Suspended sediment transport estimation in Negro River (Amazon Basin) using MSI/Sentinel-2 data
<p>The dynamics of suspended sediment production and transport in large rivers are essential geomorphological<br />processes that can influence biodiversity. The aim of this work was to analyze the spatio-temporal variation of suspended<br />sediment transport in the lower Negro Ri...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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União da Geomorfologia Brasileira
2022-01-01
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| Series: | Revista Brasileira de Geomorfologia |
| Subjects: | |
| Online Access: | http://www.lsie.unb.br/rbg/index.php/rbg/article/view/2076 |
| Summary: | <p>The dynamics of suspended sediment production and transport in large rivers are essential geomorphological<br />processes that can influence biodiversity. The aim of this work was to analyze the spatio-temporal variation of suspended<br />sediment transport in the lower Negro River using Sentinel-2 images. The suspended sediment concentration (SSC) was<br />estimated from the reflectance of band 4 of the MSI sensor onboard the Sentinel-2A and Sentinel-2B. The results indicate that<br />the hydrological regime controls the temporal variability of SSC, being higher in the low water period and lower during<br />flooding, with a mean concentration of 5.28 mg L-1 for the period 2015–2019. Analysis of the spatial variation of SSC in<br />Sentinel-2 images indicated a zone of active sediment deposition located downstream of the islands of the Anavilhanas<br />Archipelago. Geology, forest cover, and hydrological variability are the main factors controlling the low sediment yield of the<br />basin, with an estimated suspended solid flux of 5.76×106 ton∙year-1 and a specific yield of 8 ton∙km-2∙year-1. Despite the lower<br />quantity of images between February and April, due to high cloud cover, this study showed that Sentinel-2 images could be<br />used to monitor the temporal and spatial dynamics of suspended sediment transport in Amazonian blackwater rivers.</p> |
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| ISSN: | 1519-1540 2236-5664 |