Page 452 - NGTU_paper_withoutVideo

Modern Geomatics Technologies and Applications

Figure 3:Displacement of points on dam crest : points S01, S11 and S21 from left fulcrum and also
points S31, S41and S51 from right fulcrum have moved toward center of dam.

Figure 4: Position of points on dam crest and their movement directions: the points have moved toward
the center of dam

2.2. Geotechnical methods:

Geodetic methods and aerial photogrammetric systems cannot provide all the

requirements of the monitoring measurements. Specific measurement
techniques should be utilized to assess the displacement in foundation of large

engineering structures such as dams and also, to ascertain the relative motion
of different layers of soil or even to rock's slope stability studies. In comparison

with conventional surveying methods, the geotechnical instruments are

invaluable to achieve continuous measurements of interior parts of structure.