Here, the steep, sunlit side of the dune, called a slip face
, indicates the down-wind side of the dune and direction of its migration.
Mr Connors says that erosion is occurring to the slip face
itself, below the road, and a larger geological process is generating more deep-seated movement adjacent and north of the slip.
Police say Funk was speeding and lost control on a slip face
dune and then left his passenger behind.
The work will involve securing the existing slip face
, followed by the building of a large concrete retaining wall, behind which the road will be rebuilt.
The steep dip angles indicate that this surface was a former slip face and gives the first evidence of the development of dunes with significant topographical relief.
In the southern segment of the study section (Figure 3C) the Inceptisol is exposed at between 10 to 15 meters above current lake level and dips 22[degrees] to 25[degrees] to the east, This suggests that these outcrops represent a portion of the back (landward) slip face of the former dune.
Contractors will be undertaking revegetation work to help stabilise a slip face
in the gorge over the next week.