The Laitaure Delta: A Study of Deltaic Morphology and Processes

Axelsson, Valter

doi:10.2307/520865

Cited by 57 publications

(41 citation statements)

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“…15) (Lopez-Blanco, 1996;Molenaar and Martinius, 1996;Lopez-Blanco et al, 2003), probably created significant water depths required for the Gilbert-type foreset beds to form (see discussion). In accordance with the tripartite division of Gilbert-type deltas into topset, foreset (FA 1b), and bottomset (FA 1a, FA 4a) beds (Gilbert, 1885;Axelsson, 1967;Bogen, 1983;Massari and Colella, 1988;Nemec, 1990;Postma, 1990;Wescott and Ethridge, 1990), no Gilbert-type topset beds were found in the current succession. Their absence may be a consequence of low preservation in lowstand and transgressive settings.…”

Section: The Gilbert-type Delta Systemsupporting

confidence: 73%

Controls on stratigraphic architecture in contemporaneous delta systems from the Eocene Roda Sandstone, Tremp-Graus Basin, northern Spain

Leren

Howell²,

Enge

et al. 2010

Sedimentary Geology

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Section: The Gilbert-type Delta Systemsupporting

confidence: 73%

Controls on stratigraphic architecture in contemporaneous delta systems from the Eocene Roda Sandstone, Tremp-Graus Basin, northern Spain

Leren

Howell²,

Enge

et al. 2010

Sedimentary Geology

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“…There is a large body of literature on this topic (e.g. Axelsson 1967;Coleman 198 1). When river suspended solids loads are high, this process can be the dominant deposition mechanism, e.g.…”

Section: Sediment Distribution Processes In Small Lakesmentioning

confidence: 99%

The dominant processes of sediment distribution and focusing in a small, eutrophic, monomictic lake

Hilton

Lishman

Allen

1986

Limnology & Oceanography

176

103

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There is evidence for 10 mechanisms of sediment distribution in small lakes. The sediment accumulation rates measured from a common horizon in cores from 64 sites on Esthwaite Water, U.K., were used to determine the relative importance of these mechanisms on the distribution of sediment in the lake.River inflows generally produced localized effects but there were indications of periodic turbidity flows to the deepest point of the lake from the major inflow. Active sediment focusing processes were the dominant distribution mechanisms, a major resuspension of sediment at autumn overturn probably being the most important. The remaining variance was much greater than observed in similar work elsewhere, suggesting that redistribution of sediment by direct and indirect wave action may be taking placeall over the lakebcd during isothermal periods. The relative contributions of the different processes were corroborated by analysis of previously published sediment trap data.

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“…Only a few field studies exist [Axelsson, 1967;Andren, 1994;Sloff et al, 2003;Edmonds and Slingerland, 2007], experimental studies are hampered by scaling considerations [Zanichelli et al, 2004], and theoretical studies are limited to Wang et al [1995] and Slingerland and Smith [1998].…”

Section: High Q Bifurcationsmentioning

confidence: 99%

Stability of delta distributary networks and their bifurcations

Edmonds

Slingerland

2008

Water Resources Research

125

150

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[1] Delta distributary networks are created by bifurcating channels that commonly split their discharges unequally. The origin and stability of these asymmetrical fine-grained cohesive bifurcations are investigated here using Delft3D, a morphodynamic flow and sediment transport model. Results are compared to bifurcations on the Mossy delta, Saskatchewan, Canada, that have remained stable for decades. Over a range of channel aspect ratios, friction factors, and Shields numbers, we find three equilibrium functions relating the discharge ratio of the bifurcate arms at equilibrium to the Shields number. One function defines symmetrical configurations (equal partitioning of discharge), while the other two define asymmetrical configurations (unequal partitioning of discharge). Discharge asymmetries and morphologies of Mossy delta bifurcations are consistent with these predictions. Among the equilibrium bifurcations, only the asymmetrical type is stable to perturbations, such as a partial closing of one throat. This possibly explains why asymmetrical bifurcations are more common in nature.

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The Laitaure Delta: A Study of Deltaic Morphology and Processes

Cited by 57 publications

References 0 publications

Controls on stratigraphic architecture in contemporaneous delta systems from the Eocene Roda Sandstone, Tremp-Graus Basin, northern Spain

Controls on stratigraphic architecture in contemporaneous delta systems from the Eocene Roda Sandstone, Tremp-Graus Basin, northern Spain

The dominant processes of sediment distribution and focusing in a small, eutrophic, monomictic lake

Stability of delta distributary networks and their bifurcations

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