subject:(Channel avulsion)

Vanderbilt University

1. Williams, Lauren Alexandra. Late Quaternary stratigraphy and infilling of the Meghna River valley along the tectonically active eastern margin of the Ganges-Brahmaputra-Meghna Delta.

Degree: MS, Earth and Environmental Sciences, 2014, Vanderbilt University

URL: http://hdl.handle.net/1803/11322

► Here sediment provenance from 48 drill cores across a fluvial valley is used to highlight fluvial channel dominance, anticlinal Pleistocene structures, Holocene channel occupations, and… (more)

Subjects/Keywords: avulsion; sediment provenance; fluvial sedimentology; channel steering

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APA (6^th Edition):

Williams, L. A. (2014). Late Quaternary stratigraphy and infilling of the Meghna River valley along the tectonically active eastern margin of the Ganges-Brahmaputra-Meghna Delta. (Thesis). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11322

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Williams, Lauren Alexandra. “Late Quaternary stratigraphy and infilling of the Meghna River valley along the tectonically active eastern margin of the Ganges-Brahmaputra-Meghna Delta.” 2014. Thesis, Vanderbilt University. Accessed March 07, 2021. http://hdl.handle.net/1803/11322.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Williams, Lauren Alexandra. “Late Quaternary stratigraphy and infilling of the Meghna River valley along the tectonically active eastern margin of the Ganges-Brahmaputra-Meghna Delta.” 2014. Web. 07 Mar 2021.

Vancouver:

Williams LA. Late Quaternary stratigraphy and infilling of the Meghna River valley along the tectonically active eastern margin of the Ganges-Brahmaputra-Meghna Delta. [Internet] [Thesis]. Vanderbilt University; 2014. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/1803/11322.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Williams LA. Late Quaternary stratigraphy and infilling of the Meghna River valley along the tectonically active eastern margin of the Ganges-Brahmaputra-Meghna Delta. [Thesis]. Vanderbilt University; 2014. Available from: http://hdl.handle.net/1803/11322

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Melbourne

2. Baky, Md Abdullah Al. Floodplain avulsion channels: understanding their distribution and how they reconnect to the parent channel.

Degree: 2018, University of Melbourne

URL: http://hdl.handle.net/11343/222446

► This study is concerned with new river channels that develop on floodplains. These channels can develop gradually, or they can develop more rapidly (avulsions). This… (more)

▼ This study is concerned with new river channels that develop on floodplains. These channels can develop gradually, or they can develop more rapidly (avulsions). This study concentrates on the relatively more rapid channel changes known as avulsions. An avulsion specifies the gradual abandonment of an existing river-channel and in response to this, the processes of development of a new channel on a floodplain nearby. The study addresses two specific knowledge gaps: 1) how common are river floodplain avulsions globally, and 2) what are the detailed processes that occur at the up and downstream points where avulsions connect to the main channel? Using random sampling from a global spatial layer I discovered that developing avulsions are extremely common on alluvial floodplains globally, wherever the floodplain is wider than several channel widths. Avulsions are most common on single thread meandering floodplain types, but a review of avulsion literature shows that research is biased to relatively less common floodplain types. Avulsions increase the rate of valley widening, particularly in narrow floodplains. There is a relationship between floodplain width and the number of avulsion channels. The rest of the thesis is focussed in the major process knowledge gap which is how avulsion channels connect into the main channel at the up and downstream ends. The focus of the process component of this study is the broad Murray river floodplain from Yarrawonga to Echuca, SE Australia. I mapped and classified developing channels on the floodplain and found that the avulsion connection point here develops in an unusual way, involving the development and coalescence of low points (depressions) on the levee (this mechanism is very different from normal crevasse splay development). The chain of low points on the alluvial levee coalesce to form a levee channel. Rather than forming by erosion as expected from the literature, form progressively by locally reduced vertical accretion. This identifies a new process by which topography is developed on floodplains. Initially the levee channels are not connected with the Murray main stream and slope away from the river. The connection occurs by lateral migration of the river bank into the levee channel, but also by progressive upslope (river ward) migration of the deepest part of the levee channel towards the river, narrowing the gap between the river and the levee channel. Following connection, the levee channel captures flow from the river, and hydraulic modelling shows that shear stress is sufficient to erode the upstream end of the levee channel. As the channel erodes the shear stress declines, but the proportion of back-flow from the flood recession increases. The result is that the slope of the levee channel reverses to slope towards the river. This is a new mechanism, and it is critical in the sequence of avulsion development. The final stage of the development of avulsion is when a knickzone moves up the levee channel joining another levee channel that is…

