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About 2,841 papers for “Progradation”

PROGRADATION

John A. Matthews · Encyclopedia of Environmental Change · 2014

Cited by 0

Progradation and Retrogradation of Carbonate Platforms

John J. G. Reijmer · AAPG Bulletin · 1993

We have analyzed two data sets in order to establish the relationship between the production of sediments on the carbonate platform top and the progradation/retrogradation of the platform as registered at the toe-of-slope. The first data set consists of four Triassic sections (Pico di Vallandro/Durrenstein, Dolomites, Italy). During both progradation and retreat of the toe-of-slope, the platform sheds silt- to boulder-size debris. Sand to granule material is more common during progradation and mud and rubble are most common during retrogradation. The retreating units show more oncoids and ooids as well as an increased input of filaments, radiolarians, and carbonate mud. The second data set concerns three successions of the Vercors carbonate platform (Cretaceous, southeast France). This platform sheds silt- to pebble-sized material during both progradation and retreat. Compared to the prograding units, the retreating units contain more peloids, grapestones, and micritic ooids, and less margin-derived skeletal grains. In both case studies, geometric relationships show that the carbonate platform was at least intermittently flooded during both progradation and retrogradation at the toe-of-slope. However, the observed differences in sediment composition may suggest that during retreating phases the platforms were slightly deeper and had less-developed marginal reefs or sand shoals. Toe-of-slope geometries maymore » be indicative of the environmental conditions and sea level stand on carbonate platforms.« less

Cited by 0

Progradation on E. coast Fla.; decades

Richard Miller Davis, University of South FloridaTampa Campus Library · Digital Commons - University of South Florida (University of South Florida) · 2022

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Progradation on East Coast of Florida, B

Davis, Richard A. · Digital Commons - University of South Florida (University of South Florida) · 1977

https://digitalcommons.usf.edu/davis_coastal/1683/thumbnail.jpg

Cited by 0

Modes of holocene coastal progradation : Gulf of Carpentaria

Eugene G. Rhodes · ANU Open Research (Australian National University) · 1980

Chenier and beach-ridge plains are both examples of prograded coasts, and various models have been proposed for their development• In the case of the chenier plain, the Louisiana coast has provided the prime example where deposition is linked to variation in sediment supply from the Mississippi delta. The study of beach-ridge plains has been more widespread, although Galveston Island and the Nayarit (Mexico) examples have been important in the understanding of such coasts. In most examples of prograded coasts, relative sea level and climatic change have been suggested as important factors controlling coastal deposition• Holocene chenier and beach-ridge plains in the Gulf of Carpentaria, a shallow epi-continental sea in northern Australia, exhibit a wide range of depositional environments distributed over broad coastal plains. The depositional environments produce distinctive facies which are preserved in the stratigraphy of the prograded coast. Some of these facies have a well defined relationship to sea level, and also contain datable shells. Therefore, a record of upper Holocene sea level changes remain preserved in the morphostratigraphic record of these prograded plains. Relative sea level change during the last 6000 radiocarbon years has been different for the chenier and beach-ridge plains. The chenier plain, which occurs on the southern margin of the Gulf, shows a relative fall of 2.4m since the mid-Holocene. In contrast, the beach-ridge plain, on the eastern margin of the Gulf, has experienced only l.5m of fall during the same period. These differences appear attributable to hydro-isostatic response to water loading of the continental shalf during and after the Postglacial Marine Transgression. Coastal deposition since the mid-Holocene has occurred in an episodic manner on both the chenier and beach-ridge plains. The modes of deposition are different with mudflats constructed on the chenier plain and beach ridges developed on the beach-ridge plain during periods of high terrigenous input. During periods of lower terrigenous input, cheniers are constructed on the chenier plain whilst a period of non-deposition occurs on the beach-ridge plain· In the Gulf of Carpentaria, such a variation in sediment supply has occurred at least four times since 6000 years B.P. In areas outside the Gulf of Carpentaria, similar episodic phenomenon can be shown in areas such as Broad Sound, Queensland, where sufficient radiocarbon dates have been obtained on coastal sediments. Climatic change in the form of variation in rainfall. intensity (or storminess) is suggested as the forcing function in this model. At present, insufficient data on upper Holocene climatic change exist within Australia for regional correlation of such events. However, there appears to be a correlation between progradation of the beach-ridge plain during the period 6000-4800 years B.P. and increased cyclogenesis accompanied by a pluvial in eastern and southern Australia· On a global scale, glacial advances in the northern hemisphere also appear to be in phase with this increase of sediment supply to the Gulf of Carpentaria· Furthermore, there is a general agreement between a wetter period in southern Australia after 2000 years B.P. and a long stage of beach-ridge. progradation in the Gulf of Carpentaria during the time 2300-600 years B. P.

