Dunes Lecture 11 Flashcards
1
Q
What are the essential ingredients for coastal dune formations?
A
Sediment input from offshore to build beach Availability of sediment on beach Wind to transport sediment Space onshore Time for building
2
Q
What areas are coastal dunes likely to develop?
A
Barrier islands Dissipative High wave energy, wide surf zone, bars, flat beach, large sed. Reflective Depends on width above berm Steepness reduces transport capacity
3
Q
What dominant dunes occur on dissipative, intermediate and reflective beaches?
A
Large trangressive
Parabolic and blowouts
Foredune scarping and small blowouts
4
Q
What sediment availability factors are ideal for coastal dune formation?
A
Beach exposure for prolonged period
Sand
Lack of surface roughness
