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Subsurface Weathering Revealed in Hillslope-Integrated Porosity Distributions

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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Submitted on : Saturday, June 25, 2022 - 7:00:09 AM
Last modification on : Saturday, June 25, 2022 - 7:00:10 AM

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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, American Geophysical Union, 2020, 47, ⟨10.1029/2020GL088322⟩. ⟨insu-03584745⟩

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