How fast is the Holderness coast eroding?

Answer 1

The Holderness coast is located in the north east of England. This is one of the most vulnerable Coastlines in the world, retreating at a rate of one to two meters a year. There are two causes of the problem.

• Strong prevailing winds create a long shore drift that moves material southwards along the coast.
• The cliffs are made of soft clay, so they will erode quickly.

The village of Mappleton, perched on the cliff top, has approximately 50 properties. As the cliff is eroded away, the village is under threat. In 1991, the decision was taken to protect the settlement of Mappleton, along the Holderness coast, south of Hornsea. A coastal management scheme costing £2 million was introduced. This involved two types of hard engineering: placing rock armor along the base of the cliff and building two rock groynes.

Answer 2

at a rate of one to two metres every year.

• Strong prevailing winds creating longshore drift. that moves material south along the coastline.
• The cliffs are made of a soft boulder clay. It will therefore erode quickly, especially when saturated.

Answer 3

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.

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.

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.

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 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 defenses mean that the beach has grown and the cliffs are stable (look at the grass growing!)

2 Cliffs to the south. The sea defenses don't protect this area and the land is retreating rapidly.

Aldbrough is a small settlement to the south of Mappleton. Where Mappleton had substantial sea defenses built, Aldbrough has none. The cliffs here are rapidly eroding.

Some residents think that the sea defenses at Mappleton has made things worse. Why would they think this?

This settlement attracts tourists, so substantial sea defenses have been constructed to maintain the beach.

How many sea defenses can you see in this picture?

The old settlement of Kilnsea has now been completely lost. Sea defenses 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 defenses are now crumbling and erosion is progressing rapidly.

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.

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 defenses. These defenses are now falling into disrepair and the sea is starting to erode parts of the peninsula once again.

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.

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.

The Humber estuary is very busy with 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.

Answer 4

the holderness coastline is being protected by sea defenses such as groynes, sea walls, and large rocks. but these can lead to erosion somewhere else down the coast.

Answer 5

This site has great info on Holderness http://www.herb.hull.ac.uk/erosion/index.htm

Answer 6

the holderness coast is protected by a £6000 concrete sea wall to defend the coasts and town.

Answer 7

Sea defenses are being built at strategic places along the coast.

Answer 8

Headland,Spits and one more that i cant remember

Answer 9

spurn head spit

Answer 10

It is getting eroded, and fast!