Bed Roughness Effects on the Turbulence Characteristics of Flows through Emergent Rigid Vegetation Open
During floods, the riparian vegetation in a watercourse significantly changes the velocity distribution and the turbulence structures of the flow. However, a certain influence on them is always exerted by the bed sediments. The aim of the …
View article: Turbulent Flow Field around Horizontal Cylinders with Scour Hole
Turbulent Flow Field around Horizontal Cylinders with Scour Hole Open
This study presents the results of an experimental investigation on the flow-structure interactions at scoured horizontal cylinders, varying the gap between the cylinder and the bed surface. A 2D Particle Image Velocimetry (PIV) system was…
View article: Water-Worked Gravel Bed: State-of-the-Art Review
Water-Worked Gravel Bed: State-of-the-Art Review Open
In a natural gravel-bed stream, the bed that has an organized roughness structure created by the streamflow is called the water-worked gravel bed (WGB). Such a bed is entirely different from that created in a laboratory by depositing and s…
View article: Experimental and Numerical Study of Free-Surface Flows in a Corrugated Pipe
Experimental and Numerical Study of Free-Surface Flows in a Corrugated Pipe Open
A new discharge computational model is proposed on the basis of the integration of the velocity profile across the flow cross-section in an internally corrugated pipe flowing partially full. The model takes into account the velocity profil…
View article: Effect of the Junction Angle on Turbulent Flow at a Hydraulic Confluence
Effect of the Junction Angle on Turbulent Flow at a Hydraulic Confluence Open
Despite the existing knowledge concerning the hydrodynamic processes at river junctions, there is still a lack of information regarding the particular case of low width and discharge ratios, which are the typical conditions of mountain riv…
View article: Viscosity effects on local scour around vertical structures in clear-water conditions
Viscosity effects on local scour around vertical structures in clear-water conditions Open
Local scour represents the erosion process that occurs at the base of hydraulic structures overlying sediment beds. Horseshoe vortices forming at the bed-structure junction are the main responsible for sediment removal and dictate erosion …
View article: Turbulent kinetic energy flux and budget in a water-worked gravel bed
Turbulent kinetic energy flux and budget in a water-worked gravel bed Open
Turbulent flow over a water-worked gravel bed (WGB) was investigated using the double-averaging methodology (DAM). The flow measurements were carried out by the particle image velocimetry (PIV) technique. The double-averaged (DA) turbulent…
View article: Modified Einstein Sediment Transport Method to Simulate the Local Scour Evolution Downstream of a Rigid Bed
Modified Einstein Sediment Transport Method to Simulate the Local Scour Evolution Downstream of a Rigid Bed Open
The present study consists of a new mathematical-numerical modeling formulation to simulate the spatial and temporal scour
\ndevelopment downstream of a rigid bed for both a noncohesive sediment bed and a cohesive sediment mixture with rel…