Joel P. L. Johnson

TL;DR: In this article, a method for extracting topographic indices of longitudinal profi le shape and character from digital topographic data is described, which can then be used to delineate breaks in scaling that may be associated with tectonic boundaries.

TL;DR: In this paper, the authors explore the evidence for seepage erosion in bedrock to address whether valley morphology can be used as a diagnostic indicator of erosion, and they find that erosion is an important process in loose sediment where hydraulic forces cause grain detachment, often resulting in amphitheater-headed valleys.

TL;DR: In this paper, the authors compare several small channels that share tributary junctions and have incised into the same sedimentary bedrock unit (Navajo Sandstone) but contain differing amounts of coarse diorite clasts owing to the spatial distribution of localized sediment sources.

TL;DR: In this paper, the authors explore the mechanics of river incision and find that patterns of erosion both create and are sensitive functions of the evolving bed topography because of feedbacks between the turbulent flow field, sediment transport and bottom roughness.

TL;DR: In this paper, the authors explored the dependence of experimental bedrock erosion rate on shear stress, bed load sediment flux, alluvial bed cover, and evolving channel morphology, and isolated these variables experimentally by systematically varying gravel sediment flux Qs and water discharge Qw in a laboratory flume, gradually abrading weak concrete "bedrock".