Components/Stores Flashcards
beaches found
mostly sand and shingle, backwash limited to transport material so with uneven surface there’s little erosion
sand
produces gentle slope, small particles so compact when wet allowing little percolation
shingle
make up whole/upper parts, larger size material so steeper gradient as water rapidly percolates
cusps
semi-circular shaped depressions that occur at junction of shingle and sand beaches
spits
an elongated, narrow ridge of land that has one end joined to mainland and projects across sea/estuary, composed of sand and shingle
coastal sand dunes
accumulations of sand shaped into mounds by the wind
what process mostly moves sand inland
saltation
tombolo
a spit that joins an island to the mainland
offshore bar
where a ridge of beach material that remains semi-submerged accumulates seaward of the breaker zone
estuarine landscapes
where the sea meets a river, mudflats and salt marshes are produced
diversity of characteristics coastal landscapes where land meets the sea includes
bays, estuaries, beaches, deltas, dunes, mudflats and saltmarshes
why are coastal landscapes dynamic
there are large and ever-changing amounts of energy available from wind-driven waves, tides and currents so constantly changing
factors during the Holocene that caused today’s coastal landscape
local tectonic processes, sea level change, climatic change, changing ocean currents/wave regimes, natural disasters, changing sources/types/amounts of sediment, changing nature of human activity
coastal outputs from the system
sediment above tidal limit (lost via wind or gravity)
sediment removed beyond local sediment cell- into neighbouring ones via transportation at time of high energy
dissipation of wave energy- lost energy
wave-cut platform
a gently sloping (<5’) relatively smooth, marine platform caused by abrasion at the base of a cliff