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SUB AREAL PROCESSES AND WEATHERING, CONCORDANT COASTLINES Concordant…
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CONCORDANT COASTLINES Concordant coastlines are where the rock strata run parallel to the coast. The rock type varies between different concordant coasts and normally consist of bands of more resistant and less resistant rock. For example, limestone may run in parallel bands with clays and sands. These different rock types create different landforms due to erosion
Concordant coastlines can lead to the formation of Dalmatian coastlines, where a rise in sea levels led to the flooded widen river valleys between tall headlands. The headlands become islands, running perpendicular to the mainland.
Haff coasts are also dependant on a concordant coastline, where large bays are crossed by spits, creating a extensive lagoons.
DISCORDANT COASTLINES
This is where the rock strata run perpendicular to the sea, which can create successions of headlands and bays; less resistant rocks are eroded faster than the more resistant rocks, which leads to the formation of bays.
Headlands and bays have an effect on income waves and cause wave refraction. Wave refraction is the process by which waves turn and lose energy around a headland on uneven coastlines. The wave energy is focussed on the headlands, creating erosive features in these areas. The energy is dissipated in bays leading to the formation of features associated with lower energy environments such as beaches.