Modeled Paleoflood Hydraulics as a Tool for Interpreting Bedrock Channel Morphology

2013 ◽  
pp. 345-358
Author(s):  
Ellen Wohl
Keyword(s):  
Channel Morphology ◽  
Bedrock Channel

scholarly journals A probabilistic framework for the cover effect in bedrock erosion

2016 ◽  
Author(s):  
Jens M. Turowski ◽  
Rebecca Hodge
Keyword(s):  
Time Scales ◽  
Channel Morphology ◽  
Scale Model ◽  
Probabilistic Framework ◽  
Channel Dynamics ◽  
Base Level ◽  
Bedrock Channel ◽  
Bedrock Erosion ◽  
Long Time ◽  
Bedrock Channels

Abstract. The cover effect in fluvial bedrock erosion is a major control on bedrock channel morphology and long-term channel dynamics. Here, we suggest a probabilistic framework for the description of the cover effect that can be applied to field, laboratory and modelling data and thus allows the comparison of results from different sources. The framework describes the formation of sediment cover as a function of the probability of sediment being deposited on already alleviated areas of the bed. We define benchmark cases and suggest physical interpretations of deviations from these benchmarks. Furthermore, we develop a reach-scale model for sediment transfer in a bedrock channel and use it to clarify the relations between the sediment mass residing on the bed, the exposed bedrock fraction and the transport stage. We derive system time scales and investigate cover response to cyclic perturbations. The model predicts that bedrock channels achieve grade in steady state by adjusting bed cover. Thus, bedrock channels have at least two characteristic time scales of response. Over short time scales, the degree of bed cover is adjusted such that they can just transport the supplied sediment load, while over long time scales, channel morphology evolves such that the bedrock incision rate matches the tectonic uplift or base level lowering rate.

Bedrock channel morphology

2001 ◽  
Vol 113 (9) ◽  
pp. 1205-1212 ◽  
Author(s):  
Ellen E. Wohl ◽  
David M. Merritt
Keyword(s):  
Channel Morphology ◽  
Bedrock Channel

Numerical Simulation of Effects of Sediment Supply on Bedrock Channel Morphology

2016 ◽  
Vol 142 (7) ◽  
pp. 04016014 ◽  
Author(s):  
T. Inoue ◽  
T. Iwasaki ◽  
G. Parker ◽  
Y. Shimizu ◽  
N. Izumi ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Channel Morphology ◽  
Sediment Supply ◽  
Bedrock Channel

scholarly journals A probabilistic framework for the cover effect in bedrock erosion

2017 ◽  
Vol 5 (2) ◽  
pp. 311-330 ◽  
Author(s):  
Jens M. Turowski ◽  
Rebecca Hodge
Keyword(s):  
Channel Morphology ◽  
Scale Model ◽  
Probabilistic Framework ◽  
Channel Dynamics ◽  
Base Level ◽  
Bedrock Channel ◽  
Sediment Mass ◽  
Bedrock Erosion ◽  
Long Timescales ◽  
Bedrock Channels

Abstract. The cover effect in fluvial bedrock erosion is a major control on bedrock channel morphology and long-term channel dynamics. Here, we suggest a probabilistic framework for the description of the cover effect that can be applied to field, laboratory, and modelling data and thus allows the comparison of results from different sources. The framework describes the formation of sediment cover as a function of the probability of sediment being deposited on already alluviated areas of the bed. We define benchmark cases and suggest physical interpretations of deviations from these benchmarks. Furthermore, we develop a reach-scale model for sediment transfer in a bedrock channel and use it to clarify the relations between the sediment mass residing on the bed, the exposed bedrock fraction, and the transport stage. We derive system timescales and investigate cover response to cyclic perturbations. The model predicts that bedrock channels can achieve grade in steady state by adjusting bed cover. Thus, bedrock channels have at least two characteristic timescales of response. Over short timescales, the degree of bed cover is adjusted such that the supplied sediment load can just be transported, while over long timescales, channel morphology evolves such that the bedrock incision rate matches the tectonic uplift or base-level lowering rate.

Linkages Between Lithology, Bedrock River Morphology, Alluvial Cover, and Riparian Vegetation Abundance in Canyons

2019 ◽  
Author(s):  
Daniel N. Scott ◽  
José Ortega-Becerril
Keyword(s):  
Riparian Vegetation ◽  
Channel Morphology ◽  
Advisory Board ◽  
Rock Properties ◽  
River Morphology ◽  
Field Observations ◽  
Bedrock Rivers ◽  
Bedrock Channel ◽  
Spanish Pyrenees ◽  
Sediment Cover

The EarthArXiv Advisory Board has accepted the authors request to withdrawal this paper based on a declaration of major errors in the work that the authors feel cannot be corrected. Narrow, incised canyons exemplify an end member of bedrock rivers in which incision has outpaced widening and morphologic adjustments are sensitive to changes in the balance between driving erosive forces and lithologic resistance to erosion. We use canyons as an ideal environment to observe how variability in rock properties influences bedrock channel morphology and resulting sediment cover and riparian vegetation abundance. We present statistical analysis of field observations from canyons in the Spanish Pyrenees and Utah Canyonlands to explore these linkages.

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