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1 Department of Earth and Planetary Science, University of California, Berkeley, California 94720-4767, USA
2 Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
3 Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907-1397, USA
4 Rocky Mountain Experiment Station, U.S. Department of Agriculture Forest Service, Boise, Idaho 83702, USA
5 National Council for Air and Stream Improvement, Sequim, Washington 98382, USA
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.
Key Words: erosion rates • sediment yield • Idaho batholith • variability • time scales
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