Subjects/Keywords: avulsion; River; levee; low point; levee channel

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Baky, M. A. A. (2018). Floodplain avulsion channels: understanding their distribution and how they reconnect to the parent channel. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/222446

Chicago Manual of Style (16^th Edition):

Baky, Md Abdullah Al. “Floodplain avulsion channels: understanding their distribution and how they reconnect to the parent channel.” 2018. Doctoral Dissertation, University of Melbourne. Accessed March 07, 2021. http://hdl.handle.net/11343/222446.

MLA Handbook (7^th Edition):

Baky, Md Abdullah Al. “Floodplain avulsion channels: understanding their distribution and how they reconnect to the parent channel.” 2018. Web. 07 Mar 2021.

Vancouver:

Baky MAA. Floodplain avulsion channels: understanding their distribution and how they reconnect to the parent channel. [Internet] [Doctoral dissertation]. University of Melbourne; 2018. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11343/222446.

Council of Science Editors:

Baky MAA. Floodplain avulsion channels: understanding their distribution and how they reconnect to the parent channel. [Doctoral Dissertation]. University of Melbourne; 2018. Available from: http://hdl.handle.net/11343/222446

University of Arkansas

3. McCain, Gordon William. Influences of Channel Dredging on Avulsion Potential at the Atchafalaya River.

Degree: MS, 2016, University of Arkansas

URL: https://scholarworks.uark.edu/etd/1559

► In 1950, the U.S. Army Corps of Engineers (USACE) reported a rapid increase of water discharge from the Mississippi River to its distributary channel;… (more)

▼ In 1950, the U.S. Army Corps of Engineers (USACE) reported a rapid increase of water discharge from the Mississippi River to its distributary channel; the Atchafalaya River. If not prevented by man-made structures, the complete capture of the Mississippi River by the Atchafalaya River was predicted. The USACE report cites multiple causes for the observed increase in discharge partitioning, yet fails to assess the largescale channel dredging operations conducted throughout the Atchafalaya River Basin during the 1930's and 1940's as a potential cause for the increased discharge. To assess the role man-made interventions, specifically channel dredging, played in the increase of discharge partitioning down the Atchafalaya River, this study incorporates a one-dimensional backwater flow model based on conservation of fluid mass and momentum equations and utilizes the geological and engineering data of the Atchafalaya, Mississippi and Old River Systems compiled by the USACE from 1880-1950. Two models were developed from 75 channel cross-sections measured during hydrographic surveys of the Atchafalaya Basin and river systems in 1916-17 and 1950, representing the pre-dredging and post-dredging conditions of the Atchafalaya River. A third model was adapted from the 1916-17 pre-dredging model and incorporates the dredging of a 4 meter deep channel from Morgan City, Louisiana to the headwaters of the Atchafalaya River at Simmesport, Louisiana. Based on this one-dimensional modeling approach, comparison of the 1916-17 Pre-Dredging (16%) and Proposed Dredging (26%) models of discharge partition percentages flowing into the Atchafalaya River from the Mississippi River indicates that dredging is potentially associated with an increase of Atchafalaya River flow partition discharge of +10% under 1916-17 historically measured discharge conditions of 18,000 (m3/s) total discharge above the bifurcation (TDAB). By comparison, the historically measured discharge partition percentages recorded by the USACE for 1916-17 (11%) at 18,000 (m3/s) TDAB and 1950 (22%) at 25,000 (m3/s) TDAB indicate a similar increase in discharge partitioning of +11% change between 1916-17 pre-dredging and 1950 post-dredging conditions. However, due to the limitations of the one-dimensional model to simulate flow through additional downstream bifurcations, further multi-dimensional analysis is needed before definite causation can be warranted. Advisors/Committee Members: John B. Shaw, Doy L. Zachry, Walter L. Manger.

