The process by which solutes are transported by the bulk movement of flowing groundwater.
Dissolved and suspended solids are carried along with flowing groundwater. The path and rate of movement are governed by the geological setting and hydraulic gradient.
Why is advection important?
Advection is the main process by which solutes are transported in the subsurface especially in highly permeable material. As a result Darcy' Law can be used as a first estimate in predicting the movement of pollution plumes.