Sandbanks Flashcards
Where is Sandbanks located?
The South coast of England in Dorset. It separates Poole harbour from Poole bay
Why does Sandbanks need management? (2 reasons)
- high number of high value properties and hotels (e.g Sandbanks hotel) which provide employment and generate spending in the local economy
- Residential properties are in high demand and fetch high prices
Why does Sandbanks need management? (2 reasons)
- The beach is a major tourist attraction as it has a gentle slope and blue flag status
- Popular for water sports (e.g water skiing, sailing) due to the protection provided by Poole harbour and also houses yacht clubs and marinas which provide money to the local economy
Why does Sandbanks need management? (2 reasons)
- The entrance Poole Harbour is used by cross channel ferries and commercial ships (carrying goods such as timber) LSD of the beach could cause the harbour to become clogged
- Climate change means the sea level will rise leaving Sandbanks vulnerable to flooding and could cut the peninsula off from the mainland
What is the sea rise likely to be in this area?
0.6m in the next 100 years
What is the estimated cost in loss of properties due if no management strategies were applied?
£18m
What is the house price of detached houses?
Over £10m
What management strategies have been used?
- Wooden groynes
- Beach Recharge
How many wooden groynes were constructed?
10
How much did each groyne cost?
£100,000
How many rock groynes were constructed?
5
Why were rock groynes constructed?
- To maintain a wide, deep beach
- To minimise LSD which could otherwise block up the harbour
- They absorb wave energy, which reduced erosion
- More sand means more friction which also reduces wave energy and erosion
What is beach recharge?
Offshore sand is sprayed onto the beach
How much does beach recharge cost?
£20 per m3
Why has beach recharge been used?
Conserves the beach and helps to increase beach size
Without groynes what would the rate of erosion be?
1.6m per year
Why managed?
- Residential properties in high demand
- Beach is major tourist attraction
- peninsula acts as entrance to Poole harbour and is used by boats. Without management, LSD beach sediment makes it shallow
- climate change and rising sea levels could cause flooding without management and could destroy properties. Without management it is estimated that 18 million of damage would occur over the next 20 years.
How managed?
- rock groynes are installed to maintain deep wide beach. This minimises movement of sediment along beach by LSD. It also absorbs wave energy and reduces rate of erosion. W/out rock groynes erosion rates - 1.6m/year
- beach recharge is also used to preserve beach. Sand dredged from offshore reserves sprayed onto beach so cross section increased. In total over 3.5 million m^3 of sediment added