Subjects/Keywords: Earth sciences; Atchafalaya river; Bifurcation; Channel avulsion; Dredging; Mississippi delta; One-dimensional flow model; Geology; Geomorphology; Hydrology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

McCain, G. W. (2016). Influences of Channel Dredging on Avulsion Potential at the Atchafalaya River. (Masters Thesis). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/1559

Chicago Manual of Style (16^th Edition):

McCain, Gordon William. “Influences of Channel Dredging on Avulsion Potential at the Atchafalaya River.” 2016. Masters Thesis, University of Arkansas. Accessed March 07, 2021. https://scholarworks.uark.edu/etd/1559.

MLA Handbook (7^th Edition):

McCain, Gordon William. “Influences of Channel Dredging on Avulsion Potential at the Atchafalaya River.” 2016. Web. 07 Mar 2021.

Vancouver:

McCain GW. Influences of Channel Dredging on Avulsion Potential at the Atchafalaya River. [Internet] [Masters thesis]. University of Arkansas; 2016. [cited 2021 Mar 07]. Available from: https://scholarworks.uark.edu/etd/1559.

Council of Science Editors:

McCain GW. Influences of Channel Dredging on Avulsion Potential at the Atchafalaya River. [Masters Thesis]. University of Arkansas; 2016. Available from: https://scholarworks.uark.edu/etd/1559

4. Gulliford, Alice Rachel. Controls on river and overbank processes in an aggradation-dominated system : Permo-Triassic Beaufort Group, South Africa.

Degree: PhD, 2014, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/controls-on-river-and-overbank-processes-in-an-aggradationdominated-system-permotriassic-beaufort-group-south-africa(63893677-9b23-4f07-8405-627354fb170a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632286

► The Permo-Triassic lower Beaufort Group fluvial deposits extend over 100s of kilometres within the Karoo Basin, South Africa. A detailed study of the depositional architecture… (more)

▼ The Permo-Triassic lower Beaufort Group fluvial deposits extend over 100s of kilometres within the Karoo Basin, South Africa. A detailed study of the depositional architecture and stacking patterns of sand bodies within a 900 m thick succession has enabled interpretation of the controls on ancient river channel and overbank processes. Facies include very fine- to medium-grained sandstone, intra-formational conglomerate, mudstone and palaeosols. Channel-belts are dominated by upper flow regime structures, consistent with a flashy to ephemeral fluvial system. The overbank deposits comprise splays interbedded with purple, green and grey mudstone; these floodplain colour changes signify water table fluctuations. A hierarchy of channel-related elements has been established that recognises beds, bedsets, storeys, channel-belts, complexes and complex sets. Each channel-belt may be single- or multi-storey, whereby one storey represents the complete cut and fill cycle of a single migrating river, comprising bar accretion elements and channel-abandonment fill. The abandonment fill elements often consist of heterolithic plugs of climbing ripple-laminated very fine-grained sandstone, or interbedded claystone with siltstone. The Beaufort channel-belts preserve either lateral- or downstream-accretion patterns, or a combination. Each belt has either a lenticular or tabular geometry, recognisable by an erosional base overlain by intra-formational conglomerate lag and barform deposits. Genetically related channel-belts cluster to form complexes, of which two broad styles have been identified: Type A) laterally and vertically stacked channel-belts, and Type B) sub-vertically stacked channel-belts. There is evidence of localised clustering of sub-vertically stacked channel-belts adjacent to extensive overbank mudstone deposits. The apparent lack of a well-defined ‘container’ surface with mappable margins, suggests that this stacked channel-belt architecture represents an avulsion complex rather than a palaeovalley-fill. The lateral and stratigraphic variability in fluvial-overbank architecture is interpreted as the interplay of several controls. Allogenic forcing factors include, tectonic subsidence that influences accommodation, sediment supply, and high frequency climate cycles associated with the flashy discharge regime and expressed in the mudrock colour changes and distribution of palaeosols. The depositional river style, variability in channel-belt stacking patterns and compensational stacking of some channel-belt/splay complexes is interpreted to be the result of autogenic channel avulsion, supported by an absence of significant erosion. The relative merits of basin-axial trunk river and distributive fluvial system (DFS) models are assessed from detailed architectural and stratigraphic outcrop studies.

