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. Join us here!
Program (Spring 2023):
Thursday, 23 March 2023 at 16:00 CET
Wolfgang Schwanghart (University of Potsdam)
Registration link: https://durhamuniversity.zoom.us/meeting/register/tJwqfu2rpj4iGtUvHDtps9cH8O7Dp0nmLXqQ
Trouble with transience - the (shared) stream power model in rejuvenating landscapes
The stream power model is commonly used in landscape evolution models and fundamental for us to infer tectonics from topography. In this talk, I'll demonstrate that the two main applications of the stream power incision model - modelling longitudinal river profiles and response times to perturbations - are difficult to reconcile. Parameters derived from longitudinal river profiles do not explain the pace of upstream propagation of knickpoints, and vice versa. The recently introduced shared stream power model consolidates these issues, but has a major consequence: We vastly underestimate the role of sediment transport in shaping river longitudinal profiles.
Thursday, 30 March 2023 at 16:00 CEST
Erin Seagren (Simon Fraser University)
Fluvial erosion, drainage reorganization, and the evolution of the Puna Plateau
Understanding the full response of drainage systems to changes in tectonics and climate is key for using rivers to ‘read’ the history of landscapes. Though classically studied in profile, the planform patterns of rivers also record boundary condition changes and reorganization of these patterns may influence landscape form. However, it is less clear how controls of planform drainage patterns translate to landscape evolution and the space and timescales that planform patterns integrate. Given large climate and base level gradients across their margins, orogenic plateaus are especially susceptible to topographic changes following drainage reorganization and are an ideal natural laboratory to investigate how planform river patterns record tectonics and climate.
Using terrestrial cosmogenic nuclides (TCN), geomorphic, structural, and existing thermochronologic evidence, I examine the patterns and controls of fluvial erosion rates – the ultimate driver of drainage reorganization – and planform drainage patterns at the Puna Plateau margin in NW Argentina. While TCN-based fluvial erosion rates are linked to the spatial variability of vegetation within a catchment, broader scale drainage patterns and reorganization appear unrelated to climate. Instead, I find drainage patterns across the plateau margin and foreland are linked to tectonically-set base level differences and the structural setting of the region. This broad tectonic control results in the general stability of the plateau margin and long-lived structure-parallel drainages in the foreland. Planform drainage patterns can be used to discriminate tectonic and climatic controls of landscape evolution, though the appropriate time and spatial scales need careful consideration.
Thursday, 4 May 2023 at 16:00 CEST
Isaac Larsen (University of Massachusetts, Amherst)
Thursday, 11 May 2023 at 16:00 CEST
Guillaume Jouvet (University of Laussane)
Thursday, 18 May 2023 at 16:00 CEST
Vjeran Visnjevic (University of Tuebingen)
Thursday, 25 May 2023 at 16:00 CEST
Jorge Lorenzo-trueba (Montclair State University)
Thursday, 1 June 2023 at 16:00 CEST
Duna Roda-Boluda (Vrije Universiteit Amsterdam)
Thursday, 8 June 2023 at 16:00 CEST
Gregory Ruetenik (Czech Academy of Sciences)
Thursday, 15 June 2023 at 16:00 CEST
Daniel Peifer (University of Tuebingen)
Thursday, 22 June 2023 at 16:00 CEST
Vivi K. Pedersen (Aarhus University)
Previous talks of this series:
Thursday 9th February 2023 at 16:00 CET
Taylor Schildgen (GFZ, Potsdam)
Alluvial channels: Complex conveyors of sedimentary signals from erosional sources to depositional sinks
Periodic climate change commonly leaves traces in our landscapes, such as in alluvial fan lobes, river-terrace sequences, and in geochemical and sedimentary cycles within stratigraphic sequences. Using such records to reconstruct past climate forcing commonly assumes a direct and simple link between climate forcing and the creation of these archives. However, sediment moving through alluvial channels can be temporarily stored or released as channels aggrade with sediment or cut back into their banks and bed. Because channels aggrade or incise as a function of the ratio of sediment discharge to water discharge, the same climate forcing that we aim to reconstruct from landscape archives can induce adjustments to alluvial-channel profiles that directly impact downstream propagating sedimentary signals. I will present a summary of field data collected from the Central Andes over the past decade that shows how different field sites record different periodicities in climate forcing, despite experiencing a very similar paleoclimate history. Next, I will discuss how a recently developed alluvial-channel model can explain these predictions in a general sense. Ongoing work is focused on using this model framework to predict (1) how the amplitude and lag times of sedimentary signals recorded in fan lobes, terraces, or stratigraphic sequences are affected over a wide range of parameter space, (2) how channel-network geometry may further complicate these predictions, and (3) where we might look to better test model predictions.
