Analysis of hillslope erosion rates using dated colluvial deposits

S. L. Reneau, W. E. Dietrich, M. Rubin, D. J. Donahue, A. J.T. Jull

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Hollows are sites of long-term deposition of colluvium and contain a valuable record of the timing and rates of hillslope erosion. A model is presented that uses measured depositional rates of colluvium in hollows to calculate transport rates of colluvium and bedrock lowering rates on the surrounding slopes. This model has been applied to eight dated colluvial deposits in the Clearwater River basin of western Washington. The calculated average transport rate is about 34cm3/cm/yr, and the calculated average bedrock lowering rate is about 40B, equivalent to an average sediment yield of 90t/km2/yr for the Holocene. Most basal dates from the hollows are early Holocene in age, a time of warmer and drier climate, suggesting a period of widespread evacuation of colluvium and increased sediment yield. -from Authors

Original languageEnglish (US)
Pages (from-to)45-63
Number of pages19
JournalJournal of Geology
Volume97
Issue number1
DOIs
StatePublished - Jan 1 1989
Externally publishedYes

ASJC Scopus subject areas

  • Geology

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