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The Holderness Coastline –
                        The Management of Coastal Erosion

                                             Holderness is a lowland region of England
                                             that lies between the chalk hills of the
                                             Wolds and the North Sea. It is part of the
                                             East Riding of Yorkshire.

                                             The Holderness Coast is one of Europe's
                                             fastest eroding coastlines. The average
                                             annual rate of erosion is around 2 metres
                                             per year. The main reason for this is
                                             because the bedrock is made up of till. This
                                             material was deposited by glaciers around
                                             12,000 years ago.




Information source: The University of Hull
What processes are acting upon this coastline?




  Geology Map of Holderness
                                    Altitude Map of Holderness


How might the geology of the area affect the shape of the
coastline?
What processes are acting upon this coastline?

      The Holderness Coastline is made up of soft boulder clays (tills) left after the
      retreat of the Devensian ice sheets about 12 000 years ago. They can be seen
      on the coast, being rapidly eroded by the sea. To look at, they are a mass of
      brown clay containing pieces of rock (erratics) brought here by the glaciers from
      Scandinavia, Scotland, the Lake District and Northeast England. These
      soft, recent deposits sit on a platform of chalk which slopes away gently to the
      east.




Erratics in till at Mappleton
What processes are acting upon this coastline?

Erosion of the Holderness cliffs is a cyclic, four stage process:

    1.   The soft Boulder Clay cliffs become saturated with rain water and lose their
         strength.
    2.   The cliff is too steep and fails either as a block of material or as a slurry slide
    3.   Cliff failure reduces the angle and prevents further erosion but …
    4.   Large waves from the North East remove the debris in longshore drift to the
         South and the cliff oversteepens, rain falls and the cycle begins again.
The order of this presentation…




1.   Flamborough Head.

2.   Mappleton

3.   Aldbrough

4.   Withernsea

5.   Kilnsea

6.   Spurn Head
1. Flamborough Head
The chalk of Flamborough is a resistant rock that provides examples of erosion,
features such as caves, arches and stacks. The chalk has formed a headland.
2. Mappleton
Situated approximately 3km south of Hornsea lies the village
of Mappleton. Supporting approximately 50 properties, the
village has been subject to intense erosion at a rate of 2.0m
per year, resulting in the access road being only 50m from
the cliff edge at its closest point.

Mappleton lies upon unconsolidated till (boulder clay). This material
was deposited by glaciers during the last ice age 12,000 years ago.
Mappleton
   Mappleton is an excellent case study of an attempt at coastal management. In 1991 two
   rock groynes and a rock revetment made from huge blocks of Scandinavian rock were
   built.
   As a consequence a substantial beach accumulated between the groynes halting erosion
   (picture 1 below). However, further south the rate of erosion has increased significantly
   (picture 2 below). This is because material which is being carried south is not being
   replaced (it is trapped within the groynes). Therefore there is no beach to protect the cliffs.
   Even during a neap tide ( a tide which is 30% less than the average tidal range) the sea
   reaches the base of the soft cliffs and erosion occurs.

1 Cliffs to the north. Sea defences mean            2 Cliffs to the south. The sea defences
that the beach has grown and the cliffs are         don’t protect this area and the land is
stable (look at the grass growing!)                 retreating rapidly.
Mappleton


Northern section                        Southern section
Defences = Beach build up               No defences = Beach erosion
3. Aldbrough
Aldbrough is a small settlement to the south of Mappleton.
Where Mappleton had substantial sea defences built,
Aldbrough has none. The cliffs here are rapidly eroding.


Some residents think that the sea defences at Mappleton has
made things worse. Why would they think this?
Aldbrough
4. Withernsea
This settlement attracts tourists, so substantial sea
defences have been constructed to maintain the beach.

How many sea defences can you see in this picture?
Withernsea – how does it all work?
5. Kilnsea

The old settlement of Kilnsea has now been completely
lost. Sea defences were built here in the early 1900s to
protect the Godwin Battery - a defensive gun emplacement
and the rail-head for a light railway to further military
installations on Spurn point. The sea defences are now
crumbling and erosion is progressing rapidly.
Kilnsea

Old map of Kilnsea       Current aerial photo of Kilnsea
6. Spurn Head

The area known as Spurn forms the southern extremity of the Holderness coast and includes
the unique feature of Spurn Head, a sand and shingle spit 5.5km long, reaching across the
mouth of the Humber. Spurn is made up of the material which has been transported along
the Holderness Coast. This includes sand, sediment and shingle.




                                                  Spurn Point provides evidence of
                                                  longshore drift on the Holderness
                                                  Coast. It is an excellent example of
                                                  a spit.