Thursday, 16 February 2023 at 16:00 CET
Harrison Gray (United States Geological Survey)
What fault scarps can tell us about the nature of sediment transport
Fault scarps are 1-3-meter-tall features produced from vertical tectonic motions over very short, seconds-long, timescales followed by longer timescale, up to thousands of years) sediment transport which smooths the scarp over time. These rapidly created features offer a rare opportunity to test our models of land surface evolution because they represent a sudden perturbation in which different process models produce distinct outcomes. Here, I overview our recent work on exploring models incorporating nonlocal sediment transport and a new sediment tracing method built from the physics behind luminescence dating. Results from cellular automata modeling suggest that incorporating nonlocal sediment transport can better capture the scarp topographic profile over time and show a direct connection between sedimentological facies and geomorphic process rates. Comparing the model results against the sediment tracing data reveals complex sediment transport processes beyond the model predictions, including periods of simultaneous debris and wash facies forming processes, erosion, and reworking. Ongoing and future efforts explore convolution forms of nonlocal sediment transport compared with a global compilation of scarp profiles with implications for diffusion-based models of colluvial sediment transport.
Thursday, 23 February 2023 at 16:00 CET
Ellen Wohl (Colorado State University, Florida)
Rivers of Carbon: Using River Corridor Science to Understand Carbon Dynamics
A river corridor includes the active channel(s), floodplain, and underlying hyporheic zone. Conceptualizing rivers as corridors, rather than just channels, emphasizes interactions throughout valley bottoms, as well as integrated geomorphic, hydrologic, biotic, and biogeochemical processes. This talk focuses on the dynamics of organic carbon in river corridors, with an emphasis on how specific combinations of process and form maximize organic carbon storage within spatially discrete reaches of river corridor known as beads. The talk ends by exploring the management implications of carbon dynamics in river corridors and specifically the importance of targeting river corridors as potential carbon sequestration sites.
Thursday, 2 March 2023 at 16:00 CET
Maya Stokes (Florida State University)
Geologic mechanisms of freshwater fish speciation in the southeast United States
The high biodiversity of mountain ranges across Earth suggests a link between geologic processes and biological evolution. Topographic uplift has been linked to the diversification of both terrestrial and freshwater species in many tectonically active landscapes. However, tectonically inactive mountain ranges also host exceptional levels of freshwater biodiversity. In this talk, I discuss how the erosional exhumation of ancient geologic structures has influenced landscape dynamics and driven the diversification of freshwater fish in the Appalachian Mountains. As rivers erode through layers of different kinds of rock, the spatial distribution of rocks at the surface of the landscape changes. Thus, for fish with habitat specificity linked to rock type, erosion can progressively expose either favorable or unfavorable rock types, creating either barriers or corridors. I utilize geologic and phylogenetic datasets to test these scenarios in darter species endemic to the southeast United States. The results demonstrate how erosion can drive the diversification of freshwater organisms in ancient mountain ranges long after tectonic activity ceases.
Investigation of stochastic-threshold incision models across a climatic and morphological gradient
Thursday, 9 March 2023 at 16:00 CET
Rebecca Hodge (Durham, University)
New approaches to understanding sediment transport and flow in rivers
Predicting rates of sediment transport and flow in rivers are long established problems in geomorphology. However, the complexities of the interactions between channel morphology, flow and sediment transport mean that our predictions still contain a considerable degree of uncertainty. In this talk I will outline how we have used novel approaches to measure and model fluvial systems in order to get new insights into flow and sediment transport processes. These approaches include using 3D printing to take rivers into the laboratory, using CT scanning to quantify the 3D structure of gravel beds, and using audio recordings to measure flow depths. I will also consider how these approaches could be developed in the future.
Thursday, 16 March 2023 at 16:00 CET
Cai Ladd (University of Glasgow)
Identifying suitable sites for mangrove restoration using the low-cost, self-assembled, and open-source ‘Mini Buoy’ hydrology sensor
Despite decades of research citing inappropriate hydrological regimes as a leading cause for long-term mangrove restoration planting failure, monitoring of potential restoration sites is still rarely done by practitioners. Here we show how the ‘Mini Buoy’, a low-cost sensor with associated open-source App, can be used to assess the suitability of areas for mangrove restoration or planting, potentially increasing the probability of success. The Mini Buoy contains an acceleration data logger to monitor inundation duration and frequency, current velocity, and wave orbital velocity at 1-minute resolution for up to six months. The material to assemble and operate Mini Buoys is globally available, and a handbook and online App allow users to easily assemble and analyse data themselves. Drawing on data from mangroves across Asia (Indonesia, Vietnam, and India) and from analogue saltmarshes in Scotland, we demonstrate how Mini Buoys were used to identify tipping points between lateral expansion and erosion of intertidal wetlands. Comparing hydrology at a site earmarked for restoration against reference conditions where mangroves are expanding can identify whether restoration planting is likely to succeed. Our ambition is to build a network of Mini Buoy users around the globe, to better understand the conditions necessary for long-term restoration success.
