Dawlish Warren
Flood Risk
Assessment
Mathew Jose
I have been allocated; the task of using GIS systems to develop a scenario
that represents the effects of the erosion of sand bank.
Mathew Jose
6/8/2010
CONTENTS
Background ....................................................................................................................................................................... 3
Scenario1....................................................................................................................................................................... 3
Scenario2....................................................................................................................................................................... 3
Implementation ................................................................................................................................................................ 3
Download Tab files........................................................................................................................................................ 3
Download contour lines ................................................................................................................................................ 4
Download raster images ............................................................................................................................................... 5
Create three layers........................................................................................................................................................ 5
Analysis ............................................................................................................................................................................. 8
Scenario 1...................................................................................................................................................................... 8
The sea level rise for 5 meters .................................................................................................................................. 8
Sea level rise for 10 Meters ...................................................................................................................................... 9
This is the sea level rise for 15 meters below ......................................................................................................... 10
Evaluation ................................................................................................................................................................... 12
Works Cited ..................................................................................................................................................................... 14
2|P a g e
BACKGROUND
Dawlish warren is a costal town protected by a sea wall of 5 meters in height and along this sea wall is a railway line.
There is also a sand bank in the middle of the estuary; this provides some protection the cost at the moment along
with the sea wall. Sea levels are set to rise between 2.4- 3.9mm a year but “SLR at 2100 somewhere in the 80 cm to 2
meters range, and suggest that 80 cm should be the ‘default’ value” (realclimate, 2008). Devonshire council would
like some sort of prediction as to what the area would look like if the sea level was to rise and how much land would
be lost. The council has stated that there is a current storm surge of 5 meters at present and to factor this in to the
final model.
SCENARIO1
If the sand bank was to disappear show a 5 meter surge in the high water mark. The council would like to know what
the coast line will look like if the