Bernard, T;
Sinclair, HD;
Gailleton, B;
Fox, M;
(2021)
Formation of Longitudinal River Valleys and the Fixing of Drainage Divides in Response to Exhumation of Crystalline Basement.
Geophysical Research Letters
, 48
(8)
, Article e2020GL092210. 10.1029/2020gl092210.
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Abstract
Variations in rock strength act as a first‐order control on mountain landscapes. However, the transient topographic signal of basement exhumation has not been explored. We use model outputs to demonstrate the mobility of drainage divides in mountain ranges in response to the exhumation of basement rocks and the implications for the morphology of river catchments. The exhumation of harder rocks within a catchment reduces upstream channel steepness and erosion rates in contrast to neighbouring catchments. The results are a shift in the orogen‐scale drainage divide towards the harder rocks, and the formation of range parallel longitudinal valleys as neighbouring river networks capture the headwaters of catchments impacted by the harder lithology. Our model outputs provide a process explanation for the initiation of many longitudinal valleys in mountain ranges, and for the pinning of drainage divides on rocks of higher strength as seen the Central Pyrenees, Western Alps or High Atlas.
| Type: | Article |
|---|---|
| Title: | Formation of Longitudinal River Valleys and the Fixing of Drainage Divides in Response to Exhumation of Crystalline Basement |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1029/2020gl092210 |
| Publisher version: | http://dx.doi.org/10.1029/2020gl092210 |
| Language: | English |
| Additional information: | © 2021. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Geomorphology, numerical modelling, lithology, channel steepness, drainage divide, river network |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10126254 |
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