Global dominance of tectonics over climate in shaping river longitudinal profiles

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1038/s41561-021-00720-5. This is version 2 of this Preprint.

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Authors

Hansjörg Seybold, Wouter Berghuijs , Jeff P. Prancevic, James W Kirchner

Abstract

River networks are striking features engraved into Earths surface, shaped by uplift and erosion under the joint influence of climate and tectonics. How a river descends along its course – its longitudinal profile – varies greatly from one basin to the next, reflecting the interplay between uplift and erosional processes. It has recently been argued that climatic aridity should be a first-order control on river profile concavity, but the importance of climate relative to other factors has not been tested at global scale. Here we show, using recent global datasets of river profiles and tectonic activity, that tectonics is much more strongly expressed than climate in global patterns in river profile concavity. River profiles tend to be more strongly concave in tectonically active regions along plate boundaries, reflecting tectonically induced spatial variations in uplift rates. Rank correlations between river profile concavity and global tectonic proxies (basin slope and two indices of seismic risk) are much stronger than those between river concavity and precipitation, potential evapotranspiration, or aridity. These results show that tectonics, and not climate, exerts first-order control on the shape of river longitudinal profiles globally.

DOI

https://doi.org/10.31223/osf.io/bj8kh

Subjects

Earth Sciences, Geology, Geomorphology, Hydrology, Physical Sciences and Mathematics, Tectonics and Structure

Keywords

climate, Tectonics, Aridity, Concavity, river longitudinal profile

Dates

Published: 2020-03-18 16:46

Last Updated: 2021-08-05 11:51

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License

CC BY Attribution 4.0 International