The design will act as a point of connection with the building's historic neighbour, Greenwich Park. Maritime references will include a linear 160m water rill.
Blades of clipped hornbeam will add a green dimension to the new structure to reinforce the idea of the building at one with its setting. Designers may extend a celebrated herbaceous border.
"The building is derived from the landscape reinforcing the geometry of Andre Le Notre's 17th-century baroque plan, establish- ing a new east-west terrace," said landscape architect Chris Churchman.
"Landscape and the new Sammy Ofer wing are conceived as a series of overlapping layers which slide past each other enabling the ground plane to rise and fall. This draws people down to the new entrance plaza and upward toward an open viewing terrace, from which one can enjoy glimpses of the park and observatory beyond."
Architecture is conceived by CF Moller and developed by Purcell Miller Tritton. Construction is due to start this year and end in 2011 in time for the 2012 Olympics, during which the museum is set to host equestrian events.