Earth Surface Dynamics
Earth Surface Dynamics
ESurf
Articles | Volume 13, issue 3
Articles | Volume 13, issue 3
https://doi.org/10.5194/esurf-13-349-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esurf-13-349-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 13, issue 3
Research article
 | 
14 May 2025
Research article |  | 14 May 2025

Influence of alluvial slope on avulsion in river deltas

Octria A. Prasojo, Trevor B. Hoey, Amanda Owen, and Richard D. Williams

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Cited articles

Aslan, A., Autin, W. J., and Blum, M. D.: Causes of river avulsion: Insights from the late Holocene avulsion history of the Mississippi River, U.S.A, J. Sediment. Res., 75, 650–664, https://doi.org/10.2110/jsr.2005.053, 2005. 
Bagnold, R. A.: An Approach to the Sediment Transport Problem From General Physics, USGS Professional Paper 422-I, https://doi.org/10.3133/pp422i, 1966. 
Bates, C. C.: Rational Theory of Delta Formation, AAPG Bulletin, 37, 2119–2162, https://doi.org/10.1306/5ceadd76-16bb-11d7-8645000102c1865d, 1953. 
Best, J.: Anthropogenic stresses on the world's big rivers, Nat. Geosci., 12, 7–21, https://doi.org/10.1038/s41561-018-0262-x, 2019. 
Brooke, S., Ganti, V., Chadwick, A. J., and Lamb, M. P.: Flood Variability Determines the Location of Lobe-Scale Avulsions on Deltas: Madagascar, Geophys. Res. Lett., 47, e2020GL088797, https://doi.org/10.1029/2020GL088797, 2020. 
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Decades of delta avulsion (i.e. channel abrupt jump) studies have not resolved what the main controls of delta avulsion are. Using a computer model, integrated with field observation, analytical, and laboratory-made deltas, we found that the sediment load, which itself is controlled by the steepness of the river upstream of a delta, controls the timing of avulsion. We can now better understand the main cause of abrupt channel changes in deltas, a finding that aids flood risk management in river deltas.
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