Sediment Flux Source-To-Sink

2012 ◽  
Keyword(s):  
Sediment Flux ◽  
Source To Sink

scholarly journals Did the last sea level lowstand always lead to cross-shelf valley formation and source-to-sink sediment flux?

2006 ◽  
Vol 111 (F4) ◽  
Author(s):  
Torbjörn E. Törnqvist ◽  
Santina R. Wortman ◽  
Zenon Richard P. Mateo ◽  
Glenn A. Milne ◽  
John B. Swenson
Keyword(s):  
Sea Level ◽  
Sediment Flux ◽  
Source To Sink

scholarly journals Theoretical Interpretation of the Exceptional Sediment Transport of Fine-grained Dispersal Systems Associated with Bedform Categories

2018 ◽  
Author(s):  
Tian Zhao ◽  
Qian Yu ◽  
Yunwei Wang ◽  
Shu Gao
Keyword(s):  
Sediment Transport ◽  
Regime Shift ◽  
Sedimentary Environment ◽  
Sediment Flux ◽  
Theoretical Interpretation ◽  
Fine Grained ◽  
Transport Regime ◽  
Source To Sink ◽  
Bed Roughness ◽  
Set Up

Abstract. Being a widespread source-to-sink sedimentary environment, the fine-grained dispersal system (FGDS) features remarkably high sediment flux, interacting closely with local morphology and ecosystem. Such exceptional transport is believed to be associated with changes in bedform geometry, which further demands theoretical interpretation. Using van Rijn (2007a) bed roughness predictor, we set up a simple numerical model to calculate sediment transport, classify sediment transport behaviors into dune and (mega-)ripple dominant regimes, and discuss the causes of the sediment transport regime shift linked with bedform categories. Both regimes show internally consistent transport behaviors, and the latter, associated with FGDSs, exhibits considerably higher sediment transport rate than the previous. Between lies the coexistence zone, the sediment transport regime shift accompanied by degeneration of dune roughness, which can considerably reinforce sediment transport and is further highlighted under greater water depth. This study can be applied to modeling of sediment transport and morphodynamics.

scholarly journals Landscape responses to dynamic topography and climate change on the South African source-to-sink system since the Oligocene

2021 ◽  
Author(s):  
Claire A. Mallard ◽  
Tristan Salles
Keyword(s):  
South African ◽  
Large Scale ◽  
Sedimentary Basin ◽  
Drainage System ◽  
Sediment Flux ◽  
Mantle Flow ◽  
Dynamic Topography ◽  
The South ◽  
Source To Sink ◽  
Underlying Mechanisms

Abstract. The South African landscape displays important lithological and topographical heterogeneities between the eastern, western margins and the plateau. Yet the underlying mechanisms and timings responsible for this peculiar layout remain unclear. While studies have proposed a post-Gondwana uplift driver, others have related these heterogeneities to a more recent evolution induced by deep mantle flow dynamics during the last 30 million years. This theory seems supported by the rapid increase of sediment flux in the Orange basin since the Oligocene. However, the triggers and responses of the South African landscape to dynamic topography are still debated. Here we use a series of numerical simulations forced with Earth data to evaluate the contribution of dynamic topography and precipitation on the Orange river source-to-sink system since the Oligocene. We show that, if the tested uplift histories influence deposits distribution and thicknesses in the Orange sedimentary basin, they poorly affect the large-scale drainage system organisation and only strongly impact the erosion across the catchment for two of the four tested dynamic topography cases. Conversely, it appears that paleo-rainfall regimes are the major forcing mechanism that drives the recent increase of sediment flux in the Orange basin. From our simulations, we find that climate strongly smoothed the dynamic topography signal in the South African landscape and that none of the currently proposed dynamic topography scenarios produce an uplift high enough to drive the pulse of erosion and associated sedimentation observed during the Palaeocene. These findings support the hypothesis of a pre-Oligocene uplift. Our results are crucial to improve our understanding of the recent evolution of the South African landscape.

Sediment flux across the south-Pyreneean foreland basin. A contribution to the S2S-Future network. 

2021 ◽  
Author(s):  
Philémon Juvany ◽  
Miguel Garcés
Keyword(s):  
Foreland Basin ◽  
Sediment Flux ◽  
Provenance Analysis ◽  
The South ◽  
Flexural Response ◽  
Eastern Pyrenees ◽  
Sediment Routing ◽  
Sedimentary Provenance ◽  
Source To Sink ◽  
Volumetric Quantification