Cited by 41Open access

Mud-Dominated Basin-Margin Progradation: Processes and Implications

Miquel Poyatos‐Moré, George Jones, Rufus L. Brunt et al. · Journal of Sedimentary Research · 2016

The accretion of coarse-grained material at the shelf-edge rollover has been emphasized in studies of basin margin progradation, despite fine grained sediment (clay and silt) representing a volumetrically more significant component of subaqueous clinothems.The timing and processes of fine-grained sediment transport across the shelf and onto the slope remains an understudied facet of sedimentary basin stratigraphy.Three exhumed basin margin-scale clinothems of the Permian Waterford Formation, in the Karoo Basin, South Africa, offer outcrop examples of margin development through the accretion of mud during flooded shelf conditions.The progradation of wave/storm-influenced sandy shelf topset deposits over a thick mudstone succession and beyond a previously established sand-rich shelf-edge rollover suggests that some periods of basin margin progradation took place exclusively via dilute mud-rich gravity flows.Detailed outcrop and core study of offshore mudstones reveals a high content of organic debris and mica.Individual beds show normal and inverse grading, internal erosion surfaces and moderate to low bioturbation, reflecting relatively stressed conditions in frequently supplied outer shelf to upper slope regions.The estimated low gradient (<0.7º) of the Karoo Basin margin and prevailing wave/storm conditions facilitated prolonged suspension of fluid mud and transport across the shelf and beyond the shelf-edge rollover in sediment gravity flows.This study represents a rare example of mudstone-dominated shelf-edge rollover deposits documented at outcrop and core, and demonstrates how fine-grained sediment accretion can play a significant role in basin margin progradation.Conventional depositional models

Cited by 55

Modelling deltaic progradation constrained by a moving sediment source

Hsi-Heng Dai, R. Fernandez, Gary Parker et al. · Journal of Hydraulic Research · 2013

A physically-based moving boundary model of deltaic progradation is developed. Surface of the axially symmetric, inner delta is free to grow or shrink in time, while the sediment source is allowed to migrate along the streamwise direction. Particularly, the model developed here captures the control of a downstream migrating sediment source on a lateral extent of the delta. Along this line, the modelling results provide insight into the sedimentation processes associated with elongated fan–delta systems. Further calculations allow to determining the influence of ratio between water and sediment discharges on delta morphology. The model uses appropriately the laboratory observations described in a companion paper.

Cited by 2

Attenuation of Hydro‐Sediment Dynamics Progradation Over Mangrove Wetland

Wenting Jiang, Zuming Huang, Zhijun Dai et al. · Journal of Geophysical Research Oceans · 2025

Abstract Mangrove wetlands are one of the vital ecological resources that effectively trap sediment and attenuate the dynamic of waves and currents, thus protecting coastal areas from the onslaught of typhoons. Despite their importance, there is a dearth of knowledge regarding how mangrove dynamics influence hydro‐sediment dynamics and dissipation effects. Here, the wave, current, and sediment data, along with sediment particle size and mangrove vegetation parameters are used to analyze the variation of hydro‐sediment dynamics along the mangrove wetland. Our findings reveal that bottom flow velocities exhibit a continuous clockwise dispersion in a disordered pattern from the bare flats into the mangrove interior, influenced by the increasing density of mangroves. Furthermore, the hydro‐sediment elements exhibit pronounced tidal asymmetry, with the values of bottom velocity, suspended sediment concentration, and suspended sediment flux (SSF) shifting from being higher during flood tides to being higher during ebb tides due to tidal motion. Meanwhile, we found that the SSF at the mangrove edge may be the main source of the elevation changes at the mangrove interior. The vertical structure of Aegiceras corniculatum significantly affects sediment transport, with a notable decrease in SSF in areas with dense canopies. This study contributes to the body of knowledge on mangrove dynamics and their impact on sediment transport and hydro‐sediment damping, providing valuable insights for mangrove conservation and restoration efforts.

Cited by 5

REMOTE SENSING OF DELTA PROGRADATION IN MAHANADI DELTA, ORISSA

K. Vinod Kumar, Asis Bhattacharya · Journal of the Geological Society of India · 2004

Mahanadi Delta is a complex delta formed due to the coalescence of three sub–deltas. The northern portion of the delta i.e. Brahmani-Baitarani river mouth was monitored using 1RS-1C LISS-3 satellite data. Barrier–Lagoon type of progradation was brought out by digitally enhancing the satellite data. Density slicing technique was employed to understand the sediment diffusion pattern. This was compared with the standard distribution pattern to understand the nature of dispersal mechanism near the river mouth here.

Cited by 5Open access

Influence of suspended sediment concentration on hyperpycnal delta progradation

Yi-Yun Liang, Chiun-Chau Su, Hervé Capart · 2023

When rivers with high suspended sediment load plunge into lakes and reservoirs, the resulting density currents often cause the formation and progradation of hyperpycnal deltas. Suspended load can contribute to delta progradation through two different mechanisms: (1) indirectly, by increasing the excess density of the underflows, thus enhancing the basal shear stresses that drive along-bed transport; (2) directly, by settling out of suspension onto the evolving bed. In this work, we conducted laboratory experiments designed to investigate the relative importance of these two mechanisms, aided by a conceptual model that includes both processes. The experiments are conducted in a narrow tank of constant slope, supplied with prescribed water, sediment, and/or saline influxes. Both suspended sediment load and salinity can therefore contribute independently to the excess density of the inflow. Simultaneous measurements of delta profile evolution and suspended sediment concentration are then acquired using imaging methods. To interpret the results, we construct a simplified one-dimensional model of delta progradation in which along-bed transport is modelled as a diffusion process, and suspended sediment settling as an advection-deposition process. We then examine the influence of process coefficients on the morphology and rate of evolution of the delta fronts and compare simulations with the experiments. It is found that the evolution of the bed profile alone is not sufficient to distinguish between the two mechanisms, hence the importance of simultaneously measuring suspended sediment concentration. Although obtained in a simplified setting and at reduced scale, the results should provide useful guidance for the modeling and monitoring of reservoir sedimentation at field scales.

Cited by 0Open access