In sedimentary geology and fluvial geomorphology, avulsion is the rapid abandonment of a river channel and the formation of a new river channel. Avulsions occur as a result of channel slopes that are much less steep than the slope that the river could travel if it took a new course.

2024年9月18日 · Avulsing rivers create new pathways on the floodplain and the associated flooding can profoundly affect society 1, 2, 3, 4. River avulsions are thought to occur when the water column becomes...

2020年4月30日 · We show that for 63 avulsions from Andean, Himalayan, and New Guinean basins, avulsion style correlates with channel morphology and changes systematically downstream. Avulsions in braided rivers...

2024年10月10日 · One held that avulsions happen when a river becomes superelevated, or the deposition of sediment raises a river’s water level above the surrounding land.

2024年11月21日 · Avulsions are difficult to predict—the exact factors that cause a river to quickly shift course are not well understood. A recent study published in Nature identifies physical rules that indicate...

Here we investigate the rules for river avulsion by measuring the topography of recently avulsed rivers and the factors that influence avulsion pathways.

2004年4月21日 · River avulsion is a relatively abrupt and major diversion of water flow from an established channel to a new or preexisting channel in the floodplain, eventually leading to the formation of...

2016年1月1日 · An avulsion is when a river channel switches location, often abruptly, along part of its course. Avulsions are characteristic of fluvial and deltaic environments, including alluvial fans and rivers with multiple channels.

1999年10月7日 · Avulsion, i.e. the relatively sudden displacement of a river channel, has an important effect on sediment distribution and on architecture of fluvial deposits because avulsion is a primary control on channel location on a floodplain. Most avulsions occur when a triggering event, commonly a flood, forces a river across a stability threshold.

By forcing large-scale repositioning of stream channels, avulsion is a dominant mechanism for constructing river floodplains, deltas, and alluvial fans and for generating laterally extensive sedimentary deposits in the stratigraphic record.