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The characteristics of the rocks in rivers are one of the biggest controls on how rivers work!

In this video, we team up with geomorphologist Dr Shasta Marrero and fieldwork specialist Sam Hawkins, to explore how we can investigate this in the field by collecting data on the size and shape of river sediment.


Written and developed by: Dan Hobley, Shasta Marrero, Nick Lapthorn, Janine Maddison, Sam Hawkins, Rob Parker, Harriet Ridley, Tim Parker.

Videography by: Aaron Ealing-Vose, Harriet Ridley, Emily Bilbie, Rob Parker.


Ganges Delta contains modified Copernicus Sentinel data (2020), processed by the ESA and licensed under CC BY-SA 3.0 IGO.

thick-stamp.wav by newagesoup is licensed under CC BY 3.0.

Powers Index card from based on that of Powers, M.C., 1953, A new roundness scale for sedimentary particles: Journal of Sedimentary Petrology, 23:117-119.

Ganges Delta by NASA is in the public domain.

Underwater sound by monica137142 is licensed under CC BY 3.0

Mountain River sound by tosha73 is licensed under CC BY 3.0