...W. V. Lewis Abstract Discusses the effects of increase in discharge, comminution of load, the change from erosion to transport, and strata variation in the development of stream profiles and nick points. GeoRef, Copyright 2004, American Geological Institute. Reference includes data from...

.... These values were similar to those found in other studies, including that by Gades et al. (2000 ), who showed that the saturated till beneath Siple Ice stream had an R value of 0.16–0.32. The Briksdalsbreen data were filtered using a five-point (2.5 m) moving average to remove the spatial variation...

... of much larger volumes in higher-energy fluvial environments can create steps in the longitudinal profile (nick points), ponds, log jams, boulder deposits, gravel accumulations, and pools up- and downstream of deposits. Effects of debris flows of several thousand cubic meters in high-energy environments...

... to between 6 and 3.7 m.y.; the wavelength and short duration of this tilting are best explained by the initiation of localized dynamic topography. Our results also suggest a threefold to fourfold increase in specific stream power at this time, meaning that Pliocene rivers draining the central Rockies were...

... is the density of water, g is gravity, Q is discharge, S is the slope, and w is the channel width ( Howard and Kerby, 1983 ). Steepness indexes for analyzing reach-scale channel profiles are, in turn, based on the stream-power erosion model that is derived from Equation 1 . This model includes...

... & Chisholm 1997 ). In summary, two independent processes were operating: deep incision near the emergent delta front due to nick point recession; and reduced, but still significant vertical incision farther upstream, as the swollen channel created a new equilibrium profile ( Fig. 17 ). Both...

...) gun profile from A–A′. Numbered basins correspond with locations on Figures 1 and 3 . Basin 10 and the entrance sill morainal bank are shown enlarged in the inset. Shot points are shown across the horizontal axis for reference. Identified erosional reflectors (R1–R3) and depositional sequences (S1...

.... In these settings, the features form through down‐cutting and lateral erosion along stream channels and differential erosion along vertical joints (Fig.  2 ). Boulders and cobbles within the deposits often provide a resistant cap under which the pinnacle forms. Pinnacles are therefore closely related to hoodoos...

... were mapped in the summers of 1999 and 2000. A detailed map of part of the snout and proglacial area of Midtre Lovénbreen was constructed using a Geotronics Total Station in 1999. Stratigraphic logs of proglacial sediments were measured where exposed by stream erosion at Midtre, Austre and Vestre...

... imagery ( Fig. 5). Nick points formed at the scarp migrate back into the footwall with time so that metre-scale falls are typically found a few tens of metres upstream of the break in slope (and sometimes the edge of farmed land) that marks the range front. As streams dissect the range front they leave...

... suggests the presence of one or more northward-retreating nick points which have yet to reach the E–W-trending Arakapas Fault Zone (although this will not be considered further here). Fig. 10. Same-scale topographic profiles derived from ArcGIS showing large-scale changes down-catchment (see Fig. 8...