portsmouth case study

Question 1

problems with low lying areas

Answer 1

gunwharf quays, old portsmouth, high value areas are low lying and at risk of fooding

Question 2

what coastal management scheme is going in place

Answer 2

1-3m sea walls going in place

Question 3

longshore drift patterns

Answer 3

some longshore drift towards the east, currents forcing current in opposite direction

Question 4

what sediment cell is portsmouth part of

Answer 4

sediment cell 5- portland bill for selsey bill

Question 5

what are sediment cell boundaries on

Answer 5

headlands mostly, or major estauries

Question 6

how many subcells in the sediment zone

Answer 6

9 sub cells

Question 7

inputs of sediment

Answer 7

east winner bank feeding eastney spit

Question 8

outputs

Answer 8

strong tidal currents from langstone and portsmouth harbour

Question 9

what happens to materials at portsmouth harbour

Answer 9

material dredged to allow ships to pass safeley to a sediment sink in the solentwh

Question 10

what human input happens

Answer 10

sediment moved from beaches to other beaches

Question 11

geology

Answer 11

bracklesham beads, chalk, clays, sands

Question 12

where is old portsmouth

Answer 12

south of gunwharf

Question 13

if protected how much money of benefits does old portsmouth have

Answer 13

£30 million

Question 14

how many historic building in old portsmouth

Answer 14

over 300`

Question 15

historic flood event year

Answer 15

1989

Question 16

what did the inundation map show

Answer 16

a 1 in 5 year event would flood old portsmouth meaning defences must go in

Question 17

what did DEFRA give to manage old portsmouth

Answer 17

£2.24 million

Question 18

what defences were put in by DEFRA for old portsmouth

Answer 18

• rock revetment and scour apron
• round tower sheet piling/ concrete
• floodgates
• varieous reinforced concrete retaining walls
• various extensions/buttresses
• dockside coping beam and associated works
• floodboarding

Question 19

were the management strategies effective

Answer 19

yes until 2024

Question 20

why are defences not at modern as they need to be

Answer 20

being eroded and walkways crumbling on sea wall

Question 21

what is farlington marshes

Answer 21

nature reserve and the SSSI (site of specific sciencific interest)

Question 22

what areas are being impacted by southsea coastal sceme

Answer 22

• long curtain moat
• clarence pier
  -southsea common

Question 23

how much sea level rise could happen by 2100

Answer 23

between 1-6.5 m

Question 24

when is southsea coastal scheme meant to be done by

Answer 24

2028

Question 25

coastal squeeze- farlington marshes

Answer 25

sea wall in place so the salt marsh cannot move backward when sea level rises

Question 26

cost of southsea coastal scheme

Answer 26

£180 million