Conceptual assessment of (dis)connectivity and its application to the Ganga River dispersal system

Jain, Vikrant; Tandon, S. K.

doi:10.1016/j.geomorph.2010.02.002

Cited by 71 publications

(73 citation statements)

References 66 publications

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“…Energy input to the system causes sediment detachment and sediment transport, with the system becoming fully connected during the episodic event (Jain and Tandon, 2010), following which sediment connectivity returns to baseline levels.…”

Section: Frequency-magnitude Distributions Of Sediment Detachment Andmentioning

confidence: 99%

“…A major limitation of previous discussions of 'connectivity' is an unclear definition of the meaning of the term within the context in which it is used (Bracken et al, 2013). In a geomorphic system, connectivity may occur through the physical contact between two zones, through the transfer of material between zones, or both (Jain and Tandon, 2010). Thus, we perceive coupling (based on the morphologic system at certain locations) and sediment connectivity (founded on the continuum of the cascading system) to be different and encourage researchers to use the terms more precisely.…”

Section: Introductionmentioning

confidence: 99%

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Sediment connectivity: a framework for understanding sediment transfer at multiple scales

Bracken

Turnbull

Wainwright

et al. 2014

Earth Surf Processes Landf

426

379

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(2015) 'Sediment connectivity : a framework for understanding sediment transfer at multiple scales.', Earth surface processes and landforms., 40 (2). pp. 177-188. Further information on publisher's website:http://dx.doi.org/10.1002/esp.3635Publisher's copyright statement: This is the accepted version of the following article: Bracken L. J., Turnbull L., Wainwright J. and Bogaart P. (2015), Sediment connectivity: a framework for understanding sediment transfer at multiple scales, Earth Surface Processes and Landforms, 40 (2): 177188, which has been published in nal form at http://dx.doi.org/10.1002/esp.3635. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACTA major challenge for geomorphologists is to scale up small-magnitude processes to produce landscape form, yet existing approaches have been found to be severely limited. New ways to scale erosion and transfer of sediment are thus needed. This paper evaluates the concept of sediment connectivity as a framework for understanding processes involved in sediment transfer across multiple scales. We propose that the concept of sediment connectivity can be used to explain the connected transfer of sediment from a source to a sink in a catchment, and movement of sediment between different zones within a catchment: over hillslopes, between hillslopes and channels, and within channels. Using fluvial systems as an example we explore four scenarios of sediment-connectivity which represent end-members of behaviour from fully linked to fully unlinked hydrological and sediment connectivity. Sediment-travel distance -when combined with an entrainment parameter reflecting the frequency-magnitude response of the system -maps onto these end-members, providing a coherent conceptual model for the upscaling of erosion predictions. This conceptual model could be readily expanded to other process domains to provide a more comprehensive underpinning of landscape-evolution models. Thus, further research on the controls and dynamics of travel distances under different modes of transport is fundamental.

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Section: Frequency-magnitude Distributions Of Sediment Detachment Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sediment connectivity: a framework for understanding sediment transfer at multiple scales

Bracken

Turnbull

Wainwright

et al. 2014

Earth Surf Processes Landf

426

379

View full text Add to dashboard Cite

show abstract

“…Four sedimentological connectivities can be recognized depending on the temporal and spatial scale: (1) short time and small space connectivity; (2) long time and large space connectivity; (3) short time and large space connectivity; and (4) long time and small space connectivity (Jain and Tandon, 2010). In this study, the catchment area is considered to be small (54.2 km 2 ) and intense storms are one of the main contributors to the variation in the rate of soil erosion (Jiao et al, 1999).…”

