Numerical modeling of tectonically driven river dynamics and deposition in an upland incised valley

Bianchi, Valeria, Salles, Tristan, Ghinassi, Massimiliano, Billi, Paolo, Dallanave, Edoardo and Duclaux, Guillaume (2015) Numerical modeling of tectonically driven river dynamics and deposition in an upland incised valley. Geomorphology, 241 353-370. doi:10.1016/j.geomorph.2015.04.007


Author Bianchi, Valeria
Salles, Tristan
Ghinassi, Massimiliano
Billi, Paolo
Dallanave, Edoardo
Duclaux, Guillaume
Title Numerical modeling of tectonically driven river dynamics and deposition in an upland incised valley
Journal name Geomorphology   Check publisher's open access policy
ISSN 0169-555X
1872-695X
Publication date 2015-07-15
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.geomorph.2015.04.007
Open Access Status DOI
Volume 241
Start page 353
End page 370
Total pages 18
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Abstract Within upstream reaches of incised valleys, fluvial sedimentation occurs where it is controlled by interaction between climate and tectonics. This study focuses on a Plio-Pleistocene fluvial paleovalley, which drained the northeastern margin of Siena basin (northern Apennines, Italy). Valley filling resulted from the interaction between river drainage and active normal faults striking perpendicular and parallel to the main valley. Through numerical modeling, this study aims to refine temporal and spatial mesoscale deposit variations, which highlight the upset of fluvial architectures derived from the interplay between the river system and uplift. Geomorphological and hydrodynamic parameter calibration was performed integrating field studies with paleohydraulic and paleomagnetic data. The numerical model simulates the evolution of valley formation with the development of (i) a pre-tectonic steady state system, followed by (ii) a syntectonic aggradation and avulsion phase, and (iii) a post-tectonic relaxation phase. The syntectonic phase shows fine sediment back-filling upstream of the uplifted area and coarse sediment down-filling downstream of the upwarping. The recorded aggradations are asynchronous with upstream deposition preceding downstream deposition.
Keyword Alluvial-valley fill
Numerical modeling
Syndepositional tectonics
Tuscany
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2016 Collection
 
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