English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Alluvial plains are formed with sediments that rivers deposit on the adjacentflood-basin, mainly through crevasse splays and avulsions. These result froma combination of processes, some of which push the river towards the crevassethreshold, while others act as triggers. Based on the floodplainsedimentation patterns of large rivers in the southern Amazonian forelandbasin, it has been suggested that alluvial plain sediment accumulation isprimarily the result of river crevasse splays and sheet sands triggered byabove-normal precipitation events due to La Niña. However, more than90 % of the Amazonian river network is made of small rivers and it isunknown whether small river floodplain sedimentation is influenced by theENSO cycle as well. Using Landsat images from 1984 to 2014, here I analysethe behaviour of all 12 tributaries of the Río Mamoré with acatchment in the Andes. I show that these are very active rivers and that thefrequency of crevasses is not linked to ENSO activity. The data suggest thatmost of the sediments eroded from the Andes by the tributaries of theMamoré are deposited in the alluvial plains, before reaching the parentriver. The mid-to-late Holocene paleo-channels of these rivers are locatedtens of kilometres further away from the Andes than the modern crevasses. Iconclude that the frequency of crevasses is controlled by intrabasinalprocesses that act on a yearly to decadal timescale, while the average locationof the crevasses is controlled by climatic or neo-tectonic events that act ona millennial scale. Finally, I discuss the implications of river dynamics onrural livelihoods and biodiversity in the Llanos de Moxos, a seasonallyflooded savannah covering most of the southern Amazonian foreland basin andthe world's largest RAMSAR site

Alluvial plain dynamics in the southern Amazonian foreland basin