Section: Scale Issuesmentioning

confidence: 99%

“…While structural connectivity delineates the contiguity or physical linkage of landscape elements Tischendorf and Fahrig, 2000), functional connectivity is indicative of the sediment flow between landscape compartments. Therefore, the physical contact status and sediment transfer among landscape compartments are some of the criteria used to categorize sedimentological connectivity (Jain and Tandon, 2010) and are the basis for measuring connectivity (Borselli et al, 2008;Heckman and Schwanghart, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Physical coupling and the amount of sediment transfer between sources and sinks are the two key aspects of sedimentological connectivity (Jain and Tandon, 2010). However, the connectivity indices are mostly not involved in sediment flux quantification, and may therefore omit some meaningful information, such as the dynamic response of a system (Wainwright et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Assessing sedimentological connectivity using WATEM/SEDEM model in a hilly and gully watershed of the Loess Plateau, China

Liu

2016

Ecological Indicators

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a b s t r a c tSedimentological connectivity is an important issue in soil erosion and sediment transport. Landscape patterns, in combination with the rainfall regime, are known to shape such sedimentological connectivity. The quantification of sedimentological connectivity provides a link between sediment delivery and landscape pattern. There are two categories of connectivity: structural connectivity, which describes the physical coupling of landscape units, and functional connectivity, which delineates the linkage among landscape elements maintained by material transport. To quantify sedimentological connectivity, both the physical coupling of, and material transfer between, the various landscape components need to be assessed. This study quantifies the sedimentological connectivity of a headwater catchment in the Loess Plateau of China using the soil erosion and sediment delivery model (WATEM/SEDEM). Based on the model, two indicators of connectivity were developed: the area of sedimentologically effective catchment area (SEA) that contributes sediment to the sinks, and the minimum sediment output of locations on the flow path that link sources and sinks. This approach effectively represents the annual status of catchment-scale sedimentological connectivity and, furthermore, the simple structure and readily available input data make it highly practicable. However, for larger river systems in which sediment transport between sources and sinks occur over longer time scales and larger spatial scales, we suggest different techniques for quantifying the sediment flux and parameters delineating the physical coupling of landscape units.

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Tracking multiple sediment cascades at the river network scale identifies controls and emerging patterns of sediment connectivity

Schmitt

Bizzi

Castelletti

2016

Water Resources Research

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Sediment connectivity in fluvial networks results from the transfer of sediment between multiple\ud sources and sinks. Connectivity scales differently between all sources and sinks as a function of distance,\ud source grain size and sediment supply, network topology and topography, and hydrologic forcing. In this\ud paper, we address the challenge of quantifying sediment connectivity and its controls at the network scale.\ud We expand the concept of a single, catchment-scale sediment cascade toward representing sediment transport\ud from each source as a suite of individual cascading processes. We implement this approach in the\ud herein presented CAtchment Sediment Connectivity And DElivery (CASCADE) modeling framework. In CASCADE,\ud each sediment cascade establishes connectivity between a specific source and its multiple sinks.\ud From a source perspective, the fate of sediment is controlled by its detachment and downstream transport\ud capacity, resulting in a specific trajectory of transfer and deposition. From a sink perspective, the assemblage\ud of incoming cascades defines provenance, sorting, and magnitude of sediment deliveries. At the network\ud scale, this information reveals emerging patterns of connectivity and the location of bottlenecks,\ud where disconnectivity occurs. In this paper, we apply CASCADE to quantitatively analyze the sediment connectivity\ud of a major river system in SE Asia. The approach provides a screening model that can support analyses\ud of large, poorly monitored river systems. We test the sensitivity of CASCADE to various parameters and\ud identify the distribution of energy between the multiple, simultaneously active sediment cascades as key\ud control behind network sediment connectivity. To conclude, CASCADE enables a quantitative, spatially\ud explicit analysis of network sediment connectivity with potential applications in both river science and\ud management

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Conceptual assessment of (dis)connectivity and its application to the Ganga River dispersal system

Cited by 71 publications

References 66 publications

Sediment connectivity: a framework for understanding sediment transfer at multiple scales

Sediment connectivity: a framework for understanding sediment transfer at multiple scales

Assessing sedimentological connectivity using WATEM/SEDEM model in a hilly and gully watershed of the Loess Plateau, China

Tracking multiple sediment cascades at the river network scale identifies controls and emerging patterns of sediment connectivity

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