FEATURES OF SEA EROSION AND DEPOSITION

Slides:

Advertisements

Similar presentations

WS 7.1, Page 21 1a) Strength of wind and fetch affect the size of waves. The stronger to wind, the larger the size of waves. The longer the distance over.

Advertisements

Coastal Erosion and Management At Reculver In Kent

OCEAN WAVES CHANGE COASTLINES.

Coastal Landforms around Fairlight Head. Joints / Geos / Inlets Wave attack picks out weaknesses in the cliff Hydraulic action (compression of air in.

Higher Coasts Lithosphere

Coastal Processes & Landforms

GCSE COASTS. COASTAL EROSION Erosion Processes 1.Corrasion / Abrasion 2.Scouring 3.Hydraulic Action 4.Solution 5.Attrition.

2.4 How do coastal processes shape the land? Part B.

COASTAL LANDFORMS.

THE SEA LEARNING OUTCOMES TODAY WE ARE GOING TO LEARN ABOUT THE ACTION OF THE SEA. AT THE END OF THIS CHAPTER YOU WILL BE ABLE TO DISCUSS THE DIFFERENT.

Geography - Coasts.

The Sea Creator and Destroyer.

Section 2: Wave Erosion Preview Key Ideas Shoreline Erosion Beaches

1.5Understand how ocean waves and currents change the face of coastal areas.

WAVES. HOW DO WAVES FORM =The energy in waves come from wind that blows across the water’s Surface.

 Demonstrate an understanding of wave processes in eroding a coastline and re-sorting and depositing materials removed through erosion. Candidates should.

The Sea Surface Processes. The Sea has three processes Erosion Transportation Deposition.

Welcome to Science 11/29 Come up to the cart and carefully select a cup of water.

Coastal Erosion Features. Coastal Erosion Processes Coastal erosion processes create a number of significant landforms. There are a number of factors.

1.5Understand how ocean waves and currents change the face of coastal areas. (Chapter 3)

By Wind and Waves. Review Any natural process that removes sediments and carries them away from one place to another is called erosion. Gravity is the.

Coastal Erosion Processes:

Geography - Coasts By Charlotte Hayward. Contents Introduction Headlands Bays HAAC Processes Parts of a Wave Types of Waves Cave, Arch, Stack Formation.

Coastal Environments How the coast is eroded Landforms of coastal erosion Transport and deposition of material Coastal management issues Sustainable development.

Sec 2 IDS, 2010 Coastal Management. Coastal processes Erosion, transportation and deposition These processes are influenced by waves and currents.

Wave Erosion and Deposition

Erosion and Deposition

Coastal Processes. - Creating waves - Constructive waves - Destructive waves - Processes of erosion - Processes of transportation - Longshore drift -

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.

What are sub-aerial processes and why are they important? What processes of erosion operate at the coast? What landforms are created by erosion? What.

Coastal Landforms. - Cliffs and wave cut platforms - Beaches - Caves, arches, stacks and stumps - Headlands and bays - Spits - Summary.

Warm Up 1)Which of the following is a tidal current? a. spring tidec. neap tide b. flood tided. both a and c 2)The smallest daily tidal range occurs during.

What forces shape a shoreline?

COASTAL EROSIONAL AND DEPOSIONAL FEATURES

Coasts. Wave erosion coasts formed by the force of waves as they strike the land the waves strike the land and pieces of rock are broken off the wave.

Coastal landforms LS: Explain the formation of erosional coastal landforms using vast key words. Describe the process of longshore drift and describe the.

Erosion and Deposition

Headlands and Bays Coastal Features

Wave action and coastal landforms

Shoreline Features and Processes

Coastal landforms - revision

By Angelos Petrou & Christos Kathidjiotis

Physical Geography Must be familiar with The sea Rivers Glaciation

Theme 2. The natural environment 2. 1 Plate tectonics 2

Coastal landforms - revision

Waves and the Shore.

Lesson 2: Waves and Coastal Landforms

Go through and highlight important information.

Physical Landscapes in the UK

Shoreline Features.

Wave Cut Platform Formation Fig 18.4 p301 Add in the Retreating cliff

The Restless Ocean.

The Big Geography Quiz of the Year

What type of waves will erode the coastline?

Transportation and deposition

Lithosphere / Rural Land / Exam Technique

Waves Section 9.5.

Coastal Landforms: Erosional and Depositional

Deposition by the sea.

Headlands and Bays Coastal Features

Wave Erosion Chapter 4.3.

Coastal Processes.

Presentation transcript:

FEATURES OF SEA EROSION AND DEPOSITION COASTAL LANDFORMS FEATURES OF SEA EROSION AND DEPOSITION

WAVES Size and type of wave will depend on the FETCH and wind speed. Destructive waves – BACKWASH is stronger than the SWASH. Destructive waves form features of erosion. Constructive waves – SWASH is stronger than the backwash. Constructive waves form features of deposition.

EROSIONAL PROCESSES Hydraulic Action – power of wave carries away any loose material. Abrasion – Waves use their load to break rock down into smaller fragments. Solution – water dissolves soft rock. Compressed Air- tiny little explosions within cracks due to trapped air.

Erosion rates depend on: Rock Type Degree of exposure Amount of protective interference by man Wave Type Slope of shoreline

Features of sea erosion Bay and Headland Cave / Arch / Stack Sea Cliff

Formation of bay and headland Bands of hard and soft rock eroded at different rates – Differential Erosion. Processes at work : hydraulic action / abrasion / solution / compressed air. Hard rock stands out as headlands and soft rock retreats inland to form bays. Wave refraction occurs as bays retreat so headlands receive more high energy waves. Example – Howth Head and Dublin Bay.

Formation of cave, arch, stack. Waves attack weak areas of exposed rock. Processes at work????? Cave cut into base of cliff/ deepened by abrasion. Cave extends through to other side of headland forming an arch. Erosion and gravity cause roof of cave to collapse forming a stack. Continuous erosion creates a sea stump. Example – Old Head Of Kinsale, Co. Cork.

Formation of Sea Cliff. Destructive waves attack coast. Processes at work ???? Notch carved out and enlarged. Upper slope unsupported/ undermining occurs. Due to erosion, weathering and gravity, slope collapses forming a steep face. Cliff retreats and increases in height. Rock left at base of retreating cliff is a wave cut platform. The bigger the platform – the less rate of erosion. Example – Cliffs of Moher, Co. Clare.

SEA CLIFFS

Marine Transportation Longshore Drift – movement of material along the coast in a zig-zag pattern. Swash moves material up the beach. Backwash moves sediment back into the sea.

Formation of a Beach. Formed by constructive waves. Weak backwash allows material to build up higher up the shore and finer material is left closer to shoreline. Beach forms between high and low water marks. Sections of beach include sandy area/ shingle area and storm beach. Example – Skerries.

Formation of Sand Spit. Long ridge of sand and shingle deposited along entrance to sheltered bay. Constructive waves and longshore drift. Waves hit obstacle/ lose power / deposit load. Builds up above sea level across entrance to bay. Wave refraction may cause spit to curve inwards towards bay= Recurved spit. Example – Portmarnock, Dublin.

Formation of a Tombolo. Island connects to mainland due to deposition. Constructive waves and longshore drift. Wave refraction at island causes currents to converge / deposit load. Example – Howth to Sutton.