GPR for river dyke - GSB

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In the radargram shown in Figure 9, two sets of anomaly are found. One is between the trace number 355 to 380 and the other is in between 320 to 340. The anomaly in the red circle represents the sluice gate. The lines representing the reflections from the ground layers suddenly end from both side of red circle indicating the existence of the sluice gate. The anomaly in between traces 320 to 350 shows a different reflection pattern from the other one. This discontinuity of signal may be due to the beginning part of the sluice gate structure. 4.2.2 GPR survey on Rostampur area Figure 10: GPR test layout at Rostampur area A GPR Survey was performed in Rostampur Cross dyke (23º52′32″ N, 90º21′01″ E) to identify subsurface lithology (Fig 11) and the test result is shown in Figure 10. In this survey the 1.2m antenna has been used. Between the traces #1 and #110, three lithological layers can easily be identified from the radargram. The uppermost unit is mainly composed of brick chips and silty clay materials with a thickness 0.5m. Below the top layer there is another layer of thickness 0.5m. The lithology of this layer has not been identified. Below the second layer the main dam materials silty clay to clay are found. From trace #111 to the end of the radargram, we can only see two layers. Figure 11: Test result in Rostampur area.
4.2.3 GPR survey on Prottasha bridge and on highway nearby Figure 12 shows the GPR survey at Prottasha Bridge (23º54′21″ N, 90º22′35″ E) using the 1.2 m antenna used in all of the outdoor tests. Figure 12: GPR team in action (test on Prottasha Bridge) Figure 13: Radargram along connecting road of Prottasha bridge.
Page 1 and 2: GOVERNMENT OF THE PEOPLE’S REPUBL
Page 3 and 4: Summary The Norwegian Geotechnical
Page 5 and 6: 1 Introduction The Geological Surve
Page 7 and 8: Figure 2: GSB personnel operating t
Page 9 and 10: Figure 5: Radargram for the test on
Page 11: new pitch road has been made. The t
Page 15 and 16: Figure 15 shows the radargram for G
Page 17 and 18: In Figure 20, there is no continuou
Page 19 and 20: Kontroll- og referanseside/ Review
Page 21: Kontroll- og referanseside/ Review

GPR for river dyke - GSB

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