Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Meandering rivers in modern desert basins: Implications for channel planform controls and prevegetation rivers

Full text
Santos, Mauricio G. M. [1] ; Hartley, Adrian J. [2] ; Mountney, Nigel P. [3] ; Peakall, Jeff [3] ; Owen, Amanda [4] ; Merino, Eder R. [5] ; Assine, Mario L. [6]
Total Authors: 7
[1] Univ Fed ABC, CECS, Av Estados 5001, BR-09210580 Santo Andre - Brazil
[2] Univ Aberdeen, Dept Geol & Petr Geol, Aberdeen AB24 3UE - Scotland
[3] Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire - England
[4] Univ Glasgow, Sch Geog & Earth Sci, Univ Ave, Glasgow, Lanark - Scotland
[5] Univ Sao Paulo, Inst Energy & Environm, Av Prof Luciano Gualberto 1289, Cidade Univ, BR-05508010 Sao Paulo - Brazil
[6] UNESP, Inst Geociencias & Ciencias Exatas, Ave 24A 1515, BR-13506900 Rio Claro - Brazil
Total Affiliations: 6
Document type: Journal article
Source: SEDIMENTARY GEOLOGY; v. 385, p. 1-14, MAY 1 2019.
Web of Science Citations: 3

The influence of biotic processes in controlling the development of meandering channels in fluvial systems is controversial. The majority of the depositional history of the Earth's continents was devoid of significant biogeomorphic interactions, particularly those between vegetation and sedimentation processes. The prevailing perspective has been that prevegetation meandering channels rarely developed and that rivers with braided planforms dominated. However, recently acquired data demonstrate that meandering channel planforms are more widely preserved in prevegetation fluvial successions than previously thought. Understanding the role of prevailing fluvial dynamics in non- and poorly vegetated environments must rely on actualistic models derived from presently active rivers developed in sedimentary basins subject to desert-climate settings, the sparsest vegetated regions experiencing active sedimentation on Earth. These systems have fluvial depositional settings that most closely resemble those present in prevegetation (and extra-terrestrial) environments. Here, we present an analysis based on satellite imagery which reveals that rivers with meandering channel planforms are common in modern sedimentary basins in desert settings. Morphometric analysis of meandering fluvial channel behaviour, where vegetation is absent or highly restricted, shows that modern sparsely and non-vegetated meandering rivers occur across a range of slope gradients and basin settings, and possess a broad range of channel and meander-belt dimensions. The importance of meandering rivers in modem desert settings suggests that their abundance is likely underestimated in the prevegetation rock record, and models for recognition of their deposits need to be improved. (C) 2019 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 14/13937-3 - Comparative analysis of modern fluvial systems and the rock record: outcrop-scale analogue modelling for the palaeoenvironmental interpretation of fluvial deposits
Grantee:Maurício Guerreiro Martinho dos Santos
Support type: Scholarships in Brazil - Post-Doctorate