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Figure 3. Cartoon (from Dietrich et al., 1982) to illustrate the observation that colluvium-mantled bedrock valleys may experience a cycle of accumulation and discharge of colluvium (drawing by L. Reid). Although highly idealized, the essential idea (which is supported with radiocarbon dating, field mapping, and theory) is illustrated: progressive accumulation of colluvium in the valley axis (from B to C) , followed by discharge (A), and then refilling. Instability may result from progressive thickening alone, or be influence by fire, disease, logging, roads or other disturbances.
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Copyright 1998, William Dietrich and David Montgomery
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