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DTSTART;TZID=Europe/Rome:20260625T103000
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SUMMARY:The vadose zone: a multifaceted perspective
DESCRIPTION:On Thursday\, June 25\, two seminars will be held in Grandori Room (Building 4) at 10:30 CET.\n\nThe first seminar will be given by Anna Dabudyk\, ITES Strasbourg Institute of Earth and Environment\, and is titled: Optimization of Monte Carlo simulations for physically-based groundwater recharge modelling: convergence\, sensitivity analysis and spatial upscaling.\n\nIt will also be possible to follow them online at the following link: https://politecnicomilano.webex.com/meet/aronne.delloca\n\nAbstract\nPhysically-based integrated hydrological models have become essential tools to inform quantitative management at the catchment scale. Recharge is a key process that is either computed internally or computed externally and then read as an input. In both cases\, a high level of uncertainty is expected as no real measurement of recharge are available.\nIn this work\, we use a chain of physically-based models comprising a Land Surface Model for groundwater recharge and a hydrological model that couples surface and subsurface flow processes. The main goal is to assess the impact of anthropogenic withdrawals on low flows and provide a rigorous quantification of uncertainties for both piezometric level and surface discharge.\nComputing groundwater recharge using a physically-based LSM model is a rather parameter intensive approach. To quantify the uncertainties\, this model uses a Monte Carlo framework to randomly sample 178 parameters per simulation. We first established that a minimum of 3\,000 simulations was required for convergence. Next\, we conducted a sensitivity analysis which revealed that uncertainties related to parameters are more significant than those related to meteorological forcing.\nOur next step is to focus on model efficiency. Using clustering methods\, we intent to select relevant pixels to compute groundwater recharge before upscaling to the entire catchment. This is a critical step\, as the groundwater recharge is then used as input data for the hydrological model\, for which computation times are significantly more challenging.\n\nBio-sketch \nAnna Dabudyk is a PhD student in hydrology at ITES (Strasbourg Institute of Earth and Environment). Her research focuses on catchment-scale quantitative hydrology\, using numerical modelling and statistical approaches to evaluate simulation reliability and quantify uncertainty. The main goal of her work is to understand the relationship between anthropogenic withdrawals and surface and groundwater water dynamics. Her work aims to bridge the gap between complex hydrological modelling and practical decision-making by providing uncertainty-aware numerical solutions for water management. \n\nThe second seminar will be given by Tomás Aquino\, IDAEA Spanish National Research Council institute\, Barcelona\, and is titled: From geometry to velocity: How medium structure and water saturation shape global flow statistics.\n \n\nAbstract\nSubsurface flows exhibit rich structure across multiple scales due to complex medium geometry. In the vadose zone\, i.e.\, the partially-saturated region that acts as a reactive filter for nutrients and contaminants\, flow heterogeneity is further enhanced by the simultaneous presence of air and water. Understanding\, quantifying\, and predicting transport and reaction in such systems requires models that can be parameterized based on incomplete information about the pore-scale structure and saturation\, which are typically known only to a limited extent.\nOver the last few decades\, stochastic models have gained in popularity as useful and elegant tools to fill this role. In addition to the classical inverse problem\, where Monte Carlo type methods are traditionally employed to quantify uncertainty\, recent stochastic transport and mixing models rely on statistical descriptions of the underlying flow field to make deterministic predictions of macroscopic quantities\, such as breakthrough curves and dispersion\, at larger scales. These methods typically rely on the probability of finding a certain velocity value anywhere in the domain together with a characteristic correlation length\, without need for detailed knowledge of the spatial structure. Despite their success\, the predictive power of such models remains limited by our inability to connect the statistics of geometric features\, such as pore throat widths\, to flow statistics. Indeed\, current mean field theories fail to capture the flow statistics even in simple disordered media.\nIn the first part of this talk\, I will discuss a new theory of flow statistics for saturated\, disordered media\, which employs a pore network description to connect flow distributions to macroscopic metrics like the porosity and the coeMicient of variation of pore throat widths. I will show that this theory performs very well for simple model porous media in two dimensions\, composed of disordered arrays of circular obstacles. In the second part of the talk\, I will discuss how flow statistics models can be extended to partially saturated conditions.\n\nBio-sketch\nTomás Aquino is a Researcher at the IDAEA\, a Spanish National Research Council institute in Barcelona dedicated to environmental sciences. He obtained his undergraduate and MSc degrees in Physics from the University of Lisbon\, Portugal\, where he is originally from\, and his PhD from the University of Notre Dame\, IN\, USA. He is the recipient of the ongoing ERC Starting Grant Uplift\, which is dedicated to advancing our understanding of flow\, transport\, mixing and reaction in partially saturated porous media across scales.
