Complexity in a cellular model of river avulsion

Jerolmack, D. J.; Paola, Chris

doi:10.1016/j.geomorph.2007.04.022

Cited by 156 publications

(167 citation statements)

References 25 publications

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“…Moreover, the present framework does not account for the redistribution of sediment load within the delta branches that strongly influences channel siltation and avulsion (3,6). The simplified model presented herein focuses only on tidal dynamics and is therefore complementary to already existing models of delta formation (14,15).…”

Section: Discussionmentioning

confidence: 99%

“…distributary ͉ tide ͉ tidal prism ͉ avulsion ͉ discharge O f the 3 main classes of deltas (river dominated, wave dominated, and tidal dominated), the morphology of tidaldominated deltas presents the most dendritic structure (1)(2)(3)(4). I hypothesize in this article that tidal delta evolution is driven by channel avulsion (defined herein as the abrupt change in the course of a channel caused by floods, storm surges, or variations in tidal regime) that creates new distributaries, and by the silting of old branches when the discharge is not large enough to transport its entire sediment load.…”

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confidence: 99%

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Self-organization of tidal deltas

Fagherazzi

2008

Proc. Natl. Acad. Sci. U.S.A.

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Tidal deltas are characterized by a dendritic network of distributaries that transport water and sediments to the ocean. Here, I show that the distributaries self-organize to uniformly redistribute the tidal prism across the entire delta system. The 2 opposite mechanisms of channel formation by avulsion and channel abandonment drive the entire delta toward a critical state at which every channel is close to the silting threshold. Under these conditions the delta reaches self-organized criticality, with changes of its planimetric channel distribution occurring across several spatial scales.distributary ͉ tide ͉ tidal prism ͉ avulsion ͉ discharge

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Self-organization of tidal deltas

Fagherazzi

2008

Proc. Natl. Acad. Sci. U.S.A.

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“…In avulsions by annexation, preexisting channels on 611 the floodplain surface capture the flow of the main channel belt. Avulsions commonly reoccupy 612 abandoned channels on the floodplain surface because these tend to be relatively low elevation 613 locations (Jerolmack and Paola, 2007). An example of such an avulsion almost occurred on the Kosi 614…”

Section: Okavango Rift Basin 423mentioning

confidence: 99%

Fluvial geomorphic elements in modern sedimentary basins and their potential preservation in the rock record: A review

et al. 2015

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“…It was observed by other studies that avulsion occurs when i.e. a pre-existing abandoned channel can be reached easily (asLan and BLum 1999;sLinGerLand and smith 2004) or if the channels are elevated enough to collide (zarn and daVies 1994;mohriG et al 2000;FieLd 2001;CazanaCLi et al 2002;jeroLmaCk and PaoLa 2007). In this case, the Nyírség alluvial fan was overly elevated only in Scenario #1, and therefore the channel of the Szamos River was not able to reach the Tisza River and potentiate the avulsion process, while the former alternating channels had been already accumulated ( Fig.…”

Section: Discussionmentioning

confidence: 98%

Confirmation of a theory: reconstruction of an alluvial plain development in a flume experiment

Bertalan¹,

Tóth²,

Szabó³

et al. 2016

Erdkunde

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Summary:Fluvial geomorphologists have tried to describe the outstanding tectonically affected avulsion process of Tisza River at the Great Hungarian Plain by various theoretical concepts. Flume experiments provide the ability to examine the main characteristic processes of a highlighted surface development theory under controlled settings within an accelerated time scale. Our goal was to reconstruct and refine these hypotheses from a new experimental point of view. Contrary to the previous flume studies focused on a highlighted mechanism, our experiment combined several processes for confirmation purposes. In this study we performed an experiment of the avulsion process mentioned above on a 12 x 5 x 2.5 m flume where a special instrument was planted under the sand layers in order to simulate the vertical tectonic movements. A terrestrial laser scanner was used to record the different stages of the topographic evolution. We shaped the initial surface and executed the main landscape forming processes according to theoretical descriptions then with modifications to examine the similarities and differences between the experimental outcomes and the theoretical evolution. The results of three different types of scenarios proved the key role of the uplifting Nyírség alluvial fan in the channel direction changing process of Tisza River. On the other hand, the role of Bodrogköz area had been questioned. Flume experiments with appropriate equipment can serve as a suitable tool for the reconstruction of surface development theories taking into account several landscape forming processes simultaneously.Zusammenfassung: Die außergewöhnliche, tektonisch bedingte Flussverlagerung der Theiß in der Großen Ungarischen Tiefebene beschäftigt die Fluvialmorphologie seit Langem und hat zu unterschiedlichen theoretischen Erklärungsansätzen geführt. Experimente in Versuchskanälen bieten die Möglichkeit, grundlegende Prozesse der Fluss-und Oberflächenge-nese einzelner theoretischer Ansätze unter kontrollierten und zeitlich beschleunigten Bedingungen zu untersuchen. Das Ziel der vorliegenden Studie bestand darin, die Hypothesen der Theiß Flussverlagerung von einer experimentellen Seite aus zu beleuchten. Angesicht der Komplexität der vorliegenden theoretischen Konzepte, bestand im Unterschied zu zahlreichen anderen Versuchskanalexperimenten, die Herausforderung dieser Studie in der Simulation eines multifaktoriellen Prozessgefüges. Die Experimente wurden in einem 12 x 5 x 2,5 m Versuchskanal durchgeführt, der durch einem Umbau so modifiziert wurde, dass unterschiedliche Zonen angehoben und abgesenkt werden können, um tektonische Bewegungen zu simulieren. Unterschiedliche Stadien der Oberflächengenese wurden mit einem terrestrischen Laserscanner erfasst. Ausgehend von einer initialen Oberfläche und wurden die Experimente entsprechend der theoretischen Konzepte durchlaufen und für Vergleichszwecke ergänzt durch Versuchsläufe mit leicht modifizierten Rahmenbedingungen. Im Ergebnis belegen die durchgeführten Experimente übereinstimmend die b...

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Complexity in a cellular model of river avulsion

Cited by 156 publications

References 25 publications

Self-organization of tidal deltas

Self-organization of tidal deltas

Fluvial geomorphic elements in modern sedimentary basins and their potential preservation in the rock record: A review

Confirmation of a theory: reconstruction of an alluvial plain development in a flume experiment

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