Subjects/Keywords: 551.44; Beaufort Group; Lower Abrahamskraal Formation; Moordenaars Member; South Africa; Karoo Basin; Permo-Triassic; Fluvial; Hierarchy; Architecture; Channel-belt; Channel-belt Complex; Overbank; Aggradation; Crevasse splay deposit; Distributive fluvial system; Avulsion; Semi-arid; Ephemeral; Flashy discharge; Stratigraphy; Sedimentology; Geology

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APA (6^th Edition):

Gulliford, A. R. (2014). Controls on river and overbank processes in an aggradation-dominated system : Permo-Triassic Beaufort Group, South Africa. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/controls-on-river-and-overbank-processes-in-an-aggradationdominated-system-permotriassic-beaufort-group-south-africa(63893677-9b23-4f07-8405-627354fb170a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632286

Chicago Manual of Style (16^th Edition):

Gulliford, Alice Rachel. “Controls on river and overbank processes in an aggradation-dominated system : Permo-Triassic Beaufort Group, South Africa.” 2014. Doctoral Dissertation, University of Manchester. Accessed March 07, 2021. https://www.research.manchester.ac.uk/portal/en/theses/controls-on-river-and-overbank-processes-in-an-aggradationdominated-system-permotriassic-beaufort-group-south-africa(63893677-9b23-4f07-8405-627354fb170a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632286.

MLA Handbook (7^th Edition):

Gulliford, Alice Rachel. “Controls on river and overbank processes in an aggradation-dominated system : Permo-Triassic Beaufort Group, South Africa.” 2014. Web. 07 Mar 2021.

Vancouver:

Gulliford AR. Controls on river and overbank processes in an aggradation-dominated system : Permo-Triassic Beaufort Group, South Africa. [Internet] [Doctoral dissertation]. University of Manchester; 2014. [cited 2021 Mar 07]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/controls-on-river-and-overbank-processes-in-an-aggradationdominated-system-permotriassic-beaufort-group-south-africa(63893677-9b23-4f07-8405-627354fb170a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632286.

Council of Science Editors:

Gulliford AR. Controls on river and overbank processes in an aggradation-dominated system : Permo-Triassic Beaufort Group, South Africa. [Doctoral Dissertation]. University of Manchester; 2014. Available from: https://www.research.manchester.ac.uk/portal/en/theses/controls-on-river-and-overbank-processes-in-an-aggradationdominated-system-permotriassic-beaufort-group-south-africa(63893677-9b23-4f07-8405-627354fb170a).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632286

5. Guo, Xiwei. Morphodynamics of large anabranching rivers : the case of the Madeira River, Brazil.

Degree: MA, Geography, 2017, University of Texas – Austin

URL: http://hdl.handle.net/2152/63955

► Anabranching channels are the dominant channel pattern of large rivers worldwide. The top nine largest rivers of the world by water discharge, in particular, all… (more)

▼ Anabranching channels are the dominant channel pattern of large rivers worldwide. The top nine largest rivers of the world by water discharge, in particular, all develop anabranching channels. Given the limited understanding on large river morphodynamics and the mechanisms of formation and process of anabranching channels, this thesis focuses on elucidating the morphodynamic conditions of a 150-km channel segment of the Madeira River, the largest tributary of the Amazon River and the fourth or fifth largest river in the world with anabranching channels, by extensively using field measurement and remote sensing data. The studied river channels are divided into three reaches: 1) Box-shaped channels with upstream and downstream anabranching structures; 2) A pseudo-meander with a downstream anabranching structure; 3) A single-threaded straight channel with a downstream anabranching structure. The analysis of the spatial-temporal channel changes of the three reaches since 1985 demonstrates the slow process of channel lateral migration and the stability of large anabranching rivers. Besides three sites with special geomorphological settings, more than 87% of the channel analyzed did not have traceable lateral migration. The area being eroded and deposited stayed relatively equivalent until after 2010, in which channel incision (erosion) significantly exceeded the amount of deposition, possibly due to the closure of two large dams on the Madeira mainstem upstream. Channel morphology and flow scheme vary largely among different channel structures, while geologic controls play an important role in a number of places that result in channel deepening and suspension of channel migration. The three reaches are dominated by nearly upright banks, which makes the channel width stay constant with increasing discharge and impedes channel-floodplain interactions. Bed shear stress, stream power, and sediment transport are further analyzed and discussed. The hydro-geomorphological features of two anabranching structures, one in reach 2 and one in reach 3, each demonstrates floodplain avulsion (erosion-triggered) and in-channel accretion (deposition-triggered), which are the two mechanisms of anabranching channel formation. Advisors/Committee Members: Latrubesse, Edgardo (advisor).