Taylor Schildgen (GFZ, Potsdam)
"Alluvial channels: Complex conveyors of sedimentary signals from erosional sources to depositional sinks"
Clément Désormeaux (Aix-Marseille University / 17 November 2022)
"Investigation of stochastic-threshold incision models across a climatic and morphological gradient"
Laure Guerit (CNRS and University of Rennes / 10 November 2022)
"Grain size, fractures and erosion rates"
Nathan Brown (University of Texas, Arlington / 03 November 2022)
"Resolving surficial processes using luminescence thermochronology"
David Montgomery (University of Washington, Seattle / 27 October 2022)
"The geomorphology of farming and health — how soil health connects to human health"
Steffi Tofelde (University of Potsdam / 20 October 2022)
"What sets the width of valley floors?"
Gino de Gelder (University of Grenoble / 06 October 2022)
"Inverting marine terrace morphology to constrain paleo sea-level"
Kristen Cook (GFZ Potsdam / 29 September 2022)
"Meet the next EGU-GM President and some extreme bedrock river science"
Sonia Silvestri (University of Bologna / 22 September 2022)
"Remote sensing and ecogeomorphology of coastal systems: difficulties and merits of being constantly at the edge of disciplines"
Sabin Zahirovic & Tristan Salles (University of Sydney / 16 June 2022)
"Importance of landscape dynamics on long-term sedimentation rates: a global scale perspective "
Phaedra Upton (GNS Science Dunedin / 16 June 2022)
"The Marlborough Fault System: a complex transition zone in central New Zealand illuminated by inherited structural and topographic anisotropy "
Anthony Dosseto (University of Wollongong / 16 June 2022)
"Rain, trees and erosion – new insights on old ideas"
Anne Guyez (GET Toulouse/ 16 June 2022)
"How it glows tells how it flows: insights on sediment transfer in braided river from feldspar single-grain luminescence pIRIR analysis in (Rakaia and Waimakariri braided rivers, Aotearoa, New Zealand) and numerical simulations"
Helen Dow (maiden name: Beeson) (ETH Zurich / 09 June 2022)
"Identifying causal links between tectonic processes and biodiversity in an orogenic wedge setting with a coupled landscape-biodiversity evolution model"
Eric Deal (ETH Zurich / 02 June 2022)
"Self formed channels with emergent channel width and sediment transport"
Oliver Korup (University of Potsdam / 19 May 2022)
"Mountainfall - Learning more about large landslides"
Pedro Val (Federal University of Ouro Preto / 12 May 2022)
"Widespread topographic transience in intraplate settings: it's "just" a lithologic effect"
Odin Marc (CNRS/GET Toulouse / 07 April 2022)
"What do we need to better constrain spatial and temporal occurrence of rainfall induced landslides"
Brent Goehring (Tulane University / 24 March 2022)
"Doing more with less: learning about processes from failures in beryllium-10 and carbon-14 surface exposure dating chronologies"
Ann Rowan (University of Sheffield / 17 March 2022)
"Rethinking ice-marginal moraines as a record of terrestrial paleoclimate change"
Charlotte Prud'homme (University of Lausanne / 10 March 2022)
"Long-term climate change in continental environments: An approach combining geochemistry and dating of continental carbonates"
Guy Paxman (Lamont-Doherty Earth Observatory / 03 March 2022)
"Subglacial landscapes in Greenland: Obscure(d) insights into past climates, environments, and ice sheets"
John Jansen (Czech Academy of Sciences / 24 February 2022)
"Geomorphic legacy of a fast-moving plate"
Leif Anderson (University of Utah / 17 February 2022)
"Making sense of chaos: debris-covered glacier landscapes in the face of climate change"
Sébastien Carretier (IRD and University of Toulouse / 02 December 2021)
"How can the movement of grains be linked to geomorphological transport laws (on long time scales)? "
Anne Bernhardt (Freie Universität Berlin / 25 November 2021)
"How fast are environmental signals recorded & for how long? Landscape response decoded from marine sediments"
Dirk Scherler (GFZ Postdam / 18 November 2021)
"Eroding the Garhwal Himalaya – deciphering climatic and tectonic controls with cosmogenic nuclides"
Katherine Huntington (University of Washington / 04 November 2021)
"Megamountains, megarivers, and megafloods: interactions of Earth surface processes & tectonics in the Eastern Himalaya How can the movement of grains be linked to geomorphological transport laws (on long time scales)?"
