Include relevant key terms.

Slides:



Advertisements
Similar presentations
The Dorset Coast The Dorset Coast is part of an area of coastline known as the Jurassic Coast and is one of the most attractive and best known stretches.
Advertisements

The Dorset Coast (and a little bit of Hampshire!) ~ a virtual field trip ~ I took this picture!
COASTAL ENVIRONMENTS 2 erosion landforms depositional landforms.
Higher Coasts Lithosphere
Teach me, Tell Me How are coasts shaped by physical processes? You have been given a key word with a definition on it. 1.You must quiz one person to define.
GCSE COASTS.
Coastal Change and Conflict
GCSE COASTS. COASTAL EROSION Erosion Processes 1.Corrasion / Abrasion 2.Scouring 3.Hydraulic Action 4.Solution 5.Attrition.
COASTAL LANDFORMS.
What features are distinctive? We surveyed 28 local people and asked them which of the landforms we were visiting were the most distinctive. We asked locals.
Geology and Rock Type The most important feature of a coast is often the type of rock in the area. Some rocks are resistant to erosion, whereas other rocks.
How are different coastlines produced by physical processes?
Higher Geography Physical Environments: Lithosphere
Coastal Erosion Features. Coastal Erosion Processes Coastal erosion processes create a number of significant landforms. There are a number of factors.
LITHOSPHERE CORE COASTLINES 1 MARINE EROSION PROCESSES. Read the course booklet. You will need to know and be able to explain the four methods of coastal.
TOPIC COASTLINES. Local Geology The coastline of the British Isles is not smooth. Why ? The nature of the rocks is important. Some are very hard but some.
What do these photos show? What are the similarities and differences between them? What produced these differences? Different Coastlines Waves Geology.
Conflict at the coast Examine how development and use of the coast leads to conflict and competition for space Explain why the geology of the Dorset coast.
Coastal Map Reading Higher Geography.
Erosion and Deposition
Last minute GCSE geography KGGS
Coastal Features Headlands and Bays A headland is an area of land which juts out to sea and is surrounded by sea on three sides. Headlands form in coastlines.
Coastal Landforms. - Cliffs and wave cut platforms - Beaches - Caves, arches, stacks and stumps - Headlands and bays - Spits - Summary.
Sitges, Barcelona.
LITHOSPHERE CORE COASTLINES 1 The force of waves hitting a cliff (or sea wall) compresses water and air into cracks and joints. This increase in pressure.
TOPIC COASTLINES Jq03NBao.
COASTAL EROSIONAL AND DEPOSIONAL FEATURES
Title: Coastal Landscapes
Chapter 2: Coastal Landscapes and Processes NEXT EDEXCEL GCSE GEOGRAPHY A TEACHING AND LEARNING RESOURCES Chapter 2 Coastal Landscapes and Processes Image.
Swanage Bay case study: Causes of coastal recession Odd one out and why: 1.spit, beach, bar 2.Attrition, abrasion, biological 3.Fetch, longshore drift,
Coastal landforms LS: Explain the formation of erosional coastal landforms using vast key words. Describe the process of longshore drift and describe the.
MLO 5:Coastal Processes. Wave Erosion Hydraulic pressure = The pounding force of water/waves. Corrosion = Minerals such as calcium carbonate & limestone.
EQ1: To What Extent do Rates of Coastal Recession Depend on
Erosion and Deposition
Headlands and Bays Coastal Features
Wave action and coastal landforms
Coastal landforms - revision
Case Study of the Dorset Coast
Coastal Depositional Landforms
Hydraulic Action The force of waves hitting a cliff (or sea wall) compresses water and air into cracks and joints. This increase in pressure may lead to.
Physical Geography Must be familiar with The sea Rivers Glaciation
PAPER 1: Living with the physical environment
Theme 2. The natural environment 2. 1 Plate tectonics 2
Coastal Landforms.
Coastal landforms - revision
Coastal defence (management) against flooding and erosion.
Sub-aerial processes (v submarine processes)
Go through and highlight important information.
Shoreline Features.
BAYS AND HEADLANDS Features of Coastal Erosion: Headlands and Bays Waves attack the coastline. Harder rock Softer rock Harder rock.
Coastal Landforms.
Wave Cut Platform Formation Fig 18.4 p301 Add in the Retreating cliff
What type of waves will erode the coastline?
River Erosion Erosion shapes the land in different ways as the river moves from its source to its mouth: Near the source of a river, in the upper course,
Transportation and deposition
L.O: To know and explain how features of deposition are formed.
Coastal Erosion and Deposition by Amy Smith.
Lithosphere / Rural Land / Exam Technique
Unit 2 Lesson 2 Erosion and Deposition by Water
The Dorset Coast (and a little bit of Hampshire!)
Coastal Landforms: Erosional and Depositional
Headlands and Bays Coastal Features
What is this? Can you guess how it has been formed?
Peer Verbal Feedback.
Two topics Rocks Geological variation in the UK:
Presentation transcript:

