The illusion of diffusion: Field evidence for depth-dependent sediment transport

Arjun M. Heimsath, David Jon Furbish, William E. Dietrich

Research output: Contribution to journalArticlepeer-review

130 Scopus citations

Abstract

Soil-covered upland landscapes are common in much of the habitable world, and our understanding of their evolution as a function of different climatic, tectonic, and geologic regimes is important across a wide range of disciplines. Erosion laws direct quantitative study of the processes shaping Earth's surface and form the basis of landscape evolution modeling, but are based on limited field data. Here we use in situ-produced cosmogenic 10Be and 26Al concentrations from granitic saprolite to quantify an exponential decline in soil production with increasing soil thickness for a new field site in Point Reyes, California. Results are similar to soil production functions from two different, previously studied field sites, and are used with extensive measurements of soil thickness to quantify depth-integrated sediment transport flux. Plots of calculated sediment fluxes against the product of soil depth and hillslope gradient provide the first field-based evidence that soil transport is a nonlinear, depth-dependent function. Data from all sites suggest that the widely used linear diffusion equation is only appropriate for shallow gradient, convex-up regions, while the depth-dependent transport law is more broadly applicable. Quantifying both the mobile soil thickness and landscape morphology is therefore critical to understanding how landscapes evolve.

Original languageEnglish (US)
Pages (from-to)949-952
Number of pages4
JournalGeology
Volume33
Issue number12
DOIs
StatePublished - Dec 1 2005
Externally publishedYes

Keywords

  • Cosmogenic nuclides
  • Erosion
  • Geomorphology
  • Landscape evolution
  • Soil transport

ASJC Scopus subject areas

  • Geology

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