Sara Savi (University of Potsdam / 28 October 2021)
"Effects of climate warming on slope instability and debris flow activity in high mountain regions"
Abigail Langston (Kansas State University / 21 October 2021)
"Beyond lithologic control of bedrock valley width: Characterizing the role of persistent valley cover in bedrock valley width development with examples from the field and the flume"
Cristián Escauriaza (Pontificia Universidad Catolica de Chile / 07 October 2021)
"Simulations of Antidunes in Supercritical Flow"
Andrew Christ (University of Vermont / 30 September 2021)
"Camp Century revisited: an ecosystem under the ice reveals Greenland’s warmer past"
Doug Jerolmack (University of Pennsylvania / 23 September 2021)
"Landscapes of glass"
Sean Willett (ETH Zurich / 16 September 2021)
"Nature’s Other Great Experiment in Landscape Evolution "
Anne Voigtländer (GFZ Potsdam / 25 June 2021)
"Optimal stress states for geomorphologists"
Laura Quick (University of Edinburgh / 17 June 2021)
"Production and dispersal of coarse sediment across the Indo-Gangetic Plains"
Jane L. Andersen (Aarhus University / 10 June 2021)
"Exploring erosion patterns beneath high-latitude ice sheets – case studies from Scandinavia and Greenland"
Giulia Sofia (University of Connecticut / 3 June 2021)
"Digital Analysis and Terrain Mapping. The way forward in geomorphology"
Seulgi Moon (University of California Los Angeles / 27 May 2021)
"Topographic stress influence on fractures, surface processes, and landscape evolution"
Tamara Pico (University of California Santa Cruz / 20 May 2021)
"In and out of the last ice age: Insights into the influence of glacial isostatic adjustment on landscape evolution in North America"
Benjamin Keisling (Lamont-Doherty Earth Observatory / 13 May 2021)
"Past as prologue: how archives help us predict the fate of Earth’s ice sheets and the future of our discipline"
Kelin Whipple (Arizona State University / 6 May 2021)
"Quantifying the Role of Climate in Landscape Evolution"
Simon Mudd (University of Edinburgh / 25 March 2021)
"If you don’t like the stream power law, wait until you get a load of what we do on hillslopes"
Roman DiBiase (PennState University / 18 March 2021)
"Morphodynamics of mixed soil-mantled and bare bedrock hillslopes"
Ajay Limaye (University of Virginia / 11 March 2021)
"Origin and evolution of river forms"
Karl Lang (Georgia Institute of Technology / 4 March 2021)
"Linking orogeny and orography in the Southern Alps of New Zealand"
Allison Pfeiffer (Western Washington University / 25 February 2021)
"Sediment supply controls river bed (in)stability in the Pacific Northwest"
Edwin Baynes (Loughborough University / 18 February 2021)
"Hard vs Soft: spatial variability in bedrock channel geometry driven by sediment availability"
Heather Viles (University of Oxford / 11 February 2021)
"Linking life and landscape: monitoring, mapping and modelling in biogeomorphology"
Gabor Domokos (Budapest University of Technology / 26 November 2020)
"Estimating mass loss from pebble shape"
Alison Duvall (University of Washington / 19 November 2020)
"Exploring the timing, triggering and spatial distribution of landslides along the Cascadia Subduction Zone"
Alex Whittaker & Mikael Attal (Imperial College London & University of Edinburgh / 12 November 2020)
"Faulting and landscapes - a tribute to Patience Cowie"
Joanmarie del Vecchio (Penn State University / 5 November 2020)
"Appalachian pasts, Arctic futures: permafrost landscape dynamics"
Susan Conway (CNRS Nantes / 8 October 2020)
"Sublimation as a geomorphic process on Mars"
Michele Koppes (University of British Columbia / 1 October 2020)
"Reading the story of climate change in the landscape: Sedimentary signatures of disappearing glaciers"
Jean Braun (GFZ Potsdam / 24 September 2020)
"Flow of southeastern Tibet across a steady-state topography"
John Armitage (IFPEN Paris / 17 September 2020)
The presentation can be found here
Georgie Bennett (University of Exeter / 2 July 2020)
"Hazardous landscapes: Towards landslide early warning in Nepal and the Philippines"
Fiona Clubb (Durham University / 25 June 2020)
"Creepy landscapes along the San Andreas fault"
Robert Hilton (Durham University / 18 June 2020)
"The shifting view of how mountain building and erosion impact the carbon cycle"
Liran Goren (Ben Gurion University of the Negev / 11 June 2020)
Anneleen Geurts (University of Bergen / 4 June 2020)
"Drainage integration in continental rifts"
was launched by Philippe Steer, Steffi Toffelde, Vivi Pedersen, Pierre Valla, Charles Shobe and Wolfgang Schwanghart during the Covid-19 epidemic
day Month 2023 - FirstName Surname (Affiliation) "Title"
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