Estuary 2D: rarely vs. permanently open

Illustration of open estuary base

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

Illustration of open estuary base with sand bar

Illustration of open estuary base with channels and sand dunes

Illustration of open estuary base with mud deposits

Illustration of 2-dimensional coastline base of a closed estuary with nearshore reefs

Illustration of a 3D estuary, with braided river and mudflat

Illustration of estuary base with coastal embayment