Coastline development

Question 1

Discordant coastline development - Headland

Answer 1

When waves approach a headland, the depth if the water decreases, causing the waves to become higher and steeper. Their velocity also reduces and they become closer together. All of these factors increase their erosive power.

Question 2

Discordant coastline development - Bay

Answer 2

When waves enter a bay, the water is deeper. Therefore, they don’t lose their velocity as rapidly and they are also lower and less steep than those off the headland. This allows deposition rather than erosion to take place.

Question 3

What is a discordant coastline?

Answer 3

Bands of rock and layer run perpendicular to the coastline. (vertically).
Usually, the geology alternates between strata and hard rock and soft rock.
Headlands and bays occur on these coastlines.
Higher rate of erosion that deposition.

Question 4

What is a concordant coastline?

Answer 4

This is where beds, layers and rocks are folded into ridges that run parallel to the coast (Horizontal)
Usually concordant coastlines have the same type of rock along its length.

Question 5

What is a Dalmation coastlines?

Answer 5

A type of concordant coastline.
Strata runs in horizontal lines.
Formed due to sea level rise. When the valley flooded, the tops of the ridges remained above sea level.
Offshore islands that run parallel to the coast.
Eg Dalmation coast, Croatia.
Contour lines run parallel to the coast.
Bays form here (as well as caves)