Dunes in the world’s big rivers are characterized by low-angle lee-side slopes and a complex shape
| Autor: | Renato Paes de Almeida, Richard J. Huizinga, Mario L. Amsler, Justin A. Boldt, Hongbo Ma, Jeffrey A. Nittrouer, Daniel R. Parsons, James L. Best, Yuanfeng Zhang, Cristiano Padalino Galeazzi, Ping Wang, Bernardo Tavares Freitas, Kevin A. Oberg, Oscar Orfeo, Julia Cisneros, Marco Ianniruberto, Theodore Adriënne Godefrieke Petula van Dijk, Ricardo Nicolas Szupiany |
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| Rok vydání: | 2020 |
| Předmět: |
Bedform
010504 meteorology & atmospheric sciences Flood myth Stratification (water) 010502 geochemistry & geophysics 01 natural sciences Angle of repose Sedimentary depositional environment General Earth and Planetary Sciences Bathymetry Alluvium RIOS Geomorphology Geology 0105 earth and related environmental sciences Bed load |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1752-0908 1752-0894 |
| DOI: | 10.1038/s41561-019-0511-7 |
| Popis: | Dunes form critical agents of bedload transport in all of the world’s big rivers, and constitute appreciable sources of bed roughness and flow resistance. Dunes also generate stratification that is the most common depositional feature of ancient riverine sediments. However, current models of dune dynamics and stratification are conditioned by bedform geometries observed in small rivers and laboratory experiments. For these dunes, the downstream lee-side is often assumed to be simple in shape and sloping at the angle of repose. Here we show, using a unique compilation of high-resolution bathymetry from a range of large rivers, that dunes are instead characterized predominantly by low-angle lee-side slopes ( |
| Databáze: | OpenAIRE |
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