Lulworth Cove concordant coastline model with Barry and Ben The Geography Men

Summary

In this video, Barry and Ben demonstrate how to model a coastal landscape using clay, sand, and water. They create a cross-section of a coastline featuring hard and soft rock layers, where a river valley erodes through the hard rock, eventually allowing the sea to erode the soft rock behind it. As the sea level rises, the process forms a cove, cave, and archway, mimicking natural erosion patterns seen in the Dorset coastline. The video showcases the step-by-step erosion process, ending with the formation of a distinctive coastal feature, such as Stair Hole or Durdle Door.

Takeaways

• 😀 You'll need a white tray, a pot of clay, a pot of sand, and water to create a model of a Concord coastline.
• 😀 Begin by creating sausage-like bands of clay, placing the first band along the longest side of the tray.
• 😀 The second layer of clay represents hard rock, while the sand in the middle represents soft rock.
• 😀 The model now has a band of hard rock, a layer of soft rock, and a second band of hard rock, which represents the rock types along a coastline.
• 😀 The area in the tray represents the sea, and the coastline runs parallel to the rock types.
• 😀 To aid erosion, create a river valley using your finger, which will erode through the rock types and flow toward the sea.
• 😀 Gently rock the tray back and forth to simulate waves, allowing the sea to erode the rocks.
• 😀 The sea penetrates the hard rock layer through the river valley and erodes the soft rock behind it.
• 😀 As the erosion continues, a cove begins to form behind the hard rock, taking on the typical scalloped shape.
• 😀 Over time, the sea creates a cave under the hard rock, which eventually turns into a small archway, showing further erosion processes.
• 😀 This process can eventually form significant coastal features, such as Low Earth Cove and Stair Hole, demonstrating coastal erosion.

Q & A

What materials are required to create the concord coastline model?

You will need a white tray, a pot of clay, a pot of sand, and water to create the concord coastline model.

How is the first layer of clay used in the model?

The first layer of clay is shaped into a sausage and then stuck to the longest side of the tray to represent the hard rock.

What is the purpose of the sand in the model?

The sand represents soft rock and is used to fill the gap between the two clay bands in the model.

Why is a river valley created in the model?

The river valley is created to simulate erosion, as the river erodes through the hard rock layer and carries water to the sea.

How does the sea contribute to the erosion process in the model?

The sea contributes to the erosion by rising and penetrating through the gap in the hard rock, washing away the soft rock behind it, and creating a cove.

What happens when the sea erodes the soft rock?

As the sea erodes the soft rock, it forms a cove behind the hard rock band, creating a characteristic scallop shape.

What is formed underneath the hard rock band as the erosion process continues?

A cave is formed under the hard rock band, which can eventually evolve into a small archway as the erosion process progresses.

How does the sea interact with the hard rock band during the erosion process?

The sea penetrates through the hard rock band and begins eroding the soft rock behind it, eventually creating features like caves or arches.

What real-world location is mentioned as an example in the model?

The model is based on the Dorset coastline, with references to landmarks like Lulworth Cove and Stair Hole.

What might happen if the erosion process continues over time in the model?

If the erosion process continues, more dramatic features like tunnels or sea arches might form, similar to the real-world feature known as 'Turtle Door'.