Subjects/Keywords: Large rivers; Anabranching channels; Channel patterns; Morphodynamics; Amazon River; River morphodynamics; Madeira River; Channel lateral migration; Channel morphology; Channel erosion; Floodplain avulsion; In-channel accretion; Anabranching channel formation

…process of channel patterns, particularly of alluvial rivers, has been a fundamental issue in… …rivers continuously change the channel shape through the processes of erosion and deposition… …x28;Schumm, 1985; Latrubesse and Park, 2017). Alternations of channel patterns in a… …river and differences of channel patterns among various rivers indicate differences of… …not limited to, streamflow and sediment regime, grain size, channel morphology, slope…

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APA (6^th Edition):

Guo, X. (2017). Morphodynamics of large anabranching rivers : the case of the Madeira River, Brazil. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/63955

Chicago Manual of Style (16^th Edition):

Guo, Xiwei. “Morphodynamics of large anabranching rivers : the case of the Madeira River, Brazil.” 2017. Masters Thesis, University of Texas – Austin. Accessed March 07, 2021. http://hdl.handle.net/2152/63955.

MLA Handbook (7^th Edition):

Guo, Xiwei. “Morphodynamics of large anabranching rivers : the case of the Madeira River, Brazil.” 2017. Web. 07 Mar 2021.

Vancouver:

Guo X. Morphodynamics of large anabranching rivers : the case of the Madeira River, Brazil. [Internet] [Masters thesis]. University of Texas – Austin; 2017. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/2152/63955.

Council of Science Editors:

Guo X. Morphodynamics of large anabranching rivers : the case of the Madeira River, Brazil. [Masters Thesis]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/63955

6. Gulliford, Alice Rachel. CONTROLS ON RIVER AND OVERBANK PROCESSES IN AN AGGRADATION-DOMINATED SYSTEM: PERMO-TRIASSIC BEAUFORT GROUP, SOUTH AFRICA.

Degree: 2014, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:240756

►

The Permo-Triassic lower Beaufort Group fluvial deposits extend over 100s of kilometres within the Karoo Basin, South Africa. A detailed study of the depositional architecture… (more)

▼

The Permo-Triassic lower Beaufort Group fluvial deposits extend over 100s of kilometres within the Karoo Basin, South Africa. A detailed study of the depositional architecture and stacking patterns of sand bodies within a 900 m thick succession has enabled interpretation of the controls on ancient river channel and overbank processes. Facies include very fine- to medium-grained sandstone, intra-formational conglomerate, mudstone and palaeosols. Channel-belts are dominated by upper flow regime structures, consistent with a flashy to ephemeral fluvial system. The overbank deposits comprise splays interbedded with purple, green and grey mudstone; these floodplain colour changes signify water table fluctuations.A hierarchy of channel-related elements has been established that recognises beds, bedsets, storeys, channel-belts, complexes and complex sets. Each channel-belt may be single- or multi-storey, whereby one storey represents the complete cut and fill cycle of a single migrating river, comprising bar accretion elements and channel-abandonment fill. The abandonment fill elements often consist of heterolithic plugs of climbing ripple-laminated very fine-grained sandstone, or interbedded claystone with siltstone. The Beaufort channel-belts preserve either lateral- or downstream-accretion patterns, or a combination. Each belt has either a lenticular or tabular geometry, recognisable by an erosional base overlain by intra-formational conglomerate lag and barform deposits.Genetically related channel-belts cluster to form complexes, of which two broad styles have been identified: Type A) laterally and vertically stacked channel-belts, and Type B) sub-vertically stacked channel-belts. There is evidence of localised clustering of sub-vertically stacked channel-belts adjacent to extensive overbank mudstone deposits. The apparent lack of a well-defined ‘container’ surface with mappable margins, suggests that this stacked channel-belt architecture represents an avulsion complex rather than a palaeovalley-fill.The lateral and stratigraphic variability in fluvial-overbank architecture is interpreted as the interplay of several controls. Allogenic forcing factors include, tectonic subsidence that influences accommodation, sediment supply, and high frequency climate cycles associated with the flashy discharge regime and expressed in the mudrock colour changes and distribution of palaeosols. The depositional river style, variability in channel-belt stacking patterns and compensational stacking of some channel-belt/splay complexes is interpreted to be the result of autogenic channel avulsion, supported by an absence of significant erosion. The relative merits of basin-axial trunk river and distributive fluvial system (DFS) models are assessed from detailed architectural and stratigraphic outcrop studies.

