When it rains, traveling waves appear on steep asphalt pavement, slowly making their way down the slope. Because these so-called "roll waves" propagate without deforming and are typically characterized by abrupt discontinuities, they play an important role in hydraulic engineering. Understandin...

Source: [Phys.org](https://phys.org/news/2026-09-emerge-uniform-destabilizes-steep-slopes.html)

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