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Landscapes Live

EGU-GM Online Seminars in Geomorphology

Landscapes Live is a weekly online seminar series freely accessible to the international scientific community interested in various aspects of geomorphology. Our talks take place on Zoom every Thursday, starting at 4pm time of Paris/Berlin/Amsterdam. Check your local time here.

Landscapes Live is affiliated to the Geomorphology (GM) division of EGU and contribute to develop its virtual activities. Indeed, EGU is pioneering a new CampFire concept to bring together the geoscience community in between General Assemblies. We hope that this will meet the needs of the current pandemic but also help us in our transition to a greener future and ensure that our community better serve the needs of all scientists regardless of international mobility. 

We are expanding the options to interact with the LL speakers during and after their talks by opening dedicated channels on the new Landscapes Live discord server. 

Program (Spring 2024): 

Upcoming talks.....

Thursday, 6 June 2024 at 16:00 CEST

Nakul Deshpande (NC State University, USA)

Registration Link: https://gfz-potsdam-de.zoom-x.de/meeting/register/u5crd-CsqTIrHNaPbJ_unqpaeRgb8VpaaT0b 

The Perpetual Fragility of Creeping Hillslopes

Abstract: Pour sand on a table. What happens? At first blush, not much. Grains fall and form a pile. When pouring stops, it all rests at the angle of repose. To our eyes, this sandpile is frozen, immobile: jammed. It turns out that, if viewed with the help of sensitive laser interference, this pile is anything but immobile. It creeps incessantly for 11 days (the longest we can practically measure), albeit at a rate that decreases ever so slowly. Creep manifests spatially as discrete zones of deformation that flicker in and out of existence; the view is reminiscent of corn popping on a stove. Disturbing the sandpile adds new phenomenology. Heat the pile and creep rates increase. Intrinsic relaxation reverses and creep is rejuvenated. If instead the sandpile is tapped, it compacts, and creep slows even further: the pile ages.

Soils in nature likewise creep and blanket terrestrial hillslopes. Sand and soil share fundamental elements: a disordered structure, an absence of thermal agitations, and the relentless pull of gravity: both are granular materials. Although it may seem disconnected from the ‘reality’ of the field, the sandpile is a model system to optimize observations that would otherwise be inaccessible, slow, and impractical to collect in the field. Undisturbed creep in an experimental sandpile sharply departs from existing conceptual and modeling approaches for soil deformation in nature, and in turn how landscapes evolve over geologic time. Hillsope diffusion is nowhere to be found, and no simple mapping from the laboratory to the field exists. A key observation connects both settings: the presence of exponentially-decaying velocity profiles. However, we have little idea of *why* an undisturbed sandpile creeps under gravity alone, nor do we possess a framework to account for the mechanisms by which disturbances modulate and tune creeping motions. A path forward may be found in the relaxation of glasses and supercooled liquids — materials that exhibit behavior akin to the creeping sandpile. Many questions remain, and this work is an adventure, exploring potentialities that connect the fundamental mechanics of granular materials with the messy soils we find in nature. Contained within is the possibility to apply these mappings to other surface processes and the richness of fluid-particle mixtures that constitute our planet’s surface.

Website: https://scholar.google.com/citations?user=iy_PdWoAAAAJ&hl=en

Past speakers.....

Thursday, 28 March 2024 at 16:00 CET

Katy Burrows (ESA)

Resolving the impacts of earthquakes, storms, and prolonged rainfall on shallow landsliding 

Talk is now on LL's YouTube  channel: https://www.youtube.com/watch?v=72yxOMXzfNs

Thursday, 4 April 2024 at 16:00 CEST

Albert Cabré (GET, Geoscience Environment Toulouse, France)

Geomorphic work of recent episodic rainstorm events in arid landscapes: examples from the Atacama Desert

Talk is now on LL's YouTube  channel: https://www.youtube.com/watch?v=uKF473Pv1No

Thursday, 11 April 2024 at 16:00 CEST

Scott Jess (Washington State University, USA)

The ups and downs of extensional tectonics

Talk is now on LL's YouTube  channel: https://www.youtube.com/watch?v=SQQFXh5aYIw

Thursday, 2 May 2024 at 16:00 CEST

Danica Roth (Colorado School of Mines, USA)

Unveiling nonlocal landscape dynamics: exploring hillslope processes beyond the diffusive paradigm 

Talk is now on LL's YouTube  channel: https://www.youtube.com/watch?v=IQiKKyHaLj4

Thursday, 9 May 2024 at 16:00 CEST

Sam Woor (University of British Columbia & University of the Fraser Valley, Canada)

Illuminating landscape responses to Quaternary climate change with luminescence

Talk is now on LL's YouTube  channel: https://www.youtube.com/watch?v=pDmnPb-FiLA

Thursday, 16 May 2024 at 16:00 CEST

Virginia Ruiz-Villanueva (University of Lausanne & University of Bern, Switzerland)

Quantifying and monitoring instream large wood supply and transfer in rivers 

Talk is now on LL's YouTube  channel: https://www.youtube.com/watch?v=38oT5MwHgX4 

Thursday, 23 May 2024 at 16:00 CEST

Claire Masteller (Washington University in St. Louis, USA)

Wiggles in width:  Insights into alluvial channel dynamics from variability in high-resolution downstream hydraulic geometry

Talk is now on LL's YouTube  channel: https://www.youtube.com/watch?v=BMizP1choAE