Gradient

Illustration of coastline base gradient from deep reef to shallow reef, exposed sand, protected sand, and estuary

Illustration of coastline base with sand dune system gradient from sea level to berm, frontal dune, and inner barrier system

Illustration of coastline base of stepped shoreline with variable water quality

Illustration of a 2D estuary with continental island and offshore reef

Illustration of closed and stratified lagoon base

Illustration of mountains with high gradient stream to sandstone lake

Illustration of salinity gradient

Illustration of stream base with aquiclude and spring

Illustration of stream base with springs and perched water table