Quantification of soil production and downslope creep rates from cosmogenic 10Be accumulations on a hillslope profile

McKean, J. A.; Dietrich, W. E.; Finkel, Robert C.; Southon, John; Caffee, Marc W.

doi:10.1130/0091-7613(1993)021<0343:qospad>2.3.co;2

Cited by 205 publications

(201 citation statements)

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“…Dietrich et al, 2003) have been developed and tested, particularly since the advent of cosmogenic radionuclide dating and high-resolution topographic measurements. In addition to the conceptually simple linear flux law (Culling, 1960;McKean et al, 1993;Tucker and Slingerland, 1997;Small et al, 1999;Booth et al, 2013), models of depth-dependent (Braun et al, 2001;Furbish and Fagherazzi, 2001;Heimsath et al, 2005;Roering, 2008) and nonlinear sediment flux (Andrews and Bucknam, 1987;Roering et al, 1999Roering et al, , 2001Roering et al, , 2007 have been employed, alongside models which directly consider sediment particle motion Tucker and Bradley, 2010;Furbish and Roering, 2013).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

A nondimensional framework for exploring the relief structure of landscapes

et al. 2016

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Abstract. Considering the relationship between erosion rate and the relief structure of a landscape within a nondimensional framework facilitates the comparison of landscapes undergoing forcing at a range of scales, and allows broad-scale patterns of landscape evolution to be observed. We present software which automates the extraction and processing of relevant topographic parameters to rapidly generate nondimensional erosion rate and relief data for any landscape where high-resolution topographic data are available. Individual hillslopes are identified using a connected-components technique which allows spatial averaging to be performed over geomorphologically meaningful spatial units, without the need for manual identification of hillslopes.The software is evaluated on four landscapes across the continental United States, three of which have been studied previously using this technique. We show that it is possible to identify whether landscapes are in topographic steady state. In locations such as Cascade Ridge, CA, a clear signal of an erosional gradient can be observed. In the southern Appalachians, nondimensional erosion rate and relief data are interpreted as evidence for a landscape decaying following uplift during the Miocene. An analysis of the sensitivity of this method to free parameters used in the data smoothing routines is presented which allows users to make an informed choice of parameters when interrogating new topographic data using this method. A method to constrain the critical gradient of the nonlinear sediment flux law is also presented which provides an independent constraint on this parameter for three of the four study landscapes.

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Section: Theoretical Backgroundmentioning

confidence: 99%

A nondimensional framework for exploring the relief structure of landscapes

et al. 2016

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“…These low-relief landscapes are characterised by slow sediment production coupled with slow and intermittent sediment supply to surrounding basins. The typically slow rate of crustal deformation means lim- 15 ited accommodation space, resulting in thin and discontinuous sedimentary records (Armitage et al, 2011). Aridity imposes a strongly episodic character to the sediment-routing system.…”

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confidence: 99%

Tracking the <sup>26</sup>Al/<sup>10</sup>Be source-area signal in sediment-routing systems of arid central Australia

Struck¹,

Jansen²,

Fujioka³

et al. 2018

Preprint

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“…This relation has been shown to reasonably predict sediment erosion rates in regolith-mantled landscapes where soil creep occurs [e.g., McKean et al, 1993;Roering et al, 2002]. Our model assumes that regolith is produced at the same rate as erosion.…”

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Characteristics of steady state fluvial topography above fault‐bend folds

2007

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[1] In steady state convergent orogens, erosion balances lateral as well as vertical bedrock motions. For simple geometrical reasons, the difference between the total steady state erosion flux and its vertical component is up to 30% for typical fluvial slopes and bedrock streamline inclinations, suggesting that lateral advection is also likely to be expressed topographically. In order to understand these geomorphologic consequences, we focus on steady state topography developed on active fault-bend folds. First, we derive an analytical solution for the slopes of detachment-limited streams that incorporates lateral advection. Next, we conduct experiments using a numerical two-dimensional landscape evolution model (Channel-Hillslope Integrated Landscape Development model (CHILD)) incorporating linear diffusion on hillslopes and detachment-limited stream channel incision above a fault-bend fold. The concavity and steepness indices of steady state long profiles are functions of bedrock velocity magnitude and direction, streamflow direction, and fluvial erosivity. Asymmetry of mountain range profiles varies as a function of fluvial erosivity or bedrock velocity only if we account for the lateral velocity component. This asymmetry is equally sensitive to this lateral component, fluvial incision, and hillslope diffusion. However, the effect of diffusion on drainage divide position is significant only at high diffusivities, short length scales, low bedrock advection rates, or relatively low fluvial erosivity. Thus in most mountain ranges and fault blocks, drainage divide migration is expected to be dictated by stream channel erosion. Model results are shown to be consistent with topography in the Siwalik Hills, Nepal, which overlie fault-bend folds produced above the frontal fault systems in the Himalayan foreland.

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Quantification of soil production and downslope creep rates from cosmogenic 10Be accumulations on a hillslope profile

Cited by 205 publications

References 0 publications

A nondimensional framework for exploring the relief structure of landscapes

A nondimensional framework for exploring the relief structure of landscapes

Tracking the <sup>26</sup>Al/<sup>10</sup>Be source-area signal in sediment-routing systems of arid central Australia

Characteristics of steady state fluvial topography above fault‐bend folds

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Quantification of soil production and downslope creep rates from cosmogenic 10Be accumulations on a hillslope profile

Cited by 205 publications

References 0 publications

A nondimensional framework for exploring the relief structure of landscapes

A nondimensional framework for exploring the relief structure of landscapes

Tracking the &lt;sup&gt;26&lt;/sup&gt;Al/&lt;sup&gt;10&lt;/sup&gt;Be source-area signal in sediment-routing systems of arid central Australia

Characteristics of steady state fluvial topography above fault‐bend folds

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Tracking the <sup>26</sup>Al/<sup>10</sup>Be source-area signal in sediment-routing systems of arid central Australia