Riprap

Riprap, also known as rip rap, rip-rap, shot rock, rock armor, or rubble, is human-placed rock or other material used to armor shorelines, streambeds, bridge abutments, pilings and other shoreline structures against scour and water, wave, or ice erosion. Common rock types used include granite and modular concrete blocks. Rubble from building and paving demolition is sometimes used.

Riprap protecting a concrete retaining wall

Riprap is also used underwater to cap immersed tubes sunken on the seabed to be joined into an undersea tunnel.

gollark: The figure is 1.361kW/m² solar irradiance, which is just measured from satellites.
gollark: Also nonequatorial regions.
gollark: 1.4kW/m² *maximum* ignoring things like the atmosphere, night, solar panel efficiency, solar panels not using all radiation ever, and weather.
gollark: It's very bizarre, given that according to random internet stuff I looked at polygraphs do not actually work as intended.
gollark: This is just a really bad license. You *cannot* safely use it.

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