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 helps us in our transition to a greener future and ensure that our community better serve the needs of all scientists regardless of international mobility.
The lack of soil on some hillslopes, such as in badland topography, requires a mismatch in the rates of soil production and soil erosion today or in the past. Soil blanketing most of Earth attests to the likelihood of some balancing mechanism between soil production and erosion. However, it seems possible - even probable - that rapidly changing natural environments and land and water use amplification by humans might tip landscapes across a threshold where soil replenishment is not the norm. If we find ourselves in such a time today or in the future, how can cosmogenic nuclides that often rely on steady-state assumptions still help Earth scientists quantify earth-surface change? What clues would cosmogenic nuclides and soil chemistry provide that might indicate what kinds of thresholds have been crossed?
Zoom link for registration: https://cuboulder.zoom.us/meeting/register/Sq6Km1gtQVac_bPHqnZ6fw#/registration
The relationship between channel morphology and bedrock stream incision is influenced by many factors, including climate, lithology, sediment flux, and fluvial thresholds. These factors have been encoded in landscape evolution models for tectonically active landscapes; however, in uplifting landscapes the influence of sediment flux and fluvial thresholds are difficult to isolate. In this talk, I will discuss a project on the Hawaiian Islands, a natural laboratory with known initial conditions, fairly uniform lithology, strong climatic gradients, and limited tectonic effects well suited to studying the role of sediment flux and fluvial thresholds in landscape evolution. On Kauai, long term average volumetric erosion is correlated with precipitation, but river incision has varied through time. Lava flows inset deep within Kauai’s canyons show that river incision has been negligible for the last 2 Ma – why did the streams stop incising? We hypothesize that these rivers lack the stream power to incise bedrock, and that channel slopes are at a critical threshold set by climate, fluvial thresholds, and sediment flux. To test our hypothesis, we surveyed channels in canyons across the climate gradient on Kauai and West Maui and collected samples for cosmogenic erosion rates and an extensive grain size dataset. Boulder size and immobile boulder cover are significantly correlated with local channel steepness, 25-year floods move the median-sized grains, and 100-year floods move most large boulders (D84s). On the other hand, erosion rates (a proxy for sediment flux) are not significantly correlated with transport stage or normalized channel steepness. We propose that in Hawaiian streams, slope is mainly set by the threshold of motion of the large-boulder fraction met only in extreme events, and that the lack of tectonic uplift on the Hawaiian Islands leads to a complex relationship between erosion rate, time, channel steepness, and erodibility, where over time, rainier catchments erode to a lower slope and eventually achieve a similar erosion rate as drier, less erodible catchments.
Zoom link for registration: https://cuboulder.zoom.us/meeting/register/Sq6Km1gtQVac_bPHqnZ6fw#/registration
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Sediment Transport and Flood Risk in Mountain Rivers
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Forest-landscape dynamics: Terrestrial Laser Scanning connects forest structure and landscape form in three dimensions
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Cancelled
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Resolving the impacts of earthquakes, storms, and prolonged rainfall on shallow landsliding
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Wiggles in width: Insights into alluvial channel dynamics from variability in high-resolution downstream hydraulic geometry
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