1.2 Case studies Flashcards
Location of Hemsby
Hemsby is a village, seaside resort and civil parish in the county of Norfolk, England
Issues in Hemsby
- homes falling into the sea due to cliff erosion of very soft clay + sand in storms
- no sea defences - public funding refused, Hemsby not considered economically valuable enough
How have people in Hemsby responded?
- people are fundraising for sea defences
- helping people clear + evacuate coastal homes in storms
Impacts of erosion in Hemsby
- potential loss of the cultural history/identity of the town
- area is reliant on tourism, with many businesses by the sea
How has beach nourishment been used in Norfolk?
- in 2019, 2million m3 of sand was placed on the Norfolk coastline near Bacton
- aimed to prevent flooding of homes and businesses and protect Bacton gas terminal
- cost £20m - biggest contribution from Bacton Gas Terminal
Has the Norfolk beach nourishment been successful?
2 years on
- heavy storms caused waves to crash into sand and create a 2m drop
- sand has moved further down the beach, creating a sand bar that breaks waves’ energy
- has prevented flooding in gas terminal and nearby villages
Issues facing sand dunes in Berrow, Somerset
- sea buck thorn is an invasive species that outcompetes marram and needs to be removed manually
- trampling kills vegetation, causing blowouts in storms
- paths, roads, and walkways create weaknesses in dunes, which cause wind tunnels and flooding
Dune management in Berrow
- soft management: rerouting paths, boardwalks, porous collection, fencing
Dune management in Ynyslas, Wales
- management focused on educating public
- wooden paths
- free access to some areas, no access to others
- information centre
- warden
- allow school fieldwork to take place in some areas
Location of Keyhaven Marshes
-Hampshire
-Behind Hurst Castle Spit
- Western Solent
Describe the formation of Keyhaven Salt marshes
- developed due to formation and migration of Hurst spit
- spit is maintained by supply of shingle from west and longshore drift
- spit provides sheltered environment for mud flats and marshes to form
- spartina has led to marshes growing 2m higher than usual
why is the hurst spit receding?
- groynes and engineering works to the west
- increased storms
impacts of the recession of the hurst spit
- rapid erosion
- reduced height of spit
- breaches in the spit
- if not dealt with, the spit might’ve become isolated and marshes overwhelmed by marine attack
Impacts of declining spartina on Keyhaven salt mashes
- exposed slumping platforms of bare mud - vulnerable to erosion
- this would expose coast to wave attack, flooding habitats
Describe the Shoreline Management Plan used at Keyhaven Salt marshes
- marshes and hurst spit not totally independent so holistic approach needed
- 550m of rock armour protecting Western end at milford
- spit nourished with 300,000m3 of shingle
- 100m rock revetment at Eastern end to protect tip