case study- coastal landscape management

Question 1

where is the place of study

Answer 1

sandbanks, dorset

Question 2

what is poole bay

Answer 2

A 16 km long section of open coastline, stretching from sandbanks peninsula to hengisbury head

Question 3

where is the seawall in timber groynes found?

Answer 3

at the central section of Bay
-Westcliff, through Central, Bournemouth, Boscombe and Southbourne to point house Café

Question 4

what management strategies are used in Boscombe?

Answer 4

-construction of a £2 million artificial reef at east of Boscombe pier in 2009
-made up of geotextile sandbags up to 30 m long, which raises the beach profile
-during this time, the council took advantage of beach replenishment scheme to deposit extra sand across beach to east of Boscombe pier

Question 5

what happened between alum Chine and Warren Hill?

Answer 5

-2006, they re-nourished with 650,000 m² of beach material from Poole Harbour dredging operation
-A further 897,000 m² from a licensed dredging area of the Isle of Wight in 2007
-first of three annual top ups added in March 2008 of 70,000 m³

Question 6

Where are concrete revetments found and how do they work?

Answer 6

-sandbanks
-they stopped waves hitting base of soft cliff in aims to reduce erosion and absorb wave energy and preserve the existing coastline

Question 7

who is the responsibility of management down to?

Answer 7

-poole harbour commissioners
-poole borough Council
-Environment agency
-Strategies from two bays shoreline management plan

Question 8

what does sandbanks use strategies from?

Answer 8

-hold the line(maintains defences, sustain defences and improves existing defences)
-Managed realignment(existing defences moved to more sustainable positions, usually further in land
-No active intervention(areas of low economic value or high, environmental value and not protected)

Question 9

what are the six needs for management?

Answer 9

-Has a large number of high value commercial properties built on it
-Residential properties are high in demand and command premium prices
-Beaches is a major tourist attraction
-Provides protection, shelter from waves from poole Harbour
-At the end of the peninsula is the entrance to poole harbour
-climate change means rising sea levels

Question 10

What are two names of high value commercial properties on sandbanks and what do they do to the economy?

Answer 10

-sandbanks Hotel
-Haven Hotel
-Provide employment and generate spending in the local economy

Question 11

sandbanks needs managing due to residential properties being high in demand, why?

Answer 11

-4th most expensive in the world /m^2
-large detached house price in excess of £10 million
-Luxury Apartments costing over £2 million

Question 12

why is the beach a major tourist attraction?

Answer 12

-It has a blue flag award for water quality
-it has a gently sloping beach, so good for family swimming

Question 13

Why does poole harbour need protecting?

Answer 13

-is a popular safe space for watersports like sailing and windsurfing
-The harbour is home to multiple yacht clubs in marinas such as salterns

Question 14

what could longshore drift do to the entrance of poole Harbour?

Answer 14

Longshore drift of beach sediment could cause the entrance to become clogged or shallow meaning cross channel ferries and catamarans won’t be able to use the entrance.

Question 15

what could climate change cause in the future?

Answer 15

-Sea level rise, predicted to be 0.6 m in the next hundred years
-Flooding of many properties
-could breach peninsula at its lowest narrowest point, which is only 2 m above sea level and 50 m wide at the junction of shore Road and Banks Road
-This could cut off the end of the peninsula from the mainland

Question 16

what property damage is predicted if there’s no management

Answer 16

-£18 million of property damage in the next 20 years

Question 17

what are the two main management strategies?

Answer 17

-Rock groynes
-beach recharge

Question 18

what impact does rock groynes have on sandbanks?

Answer 18

-they help minimise movement of sediment along the beach at sandbanks by longshore drift
-this restrict sediment from entering the harbour entrance keeping access free for shipping, but also absorbs wave energy and reduces erosion rates by 1 m per year

Question 19

what impact does beach recharge have on sandbanks?

Answer 19

-used to conserve beaches
-Sanders dredged from offshore and sprayed onto the beach. This is known as “rainbowing” and added to its size.
-currently cost £20/m^3
— but they found a cheaper option in 2015 at £3/m^2
-Natural current will transport sand on shore. but in 2018 the review suggested only 3% of 30,000 m³ of sediment dumped offshore had reached the beach after 18 months

Question 20

What’s the total sediment added to poole Bay beaches?

Answer 20

3.5 million m³