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sediments

Three woolly mammoths walk over a snowy steppe during the last Ice Age.
Posted inNews

Mammoths Lost Their Steppe Habitat to Climate Change

by Elise Cutts 19 November 202121 March 2022

Ancient plant and animal DNA buried in Arctic sediments preserve a 50,000-year history of Arctic ecosystems, suggesting that climate change contributed to mammoth extinction.

An uprooted tree after an extreme weather event
Posted inResearch Spotlights

New Theory Connects Tree Uprooting and Sediment Movement

by Aaron Sidder 19 November 202125 March 2022

Tree throw from extreme wind events plays an important role in the movement of sediment and erosion on forested hillslopes. A new theory offers a novel way to measure its impact.

Posted inEditors' Highlights

Himalayan Tectonics in the Driver’s Seat, Not Climate?

by P. Zeitler 15 September 20213 May 2022

Earth’s oscillating climate is a natural guess to explain cyclic patterns in erosion, but new sediment data suggests that cyclicity may emerge from tectonic processes adding material to the Himalaya.

Floodwaters fill the streets of Port Arthur, Texas, after Hurricane Harvey in 2017.
Posted inNews

When Rivers Are Contaminated, Floods Are Only the First Problem

by J. Besl 10 September 202124 March 2022

As floods increase in frequency and intensity, chemicals buried in river sediments become “ticking time bombs” waiting to activate.

Map showing location of study area (left) and conceptual model of tidally driven mixed sand–mud sediment transport at flood tide (right).
Posted inEditors' Highlights

Unravelling Sands and Muds Suspended in Coastal Environments

by Ryan P. Mulligan 26 July 202129 June 2022

A new study uses the response of optical and acoustic measurements to derive a sediment composition index for prediction of the relative fractions of mixed sediments in suspension.

A person’s gloved hand holds part of an ice core in which air bubbles can be seen, with the Antarctic landscape in the background. The ice in the core is up to 24,000 years old.
Posted inAGU News

Cutting to the Core

by Heather Goss 24 June 202114 April 2022

In our July issue, Eos looks at the collection, study, and storage of cores—from sediment drilled up from the age of the dinosaurs to tree rings as big as a house.

The restored floodplain of the South Fork McKenzie River in Oregon
Posted inEditors' Vox

Why Rivers Need Their Floodplains

by E. Wohl 22 April 202128 March 2022

Floodplain storage of water, nutrients, and sediment is critical to sustaining river ecosystems but has been reduced by human activities.

Watery mud accumulates between rows of crops.
Posted inNews

European Colonists Dramatically Increased North American Erosion Rates

by Rachel Fritts 11 January 202124 February 2022

Around 200 years ago, when conversion of land for agriculture became more widespread, the amount of sediment accumulating in riverbeds across the continent jumped tenfold.

Sediment swirls and mixes with water in a brown slurry
Posted inResearch Spotlights

Experimenting with Underwater Sediment Slides

by Terri Cook 8 October 202021 July 2022

Sediment-laden currents caused by breaching flow slides are hazardous to flood defenses and seabed infrastructure. New research shows that these phenomena must be accounted for in erosion simulations.

3 maps showing accumulation of sediment and organic material in coastal Louisiana
Posted inEditors' Highlights

Coastal Sediment Deficit Appears Smaller Than Previously Thought

by T. A. J. F. Hoitink 4 September 202024 February 2022

With a deficit of sediment needed to compensate for relative sea level rise, a new study demonstrates that organic material cannot be ignored in evaluating mass and volume accumulation rates.

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