F761 coasts case studies

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  • Created by: charlie
  • Created on: 21-02-14 19:58

HOLBECK HALL, SCARBOROUGH - mass movement

5th June 1993 

  • boulder clay cliffs = rapid erosion
  • previous drought then intense rain 
  • weight of hotel added 
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SHREWSBURY - local flood management

BACKGROUND FACTS 

  • 100,000 population 
  • centre in middle of horseshoe meander of RIVER SEVERN f

FLOOD 

  • Autumn 2000 3 floods 

IMPACTS 

  • loss of properties / business / insurance / transport 

RESPONSE SCHEMES 

  • pre 2000 - dredging, diversion channels 
  • post 2000 - floodwalls , embankments , (sheet steel 6m underground) 
  • protected 74 houses FEB 2006 
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FLAMBOROUGH HEAD, HOLDERNESS - mass movement

  • BOULDER CLAY infront of CHALK 
  • flamborough head made from - CHALK (hard rock) 
  • BOULDERS in boulder clay used as abrasives 
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ALDEBURGH SOUTH - sea defences

1990-1991

1 KM - £4.9 M 

  • RECURVED SEA WALL
  • CONCRETE STEPPED APRON (sea dredged shingle 75,00m3)
  • FIBRE STRIP - (hard reinforced rubber reducing abrasive energy of riprap)
  • RIP RAP - (51,000 tonnes norweign granite)

TODAY 

  • BEACH NOURISHMENT - (buried sea wall)
  • WOODEN GROYNES 
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DUNGENESS - cuspate foreland

  • LSD from opposite ways brings sediments together 
  • large angle between waves + coastline = sediment converges, accumulates + forms beach ridges 
  • forms over time as result of continued ACCRETION + PROGRADATION 

MAP 

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CHESIL BEACH - tombolo

  • spit joins mainland to island 
  • FLANDRIAN TRANSGRESSION - 'waves in rising sea comb debris/material up onto coast'
  • shingle moves landwards + deposits as energy slows 

MAP 

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DURDLE DOOR - rock arch

PORTLAND STONE - specific type of limestone formed after Jurassic period 

  • hard layers of PORTLAND LIMESTONE folded so almost appear vertical 
  • inital breach of HARD ROCK then SOFTER ROCK behind erodes at faster rate 

MAP 

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LULWORTH COVE - dorset

CHALK / SANDSTONE / LIMESTONE / CLAY 

  • rock layers fold resulting in almost vertical shape 
  • HARD ROCK (portland + purbeck stone) initially breached so SOFTER ROCKS (wealden clay, gault, chalk + greensand) exposed to erosion + break away at faster rate 

MAP

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POOLE HARBOUR, DORSET - coastal management

WARHAM, DORSET 

  • 2nd largest natural harbour in the world 
  • 18 SSSI + nature conservation 
  • 3600 ha 

MANAGEMENT ISSUE 

  • inc. human pop. + tourists put pressure on wildlife + landscapes 
  • many different uses conflict 
  • illegal fishing 
  • marine + terrestrial litter 
  • anchoring 
  • low flying aricraft - no fly zones 

4 rivers drain - FROME / PIDDLE / CORFE / SHERFORD 

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POOLE HARBOUR, DORSET (2)

TOURISTS 

  • £158M 2002 / 510,000 ft2 / 110 retail stores 

INDUSTRY - sunseekers £160 M + employes 1,800 local people / Wytch farm oil extractions 

TRANSPORT 

  • thin harbour entrance (300m) / zoning / sunseekers / ferry / shipping lanes

RECREATION 

  • woodland walks / rare red squirrel / waterskiing / windsurfing / wding birds / wildfowl

WILDLIFE 

  • 18 SSI / richest natural habitat diversity in britain / Dorset wildlife trust / nature reserves 

POLLUTION 

  • AGRICULTURE POx NOx runoffs / URBAN DEVELOPMENT inc. surface run off / recreation
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HUNSTANTON, NORFOLK - cliff retreat

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