Self-organisation, fractal scaling and cyclicity in Late Midlandian glacio-deltaic sediments associated with Glacial Lake Blessington, Co. Wicklow

Richards, Andrew E.

doi:10.1016/s0037-0738(01)00248-2

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…To use this approach for forward prediction at the USDOE's Hanford site, it will be necessary to estimate D from borehole data. Fractal analyses of stratigraphic sequences performed by Richards (2002) and Bailey and Smith (2005) provide examples of what is possible.…”

Section: Discussionmentioning

confidence: 99%

“…A number of techniques are available for estimating D from borehole data, including spectral analysis, rescaled range analysis, and variogram analysis (Turcotte, 1997; Plotnick and Prestegaard, 1995). Based on spectral analysis, Tubman and Crane (1995) and Richards (2002) reported fractal dimensions of about 0.17 for vertically oriented logs in a braided‐stream sandstone deposit and 0.3 for a glaciodeltaic cross‐bedded sand deposit, respectively.…”

Section: Theorymentioning

confidence: 99%

“…Mandelbrot and Wallis (1969) were the first to analyze bed thickness series in a stratigraphic sequence using fractals. Since then many researchers have applied fractal techniques to both parameterize (e.g., Hewett, 1986; Tubman and Crane, 1995; Richards et al, 2000; Richards, 2002; Bailey and Smith, 2005) and simulate (e.g., Plotnick, 1986, 1988; Plotnick and Prestegaard, 1995; Schlager, 2004) the frequency and magnitude of layers in stratigraphic sequences.…”

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confidence: 99%

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Estimating Effective Hydraulic Parameters of Unsaturated Layered Sediments Using a Cantor Bar Composite Medium Model

Tang

Perfect

Berg

et al. 2008

Vadose Zone Journal

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The estimation of effective hydraulic parameters of variably saturated layered sediments has been extensively studied using deterministic, stochastic, and combined modeling approaches. Heterogeneity and scale dependence remain as major obstacles, however, for the prediction of water flow and contaminant transport at many U.S. Department of Energy sites. We used a physically based Cantor bar model to describe scale dependence of the fractions of coarse and fine materials in layered sediments. The Cantor bar is determined by three fractal parameters: the subdivision factor, b, the fractal dimension, D, and the iteration level, i, which can be estimated from observation (e.g., borehole logs). Because b and D are scale invariant, the model can be used to predict layering at scales other than the observation scale. Together with a composite medium approximation (COMA), the Cantor bar model can be used to predict effective hydraulic properties as a function of scale. Numerical simulation results showed that COMA works well for steady‐state unsaturated flow through a stratigraphic sequence comprised of thin layers of fine material interbedded within a coarse material. Further work is necessary to validate the model predictions by performing measurements at different scales, and to assess the applicability of this approach for transient flow.

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Section: Discussionmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

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confidence: 99%

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Estimating Effective Hydraulic Parameters of Unsaturated Layered Sediments Using a Cantor Bar Composite Medium Model

Tang

Perfect

Berg

et al. 2008

Vadose Zone Journal

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“…This procedure involves counting up the number of transitions between different stratigraphic elements in order to assess whether some transitions are more commonly recorded than others (Miall 1981). This method has been used previously in the Irish Quaternary to examine stratigraphic relationships within drumlin sediments (Dardis 1987) and glacial lake deposits (Richards 2002). Results from 21 stratigraphic patterns at the 28 sites described by Wright & Muff (1904) are shown in Table 1.…”

Section: The Limitations Of Quaternary Lithostratigraphymentioning

confidence: 99%

The limitations of Quaternary lithostratigraphy: an example from southern Ireland

Knight

2009

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Abstract:The lithostratigraphy of Quaternary extra-glacial (cold-climate) sediments is described from five sites along the south coast of Ireland. These sediments are compared to a regional-scale lithostratigraphic framework. This comparison enables consideration of the applicability of standard lithostratigraphic principles and practices to the Quaternary record. It is concluded that a strict lithostratigraphic approach is not favourable towards interpreting the age or depositional process/environment of Quaternary sediments, either in isolation or as part of a sedimentary succession. The concepts of time transgression and lateral equivalence are useful interpretive tools that can support lithostratigraphic procedures as applied to the Quaternary record.

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“…The understanding of the specific depositional processes, the resultant facies, and their spatial distribution within glacially influenced subaqueous environments has been developed from various glaciolacustrine settings (e.g. Clemmensen & Houmark-Nielsen, 1981;Teller & Clayton, 1983;Thomas, 1984;Smith & Ashley, 1985;Eyles & Clark, 1988;Fyfe, 1990;Martini, 1990;Mastalerz, 1990;Sharpe & Cowan, 1990;Gorrell & Shaw, 1991;Martini & Brookfield, 1995;Ashley, 1995;Teller, 1995;Brookfield & Martini, 1999;Bennett et al, 2002;Knudsen & Marren, 2002;Lajeunesse & Michel, 2002;Richards, 2002;Russell & Arnott, 2003;Johnsen & Brennand, 2006). Depositional processes and the resulting facies architecture are highly variable because the margins of ice-contact lakes continually change as glaciers advance or retreat and as ice melts and sediment is released.…”

Section: Introductionmentioning

confidence: 99%

Lake‐Level Control on Ice‐Margin Subaqueous Fans, Glacial Lake Rinteln, Northwest Germany

Winsemann

Asprion

Meyer

2007

Glacial Sedimentary Processes and Products

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During the maximum advance of the Early Saalian Scandinavian Ice Sheet ice-dammed lakes developed within valleys of the Northwest German Mountain ranges. The blocking of the River Weser valley led to the formation of glacial Lake Rinteln where most of the sediment was deposited by meltwater. Two subaqueous fan complexes have been identified, which formed lakeward of retreating ice-lobes during an overall lake-level rise. The sediment transport on the fans has been dominated by sustained gravity-flows, mainly cohesionless debris flows or high-and low-density turbidity currents, reflecting discharge of semi-continuous meltwater flows. Intercalations of surge-type high-and lowdensity turbidites increase towards the mid-and lower-fan slopes, indicating more ice-distal and periodic deposition. Individual fan bodies commonly have a coarse-grained proximal core of steeply dipping gravel, overlain by gently to steeply dipping mid-to outer fan deposits. During glacier retreat commonly fine-grained sediments, rich in ice-rafted debris, were deposited on the ice-distal and ice-proximal slopes of the abandoned fans. Climbing-ripple cross-laminated sand may onlap coarse-grained upper fan gravel and in some cases overtop the older fan deposits. Phases of glacier still-stands are characterised by fan systems that display an upward flattening of fan clinoforms and minor vertical facies changes. The position of ice marginal fans was controlled by the combination of bedrock topography and water depth. At the eastern lake margin topographic highs served as pinning points for the retreating glacier and facilitated ice margin stabilisation. A strong lake-level fall probably triggered a major drainage event that tapped previously unconnected reservoirs of englacial and subglacial meltwater.

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Self-organisation, fractal scaling and cyclicity in Late Midlandian glacio-deltaic sediments associated with Glacial Lake Blessington, Co. Wicklow

Cited by 7 publications

References 18 publications

Estimating Effective Hydraulic Parameters of Unsaturated Layered Sediments Using a Cantor Bar Composite Medium Model

Estimating Effective Hydraulic Parameters of Unsaturated Layered Sediments Using a Cantor Bar Composite Medium Model

The limitations of Quaternary lithostratigraphy: an example from southern Ireland

Lake‐Level Control on Ice‐Margin Subaqueous Fans, Glacial Lake Rinteln, Northwest Germany

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