Main features and advantages of the AquaScan
technology are as follows:
-
Combines radar and sonar
measurements in single survey
-
Fast and accurate
measurement of water depth in lakes and inland waterways
-
Sediment thickness surveys
for lakes and rivers for contaminated sediment volume calculations
-
3-D model; Digital results
in (x,y,z) coordinates
- Locate obstacles (buried cables, trash) on
lake and river bottom
- Underwater Archaeological Survey(-s)
AquaScan Water Depth and
(Contaminated) Sediment Layer Surveys
The AquaScan survey is performed by running simultaneous Radar and Sonar
surveys along random survey lines. Use of Sonar is optional depending on
project requirements. The measurements are related to the local
coordinates and a reference elevation level. Measurement data are processed
and interpreted into a 3-D model representing depth and thickness of the
sediment layer. This model can be used for identification of
(contaminated) sediment, water management, planning of dredging projects
pre-dredging and post-dredging surveys. By applying quantitative
calculations on the basis of the measured profiles and desired river or lake
bottom profiles, volumetric calculations can be performed.
The radar survey will also identify foreign objects or trash that are
present at the bottom. Identification and location of large buried obstacles
may be important factor in selection of the preferred dredging method and to
prevent 'surprises'. Various locations can be measured rapidly and
effectively, and a large diversity of data delivery and reporting is
available.
Underwater Archaeological
Investigation
The high resolution of AquaScan survey allows for identification of
subsurface structures of interest buried in the sediment.
It is now understood that most early human settlements were near the
shore of rivers and lakes. As a result of changes in water level or soil
subsidence, the remnants of such early settlements may currently be located
under water.
Locating of underwater Cables, Pipes
and Objects
The radar (or magnetometer/EM61) can also be used to locate objects, such
as cables, pipes, underwater mains, drums, refrigerators etc.. The objects
can be located on the river or lake bottom as well as below the silt.
Objects can be marked in the field or, identified with position and depth on
a map.
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