Submarine deltaic geometries linked to steep, mountainous drainage basins in the northern shelf of the Alboran Sea: Filling the gaps in the spectrum of deltaic deposition

Bárcenas, P.; Lobo, F. J.; Macías, Jorge; Fernández-Salas, L.M.; López-González, N.; Río, Víctor Díaz del

doi:10.1016/j.geomorph.2014.11.028

Cited by 18 publications

(12 citation statements)

References 56 publications

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“…Different bottom slopes, ranging from a horizontal basin up to a 10% bottom slope, were used to produce 18 different numerical runs ( m = [0, 0.1, 0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, 3, 4, 5, 6, 7, 8, 9, and 10]%). These slope values are consistent with river mouth geometries observed in the field [ Bárcenas et al , ].…”

Section: Numerical Modelsupporting

confidence: 90%

“…75, 2, 3, 4, 5, 6, 7, 8, 9, and 10]%). These slope values are consistent with river mouth geometries observed in the field [Bárcenas et al, 2015].…”

Section: Model Setupmentioning

confidence: 99%

“…The aforementioned works focusing on bar formation were conducted with outlet geometries characterized by horizontal or quasi-horizontal receiving basins. However, coastal inlets frequently exhibit high variability in their bathymetric profiles [Bárcenas et al, 2015]. Although many authors have studied the dynamics of natural river-dominated deltas with gentle slopes [Özsoy, 1986;Edmonds and Slingerland, 2007;Leonardi et al, 2013;Caldwell and Edmonds, 2014], few have studied areas with steeper slopes.…”

Section: Introductionmentioning

confidence: 99%

“…Although many authors have studied the dynamics of natural river-dominated deltas with gentle slopes [Özsoy, 1986;Edmonds and Slingerland, 2007;Leonardi et al, 2013;Caldwell and Edmonds, 2014], few have studied areas with steeper slopes. Steeply dipping forest-dominated deltas, also known as Gilbert-type deltas [Gilbert, 1890], can be found in both marine and lacustrine environments characterized by low-energy basins where wave and tidal influences can be neglected [Postma, 1995;Viparelli et al, 2012;Bárcenas et al, 2015]. These latter deltaic systems are usually fed by relatively small rivers with high seasonal variability and high slope due to the short distance between the mountain ranges and the coast.…”

Section: Introductionmentioning

confidence: 99%

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Effects of basin bottom slope on jet hydrodynamics and river mouth bar formation

Jiménez-Robles

Ortega-Sánchez

Losada

2016

J. Geophys. Res. Earth Surf.

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River mouth bars are strategic morphological units primarily responsible for the development of entire deltaic systems. This paper addresses the role of receiving basin slope in the hydrodynamics of an exiting sediment‐laden turbulent jet and in resulting mouth bar morphodynamics. We use Delft3D, a coupled hydrodynamic and morphodynamic numerical model, along with a theoretical formulation to reproduce the physics of the problem, characterized by a fluvially dominated inlet free of waves and tides. We propose an updated theoretical model with a slope‐dependent entrainment coefficient, showing that the rate at which ambient fluid is incorporated into a jet increases with higher basin slopes. Transient results reveal that the magnitude of a basin slope can alter the stability of a jet, favoring the formation of an unstable meandering jet. While a stable jet gives rise to “middle‐ground” bars accompanied by diverging channels, a “lunate” mouth bar results from unstable jets. Additional morphodynamic simulations demonstrate that the time required for mouth bar stagnation in its final position increases linearly with the basin slope. In contrast, the distance at which the mouth bar eventually forms decreases until reaching an asymptotic value for slopes higher than 2%. Moreover, the basin slope highly influences sedimentary processes responsible for bar formation: for milder slopes, progradation processes prevail, while in steeper basins aggradation is more relevant. Finally, the minimum relative water depth over a bar crest that forces the flow to bifurcate around a fully developed bar decreases with the basin slope.

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Section: Numerical Modelsupporting

confidence: 90%

“…75, 2, 3, 4, 5, 6, 7, 8, 9, and 10]%). These slope values are consistent with river mouth geometries observed in the field [Bárcenas et al, 2015].…”

Section: Model Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of basin bottom slope on jet hydrodynamics and river mouth bar formation

Jiménez-Robles

Ortega-Sánchez

Losada

2016

J. Geophys. Res. Earth Surf.

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“…In detail, the near-shore terrace is very similar in size and depth of its edge to present-day examples of prograding wedges observed on others insular shelves along the Mediterranean area, such as in the other Aeolian Islands [22] and the Pontine Archipelago [18,30] as well as along tectonically-controlled continental margins of Southern Iberia (infralittoral prograding wedge, [31]) and Southern Italy [32]. The depth range (10-25 m) of these edges is, in fact, compatible with the estimated present-day, local storm-wave base level in the central and western Mediterranean [20,21,33], whereas it is markedly lower with respect to the edge of similar features observed around oceanic islands, where the storm-base level is deeper [13,14,23]. Based on such evidences and considering that the present-day level has been attained since ca.…”

Section: Late-quaternary Evolution Of Insular Shelf and Overlying Subsupporting

confidence: 81%

Submarine Depositional Terraces at Salina Island (Southern Tyrrhenian Sea) and Implications on the Late-Quaternary Evolution of the Insular Shelf

et al. 2018

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Abstract:The integrated analysis of high-resolution multibeam bathymetry and single-channel seismic profiles around Salina Island allowed us to characterize the stratigraphic architecture of the insular shelf. The shelf is formed by a gently-sloping erosive surface carved on the volcanic bedrock, mostly covered by sediments organized in a suite of terraced bodies, i.e. submarine depositional terraces. Based on their position on the shelf, depth range of their edge and inner geometry, different orders of terraces can be distinguished. The shallowest terrace (near-shore terrace) is a sedimentary prograding wedge, whose formation can be associated to the downward transport of sediments from the surf zone and shoreface during stormy conditions. According to the range depth of the terrace edge (i.e., 10-25 m, compatible with the estimated present-day, local storm-wave base level in the central and western Mediterranean), the formation of this wedge can be attributed to the present-day highstand. By assuming a similar genesis for the deeper terraces, mid-shelf terraces having the edge at depths of 40-50 m and 70-80 m can be attributed to the late and early stages of the Post-LGM transgression, respectively. Finally, the deepest terrace (shelf-edge terrace) has the edge at depths of 130-160 m, being thus referable to the lowstand occurred at ca. 20 ka. Based on the variability of edge depth in the different sectors, we also show how lowstand terraces can be used to provide insights on the recent vertical movements that affected Salina edifice in the last 20 ka, highlighting more generally their possible use for neo-tectonic studies elsewhere. Moreover, being these terraces associated to different paleo-sea levels, they can be used to constrain the relative age of the different erosive stages affecting shallow-water sectors.

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Seafloor Morphology and Processes in the Alboran Sea

Ercilla

Vázquez

Alonso

et al. 2021

Alboran Sea - Ecosystems and Marine Resources

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Submarine deltaic geometries linked to steep, mountainous drainage basins in the northern shelf of the Alboran Sea: Filling the gaps in the spectrum of deltaic deposition

Cited by 18 publications

References 56 publications

Effects of basin bottom slope on jet hydrodynamics and river mouth bar formation

Effects of basin bottom slope on jet hydrodynamics and river mouth bar formation

Submarine Depositional Terraces at Salina Island (Southern Tyrrhenian Sea) and Implications on the Late-Quaternary Evolution of the Insular Shelf

Seafloor Morphology and Processes in the Alboran Sea

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