CD containing photo panel interpretations from eight field localities.

N/A

Advisors/Committee Members: Flint, Stephen.

Subjects/Keywords: Beaufort Group; Lower Abrahamskraal Formation; Moordenaars Member; South Africa; Karoo Basin; Permo-Triassic; Fluvial; Hierarchy; Architecture; Channel-belt; Channel-belt Complex; Overbank; Aggradation; Crevasse splay deposit; Distributive fluvial system; Avulsion; Semi-arid; Ephemeral; Flashy discharge; Stratigraphy; Sedimentology; Geology

…autogenic channel avulsion, supported by an absence of significant erosion. The relative merits of… …sandstone, and provide insights into the avulsion style of channel-belts. The high resolution… …insight into channel-belt avulsion style. Chapter 7.— Synthesis, implications and future work… …55 Fig. 1.11. Fluvial channel patterns and dimensions vary with changing bankfull discharge… …61 Fig. 1.12. Three-stage development of a river avulsion from a splay…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gulliford, A. R. (2014). CONTROLS ON RIVER AND OVERBANK PROCESSES IN AN AGGRADATION-DOMINATED SYSTEM: PERMO-TRIASSIC BEAUFORT GROUP, SOUTH AFRICA. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:240756

Chicago Manual of Style (16^th Edition):

Gulliford, Alice Rachel. “CONTROLS ON RIVER AND OVERBANK PROCESSES IN AN AGGRADATION-DOMINATED SYSTEM: PERMO-TRIASSIC BEAUFORT GROUP, SOUTH AFRICA.” 2014. Doctoral Dissertation, University of Manchester. Accessed March 07, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:240756.

MLA Handbook (7^th Edition):

Gulliford, Alice Rachel. “CONTROLS ON RIVER AND OVERBANK PROCESSES IN AN AGGRADATION-DOMINATED SYSTEM: PERMO-TRIASSIC BEAUFORT GROUP, SOUTH AFRICA.” 2014. Web. 07 Mar 2021.

Vancouver:

Gulliford AR. CONTROLS ON RIVER AND OVERBANK PROCESSES IN AN AGGRADATION-DOMINATED SYSTEM: PERMO-TRIASSIC BEAUFORT GROUP, SOUTH AFRICA. [Internet] [Doctoral dissertation]. University of Manchester; 2014. [cited 2021 Mar 07]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:240756.

Council of Science Editors:

Gulliford AR. CONTROLS ON RIVER AND OVERBANK PROCESSES IN AN AGGRADATION-DOMINATED SYSTEM: PERMO-TRIASSIC BEAUFORT GROUP, SOUTH AFRICA. [Doctoral Dissertation]. University of Manchester; 2014. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:240756

7. D'Souza, Danfix Cyriaco 1988-. Facies Architecture, and Controls on Channel-belt Geometry: Cretaceous-Ferron Notom Delta, Utah, U.S.A.

