# Gravity current

From AMS Glossary

## gravity current

A flow driven by horizontal pressure gradients, due typically to the flow of a fluid of one density intruding into an ambient fluid of different density.

In nonrotating fluid, the head of the current travels with uniform horizontal speed in which

*g*′ is the reduced gravity,*H*is the current depth, and*C*is a constant of order unity. Sea breezes, landslides, and some instances of cold water formation are common manifestations of gravity currents in geophysical circumstances.