Feasibility of Mapping Water Tables - Abstract
Feasibility of Mapping Water Tables - Abstract
Abstract
East
Flanders Moss, in the Stirling District of Central Region in Scotland,
is part of a series of raised mires. The area is widely recognised as a
site of international importance providing habitats for a wide range of
flora and fauna. Critical to the conservation of this valuable habitat
is the maintenance of the water table close to the surface. Due to activities
such as (1) agricultural improvement, (2) grazing (3) afforestation, (4)
commercial peat extraction, (5) drainage and (6) burning the moss surface
is 'drying out'. To assess the rate at which is occurring and the implications
the activities have for the water table, there is a need to develop a remote
method of mapping wetland water tables. The wetland water table depths
are most readily measured using spectral wavelengths that encompass the
thermal infra-red. The use of airborne imagery, such as the Daedalus 1268
sensor, give the adequate spatial resolution necessary (2-5 metres) in
order to quantify the depth to the water table. However, it must be pointed
out that vegetation cover with differing transpiration rate, topography
and other environmental factors confuse interpretation.
A
correlation of 0.65755 was achieved between ATM data and 1995 field data,
thus demonstrating the possibility of using remotely sensed data for mapping
the depth to wetland water tables and wetland surface features.