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SUMMARY:EESS talk on "Geophysics in environmental science and engineering"
DTSTART:20210420T121500
DTEND:20210420T130000
DTSTAMP:20260916T054231Z
UID:1f1e8c9442e2cd09836468ff881f5d31534a666cc8020d8f764cec97
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Niklas Linde\, Professor\, Institute of Earth Sciences (IST
 E)\, Faculty of Geosciences and Environment\, UNIL\nAbstract:\nGeophysics 
 offers remotely sensed (from the Earth’s surface\, boreholes\, space etc
 .) information on the Earth’s physical properties (electric\, dielectric
 \, magnetic\, density\, mechanical etc.) at depth scales ranging from cent
 imeters to hundreds of kilometers and at similarly variable lateral scales
 . For a given environmental setting\, the success of geophysics hinges on 
 (1) the properties\, processes or predictions of interest\, as well as on 
 their spatial and temporal scales\, resolution needs and prior knowledge\;
  (2) to what extent geophysically-sensed properties can be linked to the f
 ormer\; (3) the resolving power of the geophysical method(s) and the exper
 imental design\; (4) data quality and accuracy of the (numerical) forward 
 models used to link geophysical properties and observables and (5) computi
 ng resources. These aspects need to be formalized and integrated to avoid 
 random success stories and failures resulting in over-confidence and decep
 tion\, respectively. Bayesian statistics offers a suitable framework to ac
 hieve realistic expectations and proper uncertainty quantification. Relyin
 g on advances in mathematical statistics and deep learning\, I use hydroge
 ophysical examples to showcase the strengths of such a Bayesian approach\,
  the main obstacles and future directions. Since one person or research gr
 oup is unlikely to possess all the necessary knowledge and skills\, I argu
 e that successful quantitative use of geophysics for environmental applica
 tions is best achieved by close collaborations among environmental scienti
 sts and engineers\, geophysicists and statisticians.\n\nShort biography:\n
 Niklas Linde is a professor of environmental geophysics at the University 
 of Lausanne (UNIL). He studied environmental engineering at Uppsala Univer
 sity before completing a PhD in Solid Earth Geophysics at Uppsala Universi
 ty in 2005. During his PhD\, he spent one year at Lawrence Berkeley Nation
 al University\, California. After a one-year post-doc at Aix-Marseille Uni
 versity in Aix-en-Provence and a two-year postdoc at ETHZ\, he joined the 
 faculty at UNIL. His main research interests revolve around integration of
  geophysical data in hydrology\, inverse theory\, uncertainty quantificati
 on and Bayesian model selection with environmental applications.\n 
LOCATION:ZOOM https://epfl.zoom.us/j/84677261593
STATUS:CONFIRMED
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