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    Author(s): James W. Kirchner; Robert C. Finkel; Clifford S. Riebe; Darryl E. Granger; James L. Clayton; John G. King; Walter F. Megahan
    Date: 2001
    Source: Geology. 29(7): 591-594
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (102 KB)

    Description

    We used cosmogenic 10Be to measure erosion rates over 10 k.y. time scales at 32 Idaho mountain catchments, ranging from small experimental watersheds (0.2 km2) to large river basins (35 000 km2). These long-term sediment yields are, on average, 17 times higher than stream sediment fluxes measured over 10–84 yr, but are consistent with 10 m.y. erosion rates measured by apatite fission tracks. Our results imply that conventional sediment-yield measurements—even those made over decades—can greatly underestimate long-term average rates of sediment delivery and thus overestimate the life spans of engineered reservoirs. Our observations also suggest that sediment delivery from mountainous terrain is extremely episodic, sporadically subjecting mountain stream ecosystems to extensive disturbance.

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    Citation

    Kirchner, James W.; Finkel, Robert C.; Riebe, Clifford S.; Granger, Darryl E.; Clayton, James L.; King, John G.; Megahan, Walter F. 2001. Mountain erosion over 10 yr, 10 k.y., and 10 m.y. time scales. Geology. 29(7): 591-594

    Keywords

    erosion rates, sediment yield, Idaho batholith, variability, time scales

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