Degree: MS, Geology, 2013, University of Houston

URL: http://hdl.handle.net/10657/401

► Examination of fluvial deposits of the Late Cretaceous (Turonian) Ferron Sandstone Member, within the Mancos Shale Formation, in Central Utah (along Sweetwater Wash) was done… (more)

▼ Examination of fluvial deposits of the Late Cretaceous (Turonian) Ferron Sandstone Member, within the Mancos Shale Formation, in Central Utah (along Sweetwater Wash) was done to interpret fluvial style, characterize avulsion, and better constrain controls on channel-belt geometry. Cross sections were created based on measured sections and walking out beds, and showed two highly amalgamated sheet sands (Channel-belt A&C) separated by floodplain-encased channel-belts (isolated Channel-belt group B). The extensive sheet sandstones overlie distal floodplain deposits, and were subsequently characterized as regional avulsions. The isolated channel-belts overlie more proximal lacustrine and floodplain deposits, and were characterized as local avulsions. Detailed analysis of Channel-belt C showed a laterally extensive, unconfined channel-belt, formed by rivers 2.5-4 meters deep, with average storeys of 1.8 meters and bar lengths between 150-190 meters. Consistent paleo-current directions, evidence of downstream accretion, and a confluence zone, in highly scoured sheet-like deposits, suggest the deposition of Channel-belt C by a dominantly braided river. Correlation to a previously developed sequence stratigraphic framework showed that base level is an allocyclic control on alluvial architecture, with possible glacio-eustatic cycles controlling the regional stratigraphy. Channel-belt clusters were observed within the isolated channel-belts, but were not uniform across the basin, so they were interpreted as autocyclic or random, and not related to incised valleys below. Evidence for autocyclic controls, such as substrate erodability, was documented with laterally continuous indurated coals favoring extensive channel migration and the deposition of vi sheet sands. Sandy substrates favored channel reoccupation and vertical amalgamation. Comparing my data to net-to-gross models showed that the high net-to-gross and highly amalgamated deposits of the lower Channel-belt C are mainly associated with braided rivers, whereas meandering rivers are dominant in the low net-to-gross deposits of the isolated channel-belts; thus showing some similarities to previous net-to-gross models. Advisors/Committee Members: Bhattacharya, Janok P. (advisor), Dupré, William R. (committee member), Cleveland, David M. (committee member).

Subjects/Keywords: Fluvial style; Fluvial systems; Characterize avulsion; Controls on channel-belt geometry; Confluence zone; Confluence scour; Braided river; Allocyclic control; Autocyclic control; Substrate erodability; Net-to-gross models; Facies architecture; Ferron Notom Delta; Ferron; Geology

…74 4.2.1 Aggradation, channel migrations, and avulsion �� …... ��74 vii 4.2.2 Channel-belt… …function of aggradation rate, channel migration and avulsion frequency… …of channel avulsion and through experiments and outcrop analysis, they propose purely… …facies architecture, avulsion styles, and controls on Channel-belt C. - 18 - - 19 - NW SE… …Bedding architecture interpretation �� ..45 3. PALEO-RECONSTRUCTION OF CHANNEL-BELT…

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APA (6^th Edition):

D'Souza, D. C. 1. (2013). Facies Architecture, and Controls on Channel-belt Geometry: Cretaceous-Ferron Notom Delta, Utah, U.S.A. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/401

Chicago Manual of Style (16^th Edition):

D'Souza, Danfix Cyriaco 1988-. “Facies Architecture, and Controls on Channel-belt Geometry: Cretaceous-Ferron Notom Delta, Utah, U.S.A.” 2013. Masters Thesis, University of Houston. Accessed March 07, 2021. http://hdl.handle.net/10657/401.

MLA Handbook (7^th Edition):

D'Souza, Danfix Cyriaco 1988-. “Facies Architecture, and Controls on Channel-belt Geometry: Cretaceous-Ferron Notom Delta, Utah, U.S.A.” 2013. Web. 07 Mar 2021.

Vancouver:

D'Souza DC1. Facies Architecture, and Controls on Channel-belt Geometry: Cretaceous-Ferron Notom Delta, Utah, U.S.A. [Internet] [Masters thesis]. University of Houston; 2013. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10657/401.

Council of Science Editors:

D'Souza DC1. Facies Architecture, and Controls on Channel-belt Geometry: Cretaceous-Ferron Notom Delta, Utah, U.S.A. [Masters Thesis]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/401

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