A submarine channel confluence classification for topographically confined slopes

Gamboa, Davide; Alves, Tiago Marcos; Cartwright, Joseph Albert

doi:10.1016/j.marpetgeo.2012.02.011

Cited by 40 publications

(48 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various architectural elements, such as mass-transport deposits (MTDs), turbidite lobes, submarine canyons and channels are observed within a salt-withdrawal basin delimited by salt diapirs D1 to D6 (Gamboa and Alves, 2015). These elements are strongly influenced by the relative location and movement of the salt diapirs (Baudon and Cartwright, 2008;Alves et al, 2009;Gamboa et al, 2012;Gamboa and Alves, 2015). Topographic confinement created by salt diapirs is reflected by changes in channel density, geometry and sinuosity (Alves et al, 2009;Gamboa et al, 2012).…”

Section: Salt Tectonics In the Espírito Santo Basinmentioning

confidence: 99%

“…These elements are strongly influenced by the relative location and movement of the salt diapirs (Baudon and Cartwright, 2008;Alves et al, 2009;Gamboa et al, 2012;Gamboa and Alves, 2015). Topographic confinement created by salt diapirs is reflected by changes in channel density, geometry and sinuosity (Alves et al, 2009;Gamboa et al, 2012). As an example, channel density decreases from the unconfined region to the topographically confined region (Gamboa et al, 2012).…”

Section: Salt Tectonics In the Espírito Santo Basinmentioning

confidence: 99%

“…Topographic confinement created by salt diapirs is reflected by changes in channel density, geometry and sinuosity (Alves et al, 2009;Gamboa et al, 2012). As an example, channel density decreases from the unconfined region to the topographically confined region (Gamboa et al, 2012).…”

Section: Salt Tectonics In the Espírito Santo Basinmentioning

confidence: 99%

“…At least three major channel events have been identified within the Rio Doce Canyon system (Fig. 5): (1) an Eocene channel system controlled by adjacent faults generated on the flanks of growing diapirs (Alves et al, 2009), (2) a Miocene channel system with multiple laterally shifting channels, and (3) a PlioceneQuaternary channel complex set confined by salt diapirs (Gamboa et al, 2012) (Fig. 5).…”

Section: Rio Doce Canyon System In the Espírito Santo Basinmentioning

confidence: 99%

“…Three slope regions have been defined based on the degree of confinement imposed by salt diapirs deforming the seafloor (Gamboa et al, 2012) (Fig. 8).…”

Section: Seafloor Morphologymentioning

confidence: 99%

See 4 more Smart Citations

Quantitative seismic geomorphology of a submarine channel system in SE Brazil (Espírito Santo Basin): Scale comparison with other submarine channel systems

Qin

Alves

Constantine

et al. 2016

Marine and Petroleum Geology

Self Cite

View full text Add to dashboard Cite

Detailed morphological analyses of a Pleistocene-Holocene submarine channel system in terms of its hierarchical framework, were carried out using a 3D seismic volume from offshore Espírito Santo, SE Brazil. The channel morphology shows marked variations, with five segments (Segments a to e) being identified along its full length. For example, the cross-sectional area of the channel decreases by a factor of 70 from Segment a to Segment c, and is then followed by a nearly four-fold increase from Segment c to Segment d. The significant changes in channel morphology relate to temporal and spatial variations in flow volume within the channel. In the same channel system, the valley reveals three distinct segments (Segments A to C), with similar aspect ratios but marked variations in morphology along the valley distance. Valley morphological changes are chiefly affected by erosional processes. Segment B is characterised by the largest valley-base width, valley width, and cross-sectional area compared to the other two segments. Valley enlargement in Segment B results from relatively high degrees of lateral channel migration and associated cut bank erosion, leading to the widening of the valley, especially the valley base. In Segment C, the valley is characterised by inner bank erosion in the form of shallow-seated mass failures, which only enlarged the upper part of the valley wall. The spatial variations in both channel and valley morphology documented here suggest an important role of local factors (e.g. salt diapirs, tributaries, overbank collapse) in the development of channel systems. Hence, the morphological analyses developed in this work provide an effective tool for studying channels and valleys on continental slopes around the world.

show abstract

Section: Salt Tectonics In the Espírito Santo Basinmentioning

confidence: 99%

Section: Salt Tectonics In the Espírito Santo Basinmentioning

confidence: 99%

Section: Salt Tectonics In the Espírito Santo Basinmentioning

confidence: 99%

Section: Rio Doce Canyon System In the Espírito Santo Basinmentioning

confidence: 99%

“…Three slope regions have been defined based on the degree of confinement imposed by salt diapirs deforming the seafloor (Gamboa et al, 2012) (Fig. 8).…”

Section: Seafloor Morphologymentioning

confidence: 99%

See 3 more Smart Citations

Quantitative seismic geomorphology of a submarine channel system in SE Brazil (Espírito Santo Basin): Scale comparison with other submarine channel systems

Qin

Alves

Constantine

et al. 2016

Marine and Petroleum Geology

Self Cite

View full text Add to dashboard Cite

show abstract

Confluence of density currents over an erodible bed

2016

View full text Add to dashboard Cite

Results from laboratory experiments on conservative density current confluence are reported. Hydraulic characteristics and morphodynamic consequences of the confluence of two continuous release density currents in a horizontal, 45• asymmetrical junction are examined and compared to those of terrestrial river junctions. It was observed that density current confluence is markedly different than those in river junctions primarily due to the ease of the dense fluid to convect into the ambient fluid in the junction zone. Upward convection in the junction resulted in low horizontal velocity and shear stresses on the bed of the junction zone, followed by re-plunging to the layer of neutral buoyancy downstream of the junction where acceleration occurs. In the downstream reach was a distinctive erosional pattern similar to central scouring seen in river junctions but starting at the downstream junction point rather than at the upstream junction point. It was found that terrestrial river models match well with the density current case in terms of maximum velocity downstream of the junction, backwater effect, avalanche face protrusion into the downstream reach, and maximum scour orientation. Poor matching was found in terms of separation zone dimensions and shape, streamline deviation angle on the junction line, and maximum scour depth.iv

show abstract

Style and Morphometry of Mass‐Transport Deposits Across the Espírito Santo Basin (Offshore SE Brazil)

Gamboa

Alves

Omosanya³

2019

Geophysical Monograph Series

View full text Add to dashboard Cite

A submarine channel confluence classification for topographically confined slopes

Cited by 40 publications

References 68 publications

Quantitative seismic geomorphology of a submarine channel system in SE Brazil (Espírito Santo Basin): Scale comparison with other submarine channel systems

Quantitative seismic geomorphology of a submarine channel system in SE Brazil (Espírito Santo Basin): Scale comparison with other submarine channel systems

Confluence of density currents over an erodible bed

Style and Morphometry of Mass‐Transport Deposits Across the Espírito Santo Basin (Offshore SE Brazil)

Contact Info

Product

Resources

About