<div> </div><div> <p>The early Eocene was a period of the intense collision during the formation of the Pyrenees. The flexural response to loading of the overriding European plate led to the formation of an elongated foredeep on the subducting Iberian plate which connected westward to the Atlantic Ocean. A thrust salient formed in the central Pyrenees, where Mesozoic Cover units travelled southwards on top of Triassic salt detachment. This process resulted in the sequencing of the foreland basin in different isolated sub-basins such as the Ripoll basin in the East, the Tremp-Graus and Ainsa-Jaca basins in central and western south Pyrenees and the Ager basin located south of the Tremp-Graus basin.  The precise timing and surface processes associated to this reorganization of the sedimentary routing system remains not totally understood. Indeed, various sedimentary provenance studies show that the sediments of the Tremp-Graus basin were sourced from a different catchment zone than those of the Ager basin. Besides, the Ripoll basin sediments provenance analysis shows major similarities with the Ager basin, suggesting a common catchment area in the Eastern Pyrenees. However, it has been pointed out that the clastic systems feeding the rapidly subsiding sink of the Ripoll through could not find their way towards the shallower Ager basin. In this PhD project we aim at providing further constraints to the paleogeographic reconstruction and sediment routing systems of the South Eastern Pyrenees in the light of a revised chronostratigraphic scheme. A Source-to-Sink approach will be followed to study the sediment Routing Systems and to decode the climatic and tectonic signal from the sedimentary record. It will follow a volumetric quantification of the sediment budget over the entire foreland, and a comparison with eroded rock volumes of the whole Pyrenees. The resulting revised scenario will seek conciliation of all available data from the stratigraphic, structural, petrologic, geochronologic and sedimentologic datasets with new radiogenic isotopes sedimentary provenance analysis.  </p> </div>

Source-to-Sink Systems in the Central Atlantic: Cretaceous Climate Transitions and the Consequences for Reservoir Distribution

2020 ◽  
Author(s):  
Graeme Nicoll ◽  
Joss Smith ◽  
Benjamin Gréselle
Keyword(s):  
Global Scale ◽  
Sediment Flux ◽  
Data Sets ◽  
Sequence Stratigraphic ◽  
Source To Sink ◽  
Digital Elevation ◽  
Wide Range ◽  
Potential Reservoir ◽  
Environment Maps ◽  
Central Atlantic

<p>In frontier settings where data are limited or nonexistent, exploration often relies on predictive models to define uncertainty and derisk decisions. However, helping predict the spatial and temporal extent of geological elements in ancient systems is often challenging and requires a combined multidisciplinary methodology and mindset. The benefits of following a holistic Earth system science approach to the global-scale prediction of petroleum system elements are discussed.</p><p>Building on spatial and temporal frameworks provided by plate tectonic and sequence stratigraphic modelling, palinspastic gross depositional environment maps can be integrated with numerous data sets to generate useful paleo-digital elevation models (PDEM) for discrete time slices of the Earth’s history. With a reliable depiction of ancient landscapes and bathymetry, these global PDEMs are instrumental in identifying sediment source areas, which facilitates modelling of paleodrainage pathways. These PDEMs form an essential input to run global paleoclimate and paleotidal simulations, which, in turn, provide a wide range of useful parameters. In combination, paleodrainage and paleoclimate outputs allow for a predictive source-to-sink approach, which provides useful insights away from data constraints.</p><p>To highlight the predictive capabilities of this approach, the focus is on the Cretaceous paleo-margin from Guyana in northeast South America to Morocco in northwest Africa. The generation, quality, and distribution of clastic and carbonate systems related to the changing geomorphological and climatic evolution of the central Atlantic domain are discussed.</p><p>Within this prospective region, climatic trends are demonstrated (i.e., an intensification of precipitation along the equatorial margin and a progressive aridification in northern Africa) and their implications are discussed. For a range of Cretaceous time-slices, predictions of sediment flux, submarine fan dimensions, and hinterland composition, which provide useful insight into potential reservoir extent and quality along this margin, are demonstrated. By integrating climate, sediment flux, and sediment composition predictions, a margin-wide screening for clastic reservoir potential highlighting areas where existing plays could be extended (MSGBC) and where climatic controls add significant potential risk to reservoir presence and quality (Morocco) are presented.</p>

scholarly journals Testing the Prediction Ability of LEM-Derived Sedimentary Budget in an Upland Catchment of the Southern Apennines, Italy: A Source to Sink Approach

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 911 ◽  
Author(s):  
Gioia ◽  
Lazzari
Keyword(s):  
Sediment Flux ◽  
Southern Apennines ◽  
Short Term ◽  
Prediction Ability ◽  
Small Catchment ◽  
Bathymetric Survey ◽  
Landscape Modification ◽  
Source To Sink ◽  
Natural Landscapes ◽  
Sedimentary Budget

Landscape evolution models (LEMs) represent one of the most promising approaches to evaluate sedimentary budget, although factors such as the high number of parameters or the difficulty evaluating the robustness of the results can represent a limitation in their application in natural landscapes. In this paper, the Caesar–Lisflood LEM has been applied in a small catchment (i.e., about 9 km2) of southern Italy draining an artificial reservoir in order to test its ability to predict sediment flux and erosion rate. Short-term (i.e., about 20 years) estimation of the sediment volumes accumulated in the reservoir has been reconstructed by a bathymetric survey and compared to the results coming from the coeval LEM simulations. Results indicate a good accordance between LEM-based erosion volume estimations and direct sedimentation assessment, thus testifying to the high potential of such models to solve issues of sedimentary budget and short-term landscape modification.

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