Transcript Tateson_SensorNwks_poster03

WIRELESS SENSOR NETWORKS TO MONITOR
SEDIMENT DYNAMICS
Dr JE Tateson, Dr C Roadknight, Prof IW Marshall at BT Exact,
with UEA, Essex University, UCL, Plextex and Intelisys.
A wind farm in Denmark, similar to the one that will
be on Scroby Sands.
This is a small
pressure sensor,
supplied by
Intelisys, that can
go down a 1 inch
bore hole.
This ‘coastal data
buoy’ is a large,
expensive package
to report data to land.
This is ‘the big picture’ of how sensor network technology
would be integrated into other areas of information
technology, to provide users with timely, relevant
information.
These are buoys,
similar to the ones
which will be
deployed around
Scroby Sands , to
maintain the radio
antennae above
water.
Superimposed on
this map of Scroby
Sands is a
simulated wireless
network with 5
network sinks.
This is a schematic to represent the way that the prototype
wireless sensor network will be deployed at Scroby Sands,
with some sensor packages on the sandbank, some partially
covered, and others under water, linked to buoys carrying
radio antennae.
For further details, see http://www.adastral.ucl.ac.uk/sensornets/secos
GLACIER DYNAMICS AND CLIMATE CHANGE AT
BRIKSDALSBREEN
Dr Jane K. Hart, Dr Kirk Martinez, Prof. Harvey Rutt,Dr Royan Ong, Dr Joe Stefanov, Daniel Miles, Sue Way
Departments of Geography and Electronics and Computer Science, University of Southampton;
Prof. I. Marshall & David Robinson BT, Nathan Boyd & John Argirakis Intellisys, UK; Dr A. Ford, University of
Utah.
Subglacial probe – 12cm long,
this will be put within and
beneath the glacier to measure
location, tilt, orientation and
pressure.
Hot water drill – this
is used to melt a
hole in the ice to
insert the subglacial
probes.
Communications – the
probes send their data
back to the surface, and
then to the reference
station by radio
communications. Live
data is then sent to the
internet.
Ground Penetrating
Radar – this can be used
to map out the depth of
the glacier.
Satellite image of
Jostedalsbreen – this will
be used with radar data
to calculate glacier
velocity over the ice cap.
Sedimentology – data from the
proglacial area of the flutes
(right) and push moraines
(below) show that there is
probably a wet sediment layer
beneath the glacier.
Live data can be seen at:
http://www.ecs.soton.ac.uk/~km/projs/probe
The aim of this project is to study glacier response to climate
change. Jostedalsbreen is one of the few locations in the
world where glaciers are currently advancing, because global
warming has led to increased precipitation. Briksdalsbreen
has advanced 600 m since 1955 with 390m of advance
between 1987 and 1996, during which time the glacier
advanced over its proglacial lake into a birch forest. Although
since 1996 the glacier has been slowly retreating, other
nearby glaciers are still advancing (e.g. Bødalsbreen,
Nigardsbreen and Bergsetbreen).
Glaciers are controlled by the amount of snow gained each
year, the amount of melting, the local topography and the
geology of the bed. When glaciers move over weak rocks,
they are able to flow faster. This glacier is flowing over
glacial lake materials which means there is probably a weak
water-saturated layer of glacial sediments (till) beneath the
till contributing to glacier motion.
This project aims to use the most advanced technological
methods to monitor and understand glacier dynamics. This is
the first time such a scheme has been attempted, and many
of the techniques are being tested for the first time. The
project will run during 2003-5 and link together the following:
•Understanding subglacial behaviour by insertion of
‘Subglacial Probes’ beneath the glacier by holes drilled in the
ice by a hot water drill
•Measuring ice thickness and bed rock geology with radar
(Ground Penetrating Radar)
•Measuring glacier movement by satellite radar (inSAR) and
differential GPS
•Developing an automated snow measuring instrument
•Collecting and linking the data via a wireless sensor web
(GLACSWEB) and sending the data back to UK where it is
displayed on the internet.
Snow
depth
meter
Base station
Reference
station
Ice
Sediment
w
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