Environmental Engineering Reference
In-Depth Information
Fig. 2.10
At Portsea, on the north-facing coast of Port Phillip Bay, the predominant direction
of longshore drift is from west to east. Lobes of sand form on the shore of Triconderoga Bay, to
the w, and drift intermittently round police point into Weeroona Bay. As each sand lobe arrives,
the beach widens in Weeroona Bay, but when it moves on the beach is depleated. Successive epi-
sodes of beach erosion have resulted in the building of sea walls along the shore. In 2010 there was
severe beach erosion at Portsea Pier, with sand drifting away round point Franklin and along the
coast to Shelly Beach and Point Macarthur, where there has been beach accretion. A sandbag ram-
part has been built on the eroded sector (Fig.
2.11
), but the beach has not yet revived. © Geostudies
Fig. 2.11
A sandbag rampart marks the site of beach erosion at Portsea, Port Phillip Bay,
Australia, in 2013. © Geostudies