                                                  How would sea defences along
                                                  the coastline affect Spurn?
Spurn Head
1.   The material eroded from the Holderness cliffs is swept southwards.
2.   North easterly waves move the coarser sands and gravel down towards the mouth of the
     Humber
3.   The finer sands and clays are swept offshore and continue southwards towards the Wash.
4.   Spurn Head ‘hangs like a rudder’ for six kilometres off the end of Holderness, built by the
     sands and gravels eroded from the cliffs and transported south by longshore drift
5.   In the past Spurn Head
     seems to have grown and
     been washed away in a
     regular cycle, slowly moving
     towards the east to keep
     pace with the erosion of the
     Holderness cliffs.
6.   For over 100 years the
     position of Spurn has been
     fixed by artificial sea
     defences. These defences
     are now falling into disrepair
     and the sea is starting to
     erode parts of the peninsula
     once again.
Spurn Head
Spurn Head changes position. Most of the spit has
flexible road surfaces, which are like mats that can be
picked up and moved following major storms.




                                                      There is plenty of evidence of this
                                                      movement. Former railway tracks that
                                                      were built to move building materials
                                                      along Spurn (for the building of Bull
                                                      Fort in the Humber Estuary) now
                                                      appear to lead into the sea.
Spurn Head
Is Spurn eroding?



 The end of Spurn is fairly stable. This is due to
 it’s size and the presence of deep rooted plants.




The rest of Spurn erodes and moves constantly.
There are some groynes to protect it, but these
are very old now.
Spurn Head
                   Is it important to protect access to Spurn Point?




Full time lifeboat men live here with their     The Humber estuary is very busy with
families.                                       large ships. It is one of the most
                                                dangerous estuaries in Europe, so pilots
                                                guide boats in and out. Their base is on
                                                Spurn for quick access to sea. The pilots
                                                do not live on Spurn.




                                      Spurn is also important for birds and wildlife.
The future?

 Many key industries, farms and homes lie within 50 meters of the
 coastline.

                   Oil terminal                 Lifeboat Station
1. Should they
   be saved?

2. What effects
   would
   saving
   these have
   on other
   areas of the   Wind turbines                  Humber
   coastline?                                    Pilots
3. Who should
   pay?
How can the coastline be protected?
  Hard engineering techniques aim to stop coastal processes
  from occurring. Soft engineering methods try to work with
  nature to protect the coast.
What has been done to protect Swanage?
   What is the purpose of each scheme at Swanage?
   Match the correct scheme to its purpose!

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Coastal Erosion in Holderness: Managing the Fastest Eroding Coastline in EuropeTITLE The Holderness Coast: Understanding and Addressing Rapid Coastal Erosion in Yorkshire, England TITLE Case Studies in Coastal Management: How Communities are Coping with Erosion along the Holderness CoastTITLE Geological and Coastal Processes Shaping the Holderness Coastline of Yorkshire, EnglandTITLE Coastline Dynamics and Defenses along the Eroding Holderness Coast of East Yorkshire

