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To facilitate this process, the TE2100 team
developed FloodRanger Professional, building on the original
FloodRanger tool developed as part of the UK Government´s
Foresight Flood Project. This seeks to incorporate an open
architecture such that flood risk modelling carried out in
other modelling environments (e.g., hydrodynamic inundation
modelling, MDSF evaluation of economic and social impacts)
can be incorporated into the ‘FloodRanger Professional’ tool,
thus enabling the rapid visualisation and exploration of
flood risk to a wider stakeholder community.
For this piloting application, a FloodRanger Professional
project file has been created based on the TUFLOW hydrodynamic
inundation modelling and MDSF economic damage calculation
described earlier in this section.
The FloodRanger Professional project enables visualisation
and exploration of the flood risk associated with the
first three of the previously identified strategy options
(Do
Nothing, Maintenance Only and Do Something A), for a
single climate
change scenario that predicts the largest increase in
estuarial water levels at 2000, 2050 and 2100 (High +).
The current
(year 2000) socio-economic ‘world future’ was
used.
The first stage of the process used to create the FloodRanger
Professional project involves estimating Southend water
levels for a range of event return periods, and mapping
these estimates
to the set of explicit TUFLOW / MDSF results. A second
stage of this process involved ‘masking’ certain areas
of the flood risk maps to account for the flood protection
offered by the flood management assets, the defences and
the Thames barrier(s).
An ArcView 3.x extension was developed to assist in
creating FloodRanger Professional datasets. A DTM,
flood frequency
grids, event damage grids, event population affected
grids and additional overlays can be created from
this extension.
Details of the processes involved in the creation
of FloodRanger Professional project and associated datasets
is given in
the Technical Annex.
FloodRanger Professional has two modes of interaction:
• ‘constant scenario’ allows the user to select
a particular world future scenario and climate change scenario
and to run through a series of time-slices, electing different
flood management options and experiencing different randomly
generated flood events to better understand how flood risk
evolves under given futures
• ‘scenario picker’ allows the user to select all
variables – a particular world future scenario, climate
change scenario, flood management option, flood of specified
severity and time in the future – to visualise flood
extent and the associated area flooded, population flooded
and economic damage.
Figure 1 shows the FloodRanger Profesional
map of flood extent of the Thames estuary
(viewed from Teddington towards Southend) for a 1:1,000
year flood under current climate conditions
under a ‘do nothing’ scenario.
Defences have deteriorated to ground levels
and the Thames barriers are not operated.
Figure 2 shows the associated tabular result
summary.
Figure 1: FoodRanger Professional
estuary-wide view
 Figure 2: FloodRanger Professional
estuary-wide tabular summary
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