Our next PhDTalks Seminar will be held on tuesday 19^th march in Fassò Room (Building 4A), from 5:15 pm to 6:30 pm CET. 

PhDTalks is a series of seminars and discussions between PhD students. The events are aimed at providing a place to network and get in contact with many of the projects developed in our department. 

Speaker Hasan Eslami will talk about “Investigation of channel aggradation due to sediment overloading”. 

At the end of each event a small refreshment funded by the department will be available. 

You can watch the event online by clicking here.

Abstract

When a channel is overloaded with sediment, an aggradation wave propagates with a certain celerity along the reach. Estimation of the local aggradation depth and of the celerity of propagation are important for hazard assessment and emergency planning. In the current project the aggradation process is studied using a variety of approaches to meet different objectives. First, the celerity of propagation of aggradation wave is investigated by performing an appropriate experimental campaign. Furthermore, considering that morphological processes are modeled by differential equations, the eigenvalues of the latter’s system represent the celerity of propagation of small perturbations. With reference to the laboratory experiments with temporally and spatially detailed measurements, our investigation shows how the celerity of propagation of aggradation wave and the eigenvalues correlate with one another, while their values differ by orders of magnitude. Second, the aggradation process studied experimentally are reproduced with corresponding numerical simulations in one-dimensional conditions, demonstrating that the presence of sediment transport in a flow may result in an increase in the equivalent Manning’s coefficient. Third, the aggradation process is also simulated using a linear diffusion equation. In this context, an analytical solution for the diffusion equation is employed in the performed aggradation experiments, revealing that a constant value for the diffusion coefficient is enough to reproduce the bed evolution within an experiment.

Speaker’s bio

Hasan completed his master’s degree in “Civil Engineering for Risk Mitigation” at Politecnico di Milano in 2021. He is currently pursuing his PhD program (37th cycle) at the Department of Civil and Environmental Engineering at Politecnico di Milano. His research focuses on the ” Investigation of channel aggradation due to sediment overloading.” In his leisure hours, Hasan enjoys traveling and listening to music.