Abstract

Denudation rates on Mount Rainier, Washington, were determined by estimating dissection of the original landform, volumes of glacial and lahar deposits, present sediment loads of meltwater streams, reservoir sedimentation rates, and super-glacial debris loads. Rates are generally as great or greater than rates in other glaciated basins. The highest rates (3,000 to 8,000 mm/1,000 yr) were indicated by stream-sediment loads and reservoir sedimentation; however, modern stream-sediment loads may be abnormally great because of the exposure of large amounts of unstable debris by twentieth-century glacier retreat. Catastrophic events, including lahars and large rockfalls, account for a substantial part of the total erosion.

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