When does faulting-induced subsidence drive distributary network reorganization?

This is a Preprint and has not been peer reviewed. This is version 1 of this Preprint.

Downloads

Download Preprint

Authors

Andrew J. Moodie , Paola Passalacqua 

Abstract

Deltas exhibit spatially and temporally variable subsidence, including vertical displacement due to movement along fault planes. Faulting-induced subsidence perturbs delta-surface gradients, potentially causing distributary networks to shift sediment dispersal within the landscape. Sediment dispersal restricted to part of the landscape could hinder billion-dollar investments aiming to restore delta land, making faulting-induced subsidence a significant, yet unconstrained hazard to these projects. In this study, we modeled a range of displacement events in disparate deltaic environments, and observe that a channelized connection with the displaced area determines whether a distributary network reorganizes. When this connection exists, the magnitude of distributary network reorganization is predicted by a ratio relating dimensions of faulting-induced subsidence and channel geometry. We use this ratio to extend results to real-world deltas and assess hazards to deltaic-land building projects.

DOI

https://doi.org/10.31223/X5G616

Subjects

Earth Sciences, Geomorphology

Keywords

subsidence, land building, sediment diversions, distributary networks

Dates

Published: 2021-07-18 22:01

Last Updated: 2021-07-19 05:01

License

CC BY Attribution 4.0 International

Add a Comment

You must log in to post a comment.


Comments

There are no comments or no comments have been made public for this article.