Longitudinal profiles of alluvial and bedrock rivers are typically concave up, and the precise shape of their concavity is known to integrate tectonic, climatic, and channel grain size distribution factors. We isolate climatic/hydrologic effects on profile concavity through a spatial analysis of large watersheds with mixed bedrock-alluvial trunk channels spanning a steep climatic/hydrologic gradient in a tectonically stable landscape. Forty watersheds on the eastern American high plains were selected to m…
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