Hugo Ulloa
@hnulloa.bsky.social
Reposted by Hugo Ulloa
Physicists explore the formation and behavior of “sandballs”—the peanuts, doughnuts, and orbs of sand and water that form when raindrops hit a sandy slope. Sandballs have implications for bioengineering, pharmaceuticals, and snow physics. In PNAS: https://ow.ly/aitg50XOW8U
December 28, 2025 at 12:00 AM
Physicists explore the formation and behavior of “sandballs”—the peanuts, doughnuts, and orbs of sand and water that form when raindrops hit a sandy slope. Sandballs have implications for bioengineering, pharmaceuticals, and snow physics. In PNAS: https://ow.ly/aitg50XOW8U
Reposted by Hugo Ulloa
Raindrops can bounce and then roll down a slope, picking up sand as they go.
The sand-covered balls transport up to 100 times more sediment downhill than drops that don’t roll, a fact that could help make more realistic computer models of soil erosion and land change. https://scim.ag/4p7ghBE
The sand-covered balls transport up to 100 times more sediment downhill than drops that don’t roll, a fact that could help make more realistic computer models of soil erosion and land change. https://scim.ag/4p7ghBE
December 27, 2025 at 12:05 AM
Raindrops can bounce and then roll down a slope, picking up sand as they go.
The sand-covered balls transport up to 100 times more sediment downhill than drops that don’t roll, a fact that could help make more realistic computer models of soil erosion and land change. https://scim.ag/4p7ghBE
The sand-covered balls transport up to 100 times more sediment downhill than drops that don’t roll, a fact that could help make more realistic computer models of soil erosion and land change. https://scim.ag/4p7ghBE
Reposted by Hugo Ulloa
In a study led by my colleague Hugo Ulloa, we reveal a surprising new mechanism for erosion by raindrops. Sandballs form when rolling drops mop up sand, even reaching a jammed state! #SoftEarthGeophysics
Raindrops can bounce and then roll down a slope, picking up sand as they go.
The sand-covered balls transport up to 100 times more sediment downhill than drops that don’t roll, a fact that could help make more realistic computer models of soil erosion and land change. https://scim.ag/4p7ghBE
The sand-covered balls transport up to 100 times more sediment downhill than drops that don’t roll, a fact that could help make more realistic computer models of soil erosion and land change. https://scim.ag/4p7ghBE
December 27, 2025 at 12:17 AM
In a study led by my colleague Hugo Ulloa, we reveal a surprising new mechanism for erosion by raindrops. Sandballs form when rolling drops mop up sand, even reaching a jammed state! #SoftEarthGeophysics
Energetics of particle-size segregation | Journal of Fluid Mechanics | Cambridge Core - bit.ly/416cGM4 . This paper reconnects us to our roots. Tomas Trewhela and I wrote it on the playground while Olivia and Helia began their incredible journey of life. Enjoy it!
Energetics of particle-size segregation | Journal of Fluid Mechanics | Cambridge Core
Energetics of particle-size segregation - Volume 1000
bit.ly
November 27, 2024 at 7:18 PM
Energetics of particle-size segregation | Journal of Fluid Mechanics | Cambridge Core - bit.ly/416cGM4 . This paper reconnects us to our roots. Tomas Trewhela and I wrote it on the playground while Olivia and Helia began their incredible journey of life. Enjoy it!