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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, 23 May 2024 at 16:00 CEST

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

Registration Link: https://us02web.zoom.us/meeting/register/tZApc-6qqTopGNUO6B5rsgMMPkAK67jrZ6o1 

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

Abstract: The shape of a river reflects a balance of climate, hydrology, and sediment transport. Stable channels maintain a robust scaling between bankfull discharge and width, such that in aggregate, Q ~ aW0.5. Remarkably, this discharge-width scaling is consistent across 13 orders of magnitude from laboratory channels to the largest rivers in the world and represents a morphologic signature that is anchored to the threshold for motion. Others have highlighted signals of regional variations due to climate, vegetation, lithology, and land use around this scaling. However, individual rivers are often reduced to one or a few data points, relegating these factors to a fitting coefficient (a). In this contribution, we quantify the degree to which high-resolution variations in bankfull channel width deviate from this robust discharge-width scaling. We propose that these site-specific deviations can provide insights into alluvial channel dynamics and stability at the reach scale.

To constrain site-specific variability in channel width, we developed an automated cross section extraction algorithm where bankfull channel widths are identified from high-resolution topography. We extract bankfull channel width at 1-10 m intervals along the entire length of coarse-grained rivers with variable hydroclimates, drainage areas, and slopes. Topographically extracted channel widths largely follow discharge-width scaling, but the degree of width variability at each site rivals and in some instances exceeds the global variability for a given discharge. The observed variability indicates that while the global data are useful for discerning a governing trend, there is considerably more information on the structure and function of the river corridor encoded within hydraulic geometry. We suggest that the degree of width variability exhibited in each test case encodes information related to variations in particle entrainment thresholds, which themselves may vary based on local slope or hydroclimatic variability. We propose that high-resolution downstream hydraulic geometry may also be used to assess the relative resilience of individual watersheds to shifting climate or discrete perturbations. 

Website: https://eeps.wustl.edu/people/claire-masteller

Thursday, 6 June 2024 at 16:00 CEST

Nakul Deshpande (NC State University, USA)

Title TBA

Abstract: TBA

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