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DTSTART;TZID=Europe/Rome:20240305T171500
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UID:31589-1709658900-1709663400@www.dica.polimi.it
SUMMARY:PhDTalks | Integrating optical and radar imaging to enhance river drought monitoring
DESCRIPTION:Il prossimo appuntamento con la serie di incontri PhDTalks si terrà Martedì 5 marzo nell’aula Fassò (Edificio 4A)\, dalle 17:15 alle 18:30 CET. \nPhDTalks è una serie di seminari e discussioni tra dottorandi. Gli eventi hanno lo scopo di fornire un luogo dove creare un network tra dottorandi ed entrare in contatto con i molti progetti sviluppati nel nostro dipartimento. \nLo speaker Stefano Conversi condurrà un seminario dal titolo “Integrating optical and radar imaging to enhance river drought monitoring”.  \nAl termine dell’evento sarà disponibile un piccolo rinfresco finanziato dal dipartimento. \nSarà possibile seguire la conferenza anche online al seguente link. \nAbstract \nDrought events are growingly affecting European and Italian territories\, hampering local environments and biodiversity\, such as the ones relying on rivers for their subsistence. Monitoring of rivers is becoming an important issue to face drought crisis and may be exploited with different tools. Among the most commons\, satellite imagery is exploited to map water coverage\, basing on optical or radar sources. This work proposes a combination of the two sensors to overcome possible limitations of the single dataset exploitation\, reaching a reliable result. The methodology is applied to a stretch of Po River in Lombardy region (Italy). Through Google Earth Engine platform\, optical satellite Sentinel-2 and radar satellite Sentinel-1 data are processed. The combination of the radar data and of the optical spectral indices is carried out through a pixel-based supervised classification\, with a Random Forest classifier. Maps of water coverage are obtained\, numerical outcomes of water surface evaluation are recorded and validated by the mean of reference hydrometric data. A multitemporal analysis is then reported\, aiming to prove the efficiency of the procedure. All iterations show reliable accuracies and correlation among water surface estimation and water table measurements in two sections of interest. In perspective\, the proposed methodology will be implemented in tools for supporting drought monitoring to be integrated in environmental public administration policies. \nSpeaker’s bio \nStefano is a PhD Student in Environmental and Infrastructure Engineering\, within the Geodesy and Geomatics section. In 2021 he obtained the Master degree in Civil Engineering for Risk Mitigation at Politecnico di Milano. Currently he is part of the Innovazione project supported by Politecnico and Regione Lombardia\, for which he collaborates with the Operative Unit for management and preservation of Biodiversity.D Stefano likes to spend his free time travelling\, attending live concerts and baking.
URL:https://www.dica.polimi.it/it/evento/phdtalks-integrating-optical-and-radar-imagery-to-enhance-river-drought-monitoring/
CATEGORIES:PHD Life,Seminari e conferenze
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DTSTART;TZID=Europe/Rome:20240319T171500
DTEND;TZID=Europe/Rome:20240319T183000
DTSTAMP:20260510T031530
CREATED:20240313T093042Z
LAST-MODIFIED:20240313T093042Z
UID:31595-1710868500-1710873000@www.dica.polimi.it
SUMMARY:PhDTalks | Investigation of channel aggradation due to sediment overloading
DESCRIPTION:Il prossimo appuntamento con la serie di incontri PhDTalks si terrà Martedì 19 marzo nell’aula Fassò (Edificio 4A)\, dalle 17:15 alle 18:30 CET. \nPhDTalks è una serie di seminari e discussioni tra dottorandi. Gli eventi hanno lo scopo di fornire un luogo dove creare un network tra dottorandi ed entrare in contatto con i molteplici progetti sviluppati nel nostro dipartimento. \nLo speaker Hasan Eslami condurrà un seminario dal titolo “Investigation of channel aggradation due to sediment overloading”.  \nAl termine dell’evento sarà disponibile un piccolo rinfresco finanziato dal dipartimento. \nSarà possibile seguire la conferenza anche online al seguente link. \nAbstract \nWhen 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. \nSpeaker’s bio \nHasan 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.”\nIn his leisure hours\, Hasan enjoys traveling and listening to music.
URL:https://www.dica.polimi.it/it/evento/phdtalks-investigation-of-channel-aggradation-due-to-sediment-overloading/
CATEGORIES:PHD Life,Seminari e conferenze
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