Sedimentation is the physical process by which particulate matter suspended in a fluid medium settles under the influence of gravity or centrifugal forces, leading to spatial segregation based on particle size, density, and shape. In research contexts it underpins techniques such as analytical and preparative centrifugation, sedimentation velocity and equilibrium methods, and sedimentation-based separation in environmental and geological studies. Sedimentation dynamics are described by Stokes’ law in the laminar regime, with deviations at higher Reynolds numbers. It critically influences transport and fate of contaminants, biogeochemical cycling of particulates, formation of stratified deposits, and clarification processes in engineered systems such as water and wastewater treatment.
The analysis of a sediment core from an oasis lake in Chad provides new insights into the history of precipitation in the Sahara. The study, led by the University of Cologne, shows that a prolonged wet phase, which lasted ...
Earth Sciences
Mar 26, 2026
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A new study using multidecade satellite imagery and face-to-face human interviews tracked the environmental and societal impacts of gravel mining in the Lubha River, Northeast Bangladesh. The researchers found that the river ...
Environment
Mar 12, 2026
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9
In some parts of the deep ocean, it can look like it's snowing. This "marine snow" is the dust and detritus that organisms slough off as they die and decompose. Marine snow can fall several kilometers to the deepest parts ...
Earth Sciences
Mar 9, 2026
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23
New findings from NASA's Perseverance rover have revealed evidence of wave-formed beaches and rocks altered by subsurface water in a Martian crater that once held a vast lake—considerably expanding the timeline for potential ...
Astrobiology
Jan 27, 2026
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237
Atmospheric dust plays an important role in the way Earth absorbs and reflects sunlight, impacting the global climate, cloud formation, and precipitation. Much of this dust comes from the continuous reshaping of Earth's surface ...
Earth Sciences
Dec 3, 2025
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44
A build-up of ultra-fine sediment in riverbeds is creating oxygen-starved conditions that threaten fish spawning grounds and freshwater invertebrates, new research on the River Taw in Devon has revealed. The study is published ...
Plants & Animals
Oct 21, 2025
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14
Over the past 8,000 years, Utah's Great Salt Lake has been sensitive to changes in climate and water inflow. Now, new sediment isotope data indicate that human activity over the past 200 years has pushed the lake into a biogeochemical ...
Environment
Aug 16, 2025
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149
The murky world at the bottom of the oceans is now a little clearer, thanks to a new study that tracks the evolution of marine sediment layers across hundreds of millions of years.
Earth Sciences
Aug 11, 2025
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73
When an earthquake causes a landslide, debris flow, or erosion, it can change the makeup of nearby lakes by introducing larger sediment particles, causing faster sediment buildup, and affecting carbon sequestration. The sediments ...
Earth Sciences
Jul 24, 2025
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29
Researchers from the Nanjing Institute of Geology and Paleontology of the Chinese Academy of Sciences and Columbia University, along with their collaborators, have analyzed sediments from the terrestrial Sangonghe Formation ...
Planetary Sciences
Jul 2, 2025
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