1. COASTAL DEPOSITIONAL FEATURES
GEOL 1033

2. DEPOSITIONAL COASTAL LANDFORMS are varied and often associated with each other:
beaches
sand bars
sand spits
tombolos
beach ridges
beach cusps
cuspate forelands
barrier islands
coastal sand dunes
washover fans
salt marshes
tidal flats
lagoons and bays
tidal deltas
river deltas

3. MAJOR OCEANIC MATERIAL INPUTS
Input source input amount
Rivers %
Glaciers %
Windblown dust %
Coastal erosion (higher than ave. locally) 1%
Volcanic debris <1%
Groundwater flow <2%

4. A well-defined, lobate sediment plume is seen emerging from a river source on this stretch of wave-dominated (beach-fronted) Atlantic coastline. Currents are starting to carry some of the sediment northward in the offshore environment. Note the broad, well-"fed" beaches in the direction of sediment transport and narrower, retreated beaches in the opposite direction. Typically, river input and cliff erosion are the major sources of sediment for a coastline (Space Shuttle, March 1994).

5. WAVE-DOMINATED NILE DELTA

6. Maps of some US barrier island coastlines

7. Plum Island, Mass.
Plum Island, northeastern Massachusetts, low altitude, oblique, aerial view of barrier island with beach-dune ridge showing washovers, vegetated backdunes, & back-barrier marsh with tidal channels (16 July 1975).

8. Sand Spits at the Down Drift ends of Barrier Islands

9. Beach ridges on a barrier island
McLaughlin's Beach (southwest end of Ninety Mile Beach), Victoria, Australia Recent Low altitude, oblique, aerial view of low-angle truncation of multiple beach-dune ridges (chenier ridges). This once prograding coastline was retreating, at least locally when this picture was taken (1976).

10. Development on a Barrier Island
Ocean City, Maryland, U.S.A.
Modern Beach island modification: Ocean City, a developed barrier island. Host to 8 million visitors a year, this city (and others similarly situated) has no effective protection against flooding and damage from severe storms.

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