Beach Longshore Geometry

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Beach Longshore Geometry

• Shoreline Beach Morphology
• Shoreline Beaches
• Detached Beaches (Barriers)

CUSPS
Cusps, Crescentic Bars, Cell
Circulation Topography
RHYTHMIC
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Cusp Spacing Equidistant?

• EDGE WAVES (Seymour Aubrey, 1985)

EDGE WAVES

• ORIGIN Formed during sea level stillstands.
• INITIAL SPACING Subharmonic edge waves (TEW ?
  TIW), spacing persists until a radical change in
  wave conditions occurs.
• CUSP FIELD DESTRUCTION Storm waves plane-off
  beach or arrhythmic cusps are left.

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Cell Circulation Topography
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Shoreline Beach
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Crescentic Bars

• Order of magnitude higher than cusps (100-2000m)
• Submerged bar formation

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Swash Alignment/Drift Align(Davies, 1980)

• ANTECEDENT CONTROL

ZETA FORM BEACHES
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Major Morphologic Features of a Typical Inlet
Tidal Delta
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Variation in Morphology of Depositional
Shorelines with Respect to Variations in Tidal
Range