EGU22-9090
https://doi.org/10.5194/egusphere-egu22-9090
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Hillslope response to oscillating forcing

Vincent Godard1,2 and Gregory Tucker3,4
Vincent Godard and Gregory Tucker
  • 1Aix-Marseille Université, OSU-Pythéas, CEREGE, Aix-en-Provence, France (godard@cerege.fr)
  • 2Institut Universitaire de France (IUF), 75231, Paris, France
  • 3Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO, USA
  • 4Department of Geological Sciences, University of Colorado, Boulder, CO, USA

Assessing rivers' and hillslopes' sensitivity to external forcing is paramount to understand landscape evolution, in particular as a response to Quaternary climate changes. River networks are usually considered to be the main conveyors of environmental signals, such as changes in precipitation, temperature, or baselevel. Yet because hillslopes provide the source of sediment for river networks, their response to environmental change  also  modulate landscape dynamics. In order to characterize such  behavior we analyse the response times of a transport-limited hillslope.
We use simple numerical models of denudation to study hillslope responses to oscillatory forcing and understand their filtering effects on  environmental signals. Modifications in the frequency of climate oscillation, such as the change that occurred at the Mid-Pleistocene Transition, can significantly modulate hillslope sediment-flux response. We infer a wide range of hillslope responses, ranging from negligible change over the full range of climate-forcing frequencies, to a significant filtering of long-period signals. 

How to cite: Godard, V. and Tucker, G.: Hillslope response to oscillating forcing, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-9090, https://doi.org/10.5194/egusphere-egu22-9090, 2022.

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