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Journal Articles Geophysical Research Letters Year : 2020

Subsurface Weathering Revealed in Hillslope-Integrated Porosity Distributions

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1
Russell P. Callahan
  • Function : Author
Clifford S. Riebe
  • Function : Author
Ken L. Ferrier
  • Function : Author
Dario Grana
  • Function : Author
Leonard S. Sklar
  • Function : Author
Nicholas J. Taylor
  • Function : Author
Brady A. Flinchum
  • Function : Author
Jorden L. Hayes
  • Function : Author
Bradley J. Carr
  • Function : Author
Peter C. Hartsough
  • Function : Author
Anthony T. O'Geen
  • Function : Author
W. Steven Holbrook
  • Function : Author

Abstract

Subsurface weathering has traditionally been measured using cores and boreholes to quantify vertical variations in weathered material properties. However, these measurements are typically available at only a few, potentially unrepresentative points on hillslopes. Geophysical surveys, conversely, span many more points and, as shown here, can be used to obtain a representative, site-integrated perspective on subsurface weathering. Our approach aggregates data from multiple seismic refraction surveys into a single frequency distribution of porosity and depth for the surveyed area. We calibrated the porosities at a site where cores are coincident with seismic refraction surveys. Modeled porosities from the survey data match measurements at the core locations but reveal a frequency distribution of porosity and depth that differs markedly from the cores. Our results highlight the value of using the site-integrated perspective obtained from the geophysical data to quantify subsurface weathering and water-holding capacity.
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insu-03584745 , version 1 (25-06-2022)

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Russell P. Callahan, Clifford S. Riebe, Sylvain Pasquet, Ken L. Ferrier, Dario Grana, et al.. Subsurface Weathering Revealed in Hillslope-Integrated Porosity Distributions. Geophysical Research Letters, 2020, 47, ⟨10.1029/2020GL088322⟩. ⟨insu-03584745⟩
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