Include relevant key terms. main land uses and the geology of the Purbeck coast and Isle of Purbeck (you will explain how the geology has influenced the development of these coastal features. Read through all the information cards, examine the geology, Ordnance Survey With reference to a variety of coastal features annotate your sketch map with detailed diagrams (use the satellite and information card photos) to show and 2. On A3 paper, draw and annotate sketch maps at different scales to show the AS Explain the relationship between geology and coastal form along one named Maps and satellite images. need to develop a key). stretch of coast (6 marks) Exam Practice: Task: Hint – Refer to specific named locations, geology rock types, explanations should include reference to the 5 factors that affect coastal morphology from lesson 2.i Include relevant key terms.

Sand and clay relatively unconsolidated Mainly limestone, strong and hard but with regular joints Mainly clay, relatively unconsolidated Sand and clay relatively unconsolidated Relatively unconsolidated Mechanically strong

A A

Discordant Coasts The geology of the cliff is a really important factor that influences the rates of erosion. The resistance of rock essentially determines differential rates of erosion. As we can see in Swanage, along the (very beautiful) Dorset coast. Two headlands, Ballard Point (chalk) and Durlston Head (limestone) of harder rock types are more resistant to erosion. As a result they jut out to sea, forming headlands. The softer clays of Swanage have eroded much faster to form the bay. Coastlines, where the geology alternates between strata (or bands) of hard rock and soft rock are called discordant coastlines. Concordant Coasts Dominated by limestone it has the same type of rock along its length. Concordant coastlines tend to have fewer bays and headlands. A close up of Lulworth Cove in the map below shows that bays and coves can form at concordant coasts, once gaps in the resistant rock becomes breached. In this case, the Portland limestone has been breached at several points. Once broken through, the clay can be easily eroded to form a cove. Dalmatian Coasts This is an example of a concordant coastline. They have formed as a result of a rise in sea level. Valleys and ridges run parallel to each other. When the valley flooded because of the rise in sea level, the tops of the ridges remained above the surface of the sea as a series of offshore islands that run parallel to the coast. The best example of a Dalmatian coastline is Croatia (there is also a good example on the Pacific coast in Southern Chile.

The cliffs at Kimmeridge Bay contain a very thick sequence of Kimmeridge Clay (exposed, at low tides) and layers of mudstones, thin shales and resistant yellow-brown dolomites, (the stone bands). Each rock layer provides a look back through geological time. Providing an excellent record of the Jurassic period. erosion of the less-resistant clays behind the limestone led to the formation of the cove or bay. Over time the sea gradually eroded the resistant Purbeck limestone at the entrance to Lulworth Cove. Then rapid which are relatively unconsolidated. Cliff recession takes place at a At Kimmeridge Bay, the cliffs consist of less resistant clays faster rate .

At Stair Hole, the sea has eroded through the limestone and clays to create a small cove. It shows the Lulworth Crumple, an excellent example of limestone folding. The limestone and shale strata were folded due to tectonic movements 30mn yrs ago when the African plate collided with the European Plate arch . Formed by the erosive power of Durdle Door is an impressive natural the sea on the vertical layers of different types of rock. At some point in the past the sea would have begun to breach the hard Portland Limestone. And then more easily erode the softer Wealden beds Behind it. Warbarrow Bay was formed in a similar way to Lulworth Cove. The less resistant wealden clay has been eroded by the sea to expose the layers of chalk behind,. This chalk now forms the cliffs of the bay.

Haff Coasts Theses coasts consist of concordant features – long spits of sand and lagoons – aligned parallel to the coast. They are named after lagoon, or Haffs, of the southern shore of the Baltic Sea, which are enclosed by sand spits or dunes. Swanage Bay consists mainly of unconsolidated Wealden clay which is less resistant to erosion. These soft cliffs are subject to weathering processes as well as marine erosion. Nearer to the town of Swanage groynes have been installed to slow the process of Long shore drift and build a beach. This is good for tourism as well as protecting the cliffs from erosion. The Foreland is a sedimentary chalk headland, South of Studland. Weathering and erosion of the headland over thousands of years has formed features such as Old Harry (Stack), Old Harry’s wife (stump) as well as cave and arch features.

Headlands and bays affect incoming waves in different ways: Headlands force the incoming waves to refract or bend, concentrating their energy at eh headland. This increases the waves’ erosive power, steepening the cliffs and forming caved and arches. Bays when waves enter a bay their energy is dissipated (spread out) and reduced. This leads to deposition of sediment and forms a sand or shingle beach. Durlston Head is a headland of Portland and Purbeck limestone. It has created steep cliffs at Durlston as well as at Peveril Point (seen in the distance on the photo). However, the limestone is jointed, which has created lines of weakness that can be more easily eroded in places by marine and aerial processes.