How many groynes does Hengistbury Head have?
All four groynes have had new beacon markers installed. Further works to protect the headland, a scheduled Ancient Monument, included removing 46m of gabion revetment and replacing it with 255 new gabion baskets filled with stone at Double Dykes Beach.
Why is Hengistbury Head important?
The sand spit is known under several names including Mudeford spit, Mudeford beach and locally as the Island. Without Hengistbury Head it is probable that most of the town of Christchurch and all of Christchurch Harbour would cease to exist. Poole bay and Christchurch bay would merge and become one.
How many groynes are in Bournemouth beach?
The ambitous project includes plans to replace Bournemouth’s existing 53 groynes, construct three new groynes and to replace the groyne at Hengistbury Head which is known as the ‘Long Groyne’.
What is Hengistbury Head made of?
sandstone headland
Hengistbury Head is a sandstone headland attached to Southbourne, which is a suburb of the town of Bournemouth to the west; the nearest major settlement is Christchurch to the north. It is the most easterly part of the Borough of Bournemouth, and marks the most easterly point of Poole Bay.
What is the purpose of groynes on beaches?
A groyne functions as a physical barrier by intercepting sand moving along the shore. Sand is gradually trapped against the updrift side of the structure, resulting in a wider beach on this “supply-side” of the structure. However the downdrift beach is deprived of the sand trapped by the groyne and therefore it erodes.
What do groynes do on a beach?
Groynes trap sediments from longshore drift so that the coast behind the sand layer is protected from erosion. Their effectiveness depends on their extension into the river or sea.
How long is the walk at Hengistbury Head?
Hengistbury Head Walk – 3.7 Mile Easy Circular.
How do you pronounce hengistbury?
Phonetic spelling of Hengistbury
- Hengist-bury.
- hengist-bury. Hertha Graham.
- Hen-gist-bury. Maria Shezi.
What beaches use groynes?
The groynes in Kirra Beach, also known as the “big groynes” starts from the North and outstretch up to the Coolangatta beach on the south. In the beginning, there were people especially surfers who strongly disagree about the plan of building groynes as they believe it would affect the break of waves.
Are there fossils on Hengistbury Head?
Microfossils from Hengistbury Head are well known for the huge range of fossil seeds that can be found there.
What are the disadvantages of groynes?
Disadvantages
- Short lifespan.
- Reduces recreational value of beach.
- Reduction of longshore drift can lead to higher erosion rates downdrift (terminal groyne syndrome)
- Ongoing maintenance cost.
- Using tropical woods will mean it’s unsustainable.
How do groynes protect the beach?
What are disadvantages of groynes?
Wooden groynes are less durable than rock groynes. They can have a negative, visual effect on the landscape. Groynes prevent sediment being transported to beaches further down the coast and therefore increase the amount of erosion and sediment loss at those beaches.
How long do groynes last?
about 10-25 years
Wooden groynes have a lifetime of about 10-25 years; and groynes made of gabions of 1-5years.
Is Hengistbury Head dog friendly?
Well-behaved dogs are welcome at Hengistbury Head, but please respect that this is a nature reserve with plenty of rare and beautiful wildlife.
Is hengistbury beach dog friendly?
Hengistbury Head and Mudeford Sandbank
Dogs are welcome all year round on the sand and pebble beach which stretches all along the southern side of the headland.
How long is Hengistbury Head?
How high is Hengistbury Head?
about 36m
Hengistbury Head is a headland and hill of about 36m height situated between Christchurch Harbour and Poole Bay.
How can you tell if groynes are working?
The difference in height of the beach either side of the groyne will give an indication of the effectiveness of groynes in trapping material being transported by longshore drift. The more effective the groyne the greater the distance between beach levels either side of the groyne.
How was Hengistbury Head formed?
The layers of sands, gravels and clays that make up Hengistbury Head were formed around 65 million years ago beneath a warm tropical sea. This was the beginning of a very unstable period. Movements in the earth’s crust created the Alps and in southern England the land surface was gently folded.
How long do groynes last for?
What are positives of groynes?
Groynes
| Advantages | Disadvantages |
|---|---|
| Prevents longshore drift moving beach material along the coast. Allows the build-up of a beach. Beaches are a natural defence against erosion and an attraction for tourists. | They can be unattractive. Costly to build and maintain. |
What is the purpose of groynes?
The main function of a groyne is catching and trapping part of the sediment moving (mainly in a longshore direction) in the surf zone. As revealed by experiments, groynes partly dissipate energy of water motion during weak and moderate wave conditions, leading to accretion of the updrift shoreline.
Can dogs go on Mudeford ferry?
You can also get to Mudeford Sandbank and Hengistbury Head from the other direction, using the ferry from Mudeford Quay. Ferries run regularly and dogs travel free on this 5 minute crossing. From the ferry drop off, a beach café, toilets and the land train station are all just a short walk.
Are dogs allowed on Mudeford Quay?
Yes indeed it is a dog friendly place. Keep them on a lead if possible as the sea is very deep right up to the quay wall. It is a lovely spot to walk dogs and sit and admire the view. over a year ago.