Resuspensio

Resuspension refers to the process by which particles, sediments, or contaminants that have settled onto a surface or within a medium are lifted back into suspension by external forces. This phenomenon is commonly observed in environmental, engineering, and biological contexts, such as in aquatic systems, atmospheric science, and soil mechanics.

In aquatic environments, resuspension typically occurs when high flows, waves, or biological activity disturb sediments at the bottom of water bodies, like lakes, rivers, or oceans. This movement can resuspend particles like silt, clay, organic matter, or pollutants, influencing water quality, nutrient cycling, and habitat conditions. Resuspension can lead to increased turbidity, impacting light penetration and affecting aquatic life.

In atmospheric science, resuspension describes the re-entrainment of dust, pollen, or other particles from surfaces into the air, often due to wind or human activities such as construction and agriculture. This process can influence air quality and human health by elevating airborne particulate matter.

In soil mechanics, resuspension refers to the lifting of settled particles into the air or water through disturbance, affecting erosion rates and pollutant dispersal. It plays a role in the transport of contaminants and nutrients within terrestrial ecosystems.

The mechanisms driving resuspension involve a combination of shear stresses, turbulence, or mechanical agitation that exceed the adhesion forces binding particles to surfaces. Managing resuspension is crucial in environmental protection, water treatment, and pollution control, as it can mobilize pollutants and alter natural processes.

Overall, resuspension is a dynamic process essential to understanding sediment transport, contaminant distribution, and ecosystem health across multiple scientific disciplines.