18_coastal_processes

18_coastal_processes - Coastal Processes GS222 Lecture 18...

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Unformatted text preview: Coastal Processes GS222 Lecture 18 Overview - this lecture Littoral zone components Sources of beach materials Longshore drift vs. current Sand sorting and seasonal beach profiles Littoral Zone Area between seaward boundary of land vegetation and depth where sediment is no longer disturbed by waves (~10-20 m) 1) Backshore: low slope, dry, typically has berms where slope changes quickly. 2) Foreshore: area between highest high tide and lowest low tide 3) Nearshore: area between low tide line to zone where sediments are no longer disturbed by waves. Typically contains longshore bars. Littoral Zone Sources of beach material Whatever is nearby Usually quartz and feldspar grains, the most durable products of weathering of continental rocks (e.g. Outer Banks or CA) Alternatively can be volcanic (Hawaii) or carbonate-rich (Florida, Bahamas) Dominant source of sediments to the coasts is...
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18_coastal_processes - Coastal Processes GS222 Lecture 18...

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