DEL GAUDIO, ANDREA (2024) Hydrodynamics of Dam Break Waves against obstacles: Numerical and Experimental Analysis of Newtonian and Non-Newtonian Fluids. [Tesi di dottorato]

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Abstract

Dam-break waves are powerful, rapidly evolving flows triggered by the sudden release of fluid from behind a barrier. Depending on the conditions, these waves manifest as unsteady surges when traveling over dry beds or as bores when propagating over wet beds. Both forms pose significant threats to infrastructure and the environment, often resulting in extensive flooding, erosion, and severe structural damage. Dam-break waves can arise from both natural and man-induced events, such as tsunamis, f lash floods, debris and mud flows, or the failure of dams. Their behavior is governed by several variables, including turbulence instabilities, the influence of often movable beds and complex bottom topography, and interactions with physical barriers. Understanding these dynamics is crucial for effective flood management and mitigation efforts. Over the years, dam-break wave studies have been an essential focus of hydraulic engineers, given their paramount role in risk mitigation and disaster prevention. Developing a comprehensive understanding of these waves is key to safeguarding communities and infrastructure from the devastating impacts of such events. This thesis explores the hydrodynamics of dam-break waves as they propagate over both fixed and mobile beds, examining their behavior when interacting with rigid barriers. We investigate these dynamics using both Newtonian and non-Newtonian fluids, offering insights into the impact of fluid rheology on wave behavior combining both numerical models and experimental setups to validate findings and enhance the predictive capabilities of these models.

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