✅Case Study - Slapton Line Management Flashcards Preview

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Flashcards in ✅Case Study - Slapton Line Management Deck (29)
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1

What is the Slapton Line?

The fragile shingle bar which runs between Slapton Ley and the sea

2

Where is Slapton Sands?

Kingsbridge, South Devon, UK

3

Why is the shingle barrier under threat?

Erosion rates are increasing

4

Where are coastal management strategies installed around the area?

Slapton, Torcross and Beesands

5

How long is the shingle barrier?

7km

6

What defences are in place at Torcross?

A Sea wall

7

When was the sea wall at Torcross built?

1979

8

What happened to the Torcross sea wall in 2001?

It was partially destroyed by a storm and large amounts of sediment were washed away

9

What happened to the sea wall at Torcross in 2014?

The wall collapsed during a storm and the beach was built up again in order to protect it

10

What happened to the Slapton Line after the 2014 storm?

The worst affected section of the road was realigned

11

What length of the road was realigned in 2014?

200m

12

How much shingle was transported from the Strete Gate area to Slapton?

12,000 tonnes

13

What was created on the beach at Slapton for protection?

Shingle bastions

14

How effective were the shingle bastions?

Only for the short term, as up to 45% was washed away in a storm in 2008

15

What defences are in place at Beesands?

A sea wall and rock armour

16

When was the rock armour put in place at Beesands?

2016

17

How much rock was imported to build the Beesands rock armour?

2-4 tonnes

18

Why was the rock armour put in place at Beesands?

To try and stop the wall from being undercut and collapsing again

19

What happened to the Torcross sea wall in 2016?

It collapsed

20

How much was spent by the South Hams council on emergency flooding funding?

£250,000

21

How much did repairs to the wall in 2017 cost?

£2.4 million

22

How much steel and concrete was used to reinforce the wall?

713 tonnes of steel and 221m3 of concrete

23

How much shingle was washed away from Torcross in 2015?

27,000 tonnes in one night

24

How much did the shingle at Torcross cost?

£250,000

25

How much shingle was lost from the Slapton Line in the storms of 2000/2001?

5m from a 1000m stretch of beach

26

What was initially used to protect the road after the 2000/2001 storm?

3000 tonnes of rock armour, later removed due to damage to the SSSI

27

Why was Hallsands destroyed?

Due to dredging of shingle in the early 20th century from the sediment cell, which is virtually closed

28

What are the long term issues with these management strategies?

The intensive management may cause damage to vegetation and should the barrier be breached, the Slapton Ley lagoon may be destroyed. The strategies are also incredibly expensive to maintain

29

How much sediment transport occurs on the beach at Slapton?

Next to none.