URL:https://www.dica.polimi.it/it/evento/the-vadose-zone-a-multifaceted-perspective/
LOCATION:aula Grandori (ed.4)
CATEGORIES:Seminari e conferenze
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DTSTART;TZID=Europe/Rome:20260625T133000
DTEND;TZID=Europe/Rome:20260626T183000
DTSTAMP:20260616T095744Z
CREATED:20260616T095404Z
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UID:33446-1782394200-1782498600@www.dica.polimi.it
SUMMARY:XV Incontro dei Giovani Ingegneri Geotecnici
DESCRIPTION:Il 25 e 26 giugno 2026 il Politecnico di Milano ospiterà il XV Incontro dei Giovani Ingegneri Geotecnici (IAGIG)\, organizzato dall’Associazione Geotecnica Italiana (AGI) in collaborazione con il Dipartimento di Ingegneria Civile e Ambientale. L’iniziativa rappresenta un consolidato momento di confronto\, condivisione e crescita professionale rivolto a giovani ingegneri\, ricercatori e professionisti del settore della geotecnica.\n\nLa partecipazione è gratuita\, senza quote di iscrizione né costi per la pubblicazione degli atti. L’iscrizione è tuttavia obbligatoria\, poiché l’accesso sarà consentito fino a esaurimento dei posti disponibili in aula\, ed è possibile effettuarla al seguente link. Il Consiglio Nazionale degli Ingegneri riconosce 6 CFP per la partecipazione in presenza.\n\nMaggiori informazioni sono disponibili sul sito dell’evento.\n\nProgramma delle giornate e locandina. 
URL:https://www.dica.polimi.it/it/evento/xv-incontro-dei-giovani-ingegneri-geotecnici/
LOCATION:aula De Donato (edificio 3)
CATEGORIES:Seminari e conferenze
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DTSTART;TZID=Europe/Rome:20260625T140000
DTEND;TZID=Europe/Rome:20260625T160000
DTSTAMP:20260619T080307Z
CREATED:20260619T080307Z
LAST-MODIFIED:20260619T080307Z
UID:33475-1782396000-1782403200@www.dica.polimi.it
SUMMARY:Active dynamics of epithelial tissues
DESCRIPTION:On Thursday\, June 25\, a seminar titled “Active dynamics of epithelial tissues” will be held in Grandori Room (Building 4) at 14:00 CET. \nThe seminar will be given by Prof. Alexandre Kabla\, University of Cambridge. \nAbstract \nEpithelial tissues play a crucial role during embryonic development and in adult organisms\, forming essential physiological barriers within the body. These tissues frequently undergo and even instigate significant deformations while maintaining mechanical integrity. This presentation examines the autonomous force-generating behaviours of epithelial tissues and their mechanical consequences\, emphasizing theoretical and computational modelling strategies. Experimental investigations of in vitro MDCK cell monolayers reveal spontaneous contractility that generates tissue-scale tension and induces curling at free edges\, behaviours absent in isolated cells but emergent at the collective level. Epithelial tissues also continuously remodel through cell neighbour exchanges\, particularly during embryonic morphogenesis when coordinated cell rearrangements drive large-scale tissue flows. The interplay between active force generation and passive mechanical response determines the rate and spatial organization of these processes. Through modelling\, we investigate how individual cell rheology\, active contractility\, and mechanical coupling give rise to tissue-scale behaviours. Our findings reveal that mechanical coupling amplifies both internal and external mechanical signals\, creating sensitivity to stress states and boundary conditions that cannot be predicted from single-cell properties alone. \nBio-sketch \nProfessor Alexandre is a professor of mechanobiology in the Engineering Department. He trained as a physicist and computer scientist. His early research focused on the mechanics of sandcastles and liquid foams. He then progressively drifted towards fibrous materials\, and later to biological tissues and cell mechanics in general. \nHis group’s research focuses on the mechanobiology of tissues. They use numerical and analytical modelling\, as well as experimentation\, to study how cell assemblies respond to forces and control their mechanical properties\, as well as how active processes such as cell migration lead to tissue morphogenesis. \nHis research is collaborative and interdisciplinary. From a technical perspective\, the group has expertise in soft matter physics\, rheology\, mechanical characterisation of materials\, microfluidics\, and scientific software engineering. \n 
URL:https://www.dica.polimi.it/it/evento/active-dynamics-of-epithelial-tissues/
LOCATION:aula Grandori (ed.4)
CATEGORIES:Seminari e conferenze
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