  • 1. The Holderness Coastline – The Management of Coastal Erosion Holderness is a lowland region of England that lies between the chalk hills of the Wolds and the North Sea. It is part of the East Riding of Yorkshire. The Holderness Coast is one of Europe's fastest eroding coastlines. The average annual rate of erosion is around 2 metres per year. The main reason for this is because the bedrock is made up of till. This material was deposited by glaciers around 12,000 years ago. Information source: The University of Hull
  • 2. What processes are acting upon this coastline? Geology Map of Holderness Altitude Map of Holderness How might the geology of the area affect the shape of the coastline?
  • 3. What processes are acting upon this coastline? The Holderness Coastline is made up of soft boulder clays (tills) left after the retreat of the Devensian ice sheets about 12 000 years ago. They can be seen on the coast, being rapidly eroded by the sea. To look at, they are a mass of brown clay containing pieces of rock (erratics) brought here by the glaciers from Scandinavia, Scotland, the Lake District and Northeast England. These soft, recent deposits sit on a platform of chalk which slopes away gently to the east. Erratics in till at Mappleton
  • 4. What processes are acting upon this coastline? Erosion of the Holderness cliffs is a cyclic, four stage process: 1. The soft Boulder Clay cliffs become saturated with rain water and lose their strength. 2. The cliff is too steep and fails either as a block of material or as a slurry slide 3. Cliff failure reduces the angle and prevents further erosion but … 4. Large waves from the North East remove the debris in longshore drift to the South and the cliff oversteepens, rain falls and the cycle begins again.
  • 5. The order of this presentation… 1. Flamborough Head. 2. Mappleton 3. Aldbrough 4. Withernsea 5. Kilnsea 6. Spurn Head
  • 6. 1. Flamborough Head The chalk of Flamborough is a resistant rock that provides examples of erosion, features such as caves, arches and stacks. The chalk has formed a headland.
  • 7. 2. Mappleton Situated approximately 3km south of Hornsea lies the village of Mappleton. Supporting approximately 50 properties, the village has been subject to intense erosion at a rate of 2.0m per year, resulting in the access road being only 50m from the cliff edge at its closest point. Mappleton lies upon unconsolidated till (boulder clay). This material was deposited by glaciers during the last ice age 12,000 years ago.
  • 8. Mappleton Mappleton is an excellent case study of an attempt at coastal management. In 1991 two rock groynes and a rock revetment made from huge blocks of Scandinavian rock were built. As a consequence a substantial beach accumulated between the groynes halting erosion (picture 1 below). However, further south the rate of erosion has increased significantly (picture 2 below). This is because material which is being carried south is not being replaced (it is trapped within the groynes). Therefore there is no beach to protect the cliffs. Even during a neap tide ( a tide which is 30% less than the average tidal range) the sea reaches the base of the soft cliffs and erosion occurs. 1 Cliffs to the north. Sea defences mean 2 Cliffs to the south. The sea defences that the beach has grown and the cliffs are don’t protect this area and the land is stable (look at the grass growing!) retreating rapidly.
  • 9. Mappleton Northern section Southern section Defences = Beach build up No defences = Beach erosion
  • 10. 3. Aldbrough Aldbrough is a small settlement to the south of Mappleton. Where Mappleton had substantial sea defences built, Aldbrough has none. The cliffs here are rapidly eroding. Some residents think that the sea defences at Mappleton has made things worse. Why would they think this?
  • 12. 4. Withernsea This settlement attracts tourists, so substantial sea defences have been constructed to maintain the beach. How many sea defences can you see in this picture?
  • 13. Withernsea – how does it all work?
  • 14. 5. Kilnsea The old settlement of Kilnsea has now been completely lost. Sea defences were built here in the early 1900s to protect the Godwin Battery - a defensive gun emplacement and the rail-head for a light railway to further military installations on Spurn point. The sea defences are now crumbling and erosion is progressing rapidly.
  • 15. Kilnsea Old map of Kilnsea Current aerial photo of Kilnsea
  • 16. 6. Spurn Head The area known as Spurn forms the southern extremity of the Holderness coast and includes the unique feature of Spurn Head, a sand and shingle spit 5.5km long, reaching across the mouth of the Humber. Spurn is made up of the material which has been transported along the Holderness Coast. This includes sand, sediment and shingle. Spurn Point provides evidence of longshore drift on the Holderness Coast. It is an excellent example of a spit. How would sea defences along the coastline affect Spurn?
  • 17. Spurn Head 1. The material eroded from the Holderness cliffs is swept southwards. 2. North easterly waves move the coarser sands and gravel down towards the mouth of the Humber 3. The finer sands and clays are swept offshore and continue southwards towards the Wash. 4. Spurn Head ‘hangs like a rudder’ for six kilometres off the end of Holderness, built by the sands and gravels eroded from the cliffs and transported south by longshore drift 5. In the past Spurn Head seems to have grown and been washed away in a regular cycle, slowly moving towards the east to keep pace with the erosion of the Holderness cliffs. 6. For over 100 years the position of Spurn has been fixed by artificial sea defences. These defences are now falling into disrepair and the sea is starting to erode parts of the peninsula once again.
  • 18. Spurn Head Spurn Head changes position. Most of the spit has flexible road surfaces, which are like mats that can be picked up and moved following major storms. There is plenty of evidence of this movement. Former railway tracks that were built to move building materials along Spurn (for the building of Bull Fort in the Humber Estuary) now appear to lead into the sea.
  • 19. Spurn Head Is Spurn eroding? The end of Spurn is fairly stable. This is due to it’s size and the presence of deep rooted plants. The rest of Spurn erodes and moves constantly. There are some groynes to protect it, but these are very old now.
  • 20. Spurn Head Is it important to protect access to Spurn Point? Full time lifeboat men live here with their The Humber estuary is very busy with families. large ships. It is one of the most dangerous estuaries in Europe, so pilots guide boats in and out. Their base is on Spurn for quick access to sea. The pilots do not live on Spurn. Spurn is also important for birds and wildlife.
  • 21. The future? Many key industries, farms and homes lie within 50 meters of the coastline. Oil terminal Lifeboat Station 1. Should they be saved? 2. What effects would saving these have on other areas of the Wind turbines Humber coastline? Pilots 3. Who should pay?
  • 22. How can the coastline be protected? Hard engineering techniques aim to stop coastal processes from occurring. Soft engineering methods try to work with nature to protect the coast.
  • 23. What has been done to protect Swanage? What is the purpose of each scheme at Swanage? Match the correct scheme to its purpose!