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The Department of Water Affairs in South Africa expands Dam Monitoring to GPS/GNSS Deformation Monitoring

GNSS Monitoring

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Page 1: GNSS Monitoring

The Department of Water Affairs in South Africa expands Dam Monitoring to GPS/GNSS Deformation Monitoring

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Trimble - NetR5 receiver - Zephyr Geodetic Antenna

DELL T310 Server Poynting WIFIRB411 panel Antenna

Sector 90 deg Antenna

Omni 360 deg Antenna VSAT Antenna SkyEdge Modem

GNSS BASIC EQUIPMENT

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BASIC GNSS SETUP CREST OF DAM WALL

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TYPICAL GNSS REFERENCE STATION

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Zephyr Geodetic Antenna3rd Arch Stompdrift dam

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Omni 360 deg AntennaRoode Els Berg dam

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GNSS Monitoring LayoutDuivenhoks Dam

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GNSS Monitoring LayoutStompdrift Dam

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GNSS Monitoring LayoutKouga Dam

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GNSS Monitoring LayoutRoode Els Berg Dam

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Some Key features of Trimble 4D ControlPost Processing Monitoring

• Computation and analysis of sensor displacement

• Axis Rotation – computation and display of displacements along a user defined

• Displacement charts and tables

• User defined tolerance settings Instant notification of deformations that exceed he pre-set tolerance values.

• Alarm Manager – Real time warnings and alerts via email Real time warnings and alerts via email

• Remote login to view and control the system

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Kouga dam - Left Flank Crest1 Hour Post Processing Graph

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Kouga dam - Right Flank Crest6 Hour Post Processing Graph

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GNSS Reference station coordinates derived from Geodetic Deformation results

Roode Els Berg Dam

Station Date Y X dy dx (m) (m) (m) (m)

P01 22/02/2012 205.2479 400.8471 P01 17/02/2013 205.2495 400.8486 +0.0016

+0.0015 Mean 205.2487 400.8478

P03 22/02/2012 -86.0861 252.9499 P03 17/02/2013 -86.0854 252.9516 +0.0007

+0.0017 Mean -86.0858 252.9508

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Computed local GNSS co-ordinates of secondary GNSS pillars on crest of dam

Roode Els Berg Dam

Station Date Y X (m) (m)

P203 22/02/2012 GNSS -38.9167 27.0547 22/02/2012 Geodetic -38.9169 27.0540 Diff -0.0002 -0.0007

P203 18/02/2013 GNSS -38.9176 27.0532 19/02/2013 Geodetic -38.9172 27.0545 Diff +0.0004 +0.0013

P206 22/02/2012 GNSS 36.0821 26.9494 22/02/2013 Geodetic 36.0819 26.9488 Diff -0.0002 -0.0006

P206 18/02/2013 GNSS 36.0811 26.9492 19/02/2013 Geodetic 36.0815 26.9499 Diff +0.0004 +0.0007

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GNSS vs GEODETIC Deformations at Roode Els Berg dam

Temperature and Water Level

Up/Downstream GNSS Deformations

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GNSS vs GEODETIC Deformations at Roode Els Berg dam

Temperature and Water Level

Left/Right Flank GNSS Deformations

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