Dam deformation surveys with modern technology

Atkinson, Jack Allan (2014) Dam deformation surveys with modern technology. [USQ Project]

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Abstract

Dam deformation surveys are repetitive surveys that must be undertaken periodically on
high risk structures such as large earthfill dams. This dissertation is to examine and test the
ability of the Leica Nova MS50 terrestrial laser scanner (TLS) and utilise these findings to
develop a dam deformation survey procedure that can be amplified by the inclusion of TLS.
The Leica Nova MS50 is an instrument that has only recently come onto the market. It
provides the latest technology by combining a high precision total station technology with
the capability of capturing highly accurate scanned data.
The existing dam deformation survey methods require manually placing survey targets on
predefined stations located across the surveyed surface, placing the surveyor in danger
from slips, trips and falls on often steep and unstable ground. There is an identified need
for an automated remote process to be developed, providing safety for the surveyor whilst
not compromising the survey accuracy.
It will be possible to determine the accuracy of the Leica Nova MS50 and its suitability to be
utilised in dam deformation surveys by developing three separate testing scenarios:
 Angle of incidence test – determining the effect the angle of incidence has on a
distance read;
 Difference in length detection – examine the accuracy of the instrument and
determine the difference in length measurement capabilities at nominal lengths; and
 Laser Dot Size – to examine the size of the measuring laser at nominal lengths.
This dissertation found the Leica Nova MS-50 to be a very accurate and capable machine. It
was determined from the testing conducted that scanning at 1000 hertz for deformation
scanning had to be limited to distances less than 100 metres (m). It was also verified that
survey control pillars would need to be constructed in the most suitable location; ensuring
scanning procedures are conducted from the same location for each epoch.
This dissertation also found, the rabble rock surface that earthfill dam walls are covered by,
creates exaggerated error when scanning due to the uneven surface. Therefore it was
determined this survey method may be best suited to concrete structures are surfaces that
are flat.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science (Surveying) project.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Campbell, Glenn
Date Deposited: 19 Aug 2015 04:50
Last Modified: 19 Aug 2015 04:50
Uncontrolled Keywords: scanner, dam, deformation
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
URI: http://eprints.usq.edu.au/id/eprint/27325

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