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| | Abstract | | The authors carried out a High Resolution Integrated Geophysical Investigation into a river levee which had experience of water leakage through its foundation. This study was part of a series of studies conducted since 2013, which have been aimed at the research and development of enhanced investigative and assessment methods for establishing the status of river levees and their relating structures. We performed the electrical resistivity tomography and surface-wave survey at 0.5m spacing along survey lines which were configured around the water leakage at the toe of the landside slope. The survey result revealed a high resistivity and low Vs zone in the vicinity of the leakage. Based on this result, it is likely that increased water level of the river due to rains had raised the water pressure on the sandy gravel layer distributed over shallower part of the foundation resulting in a leakage on the levee landside. This scenario was supported by CPT filed measurements which were carried out by PWRI. We believe therefore that the High Resolution Integrated Geophysical Investigation method has the potential to be a powerful nondestructive method for the detailed inspection of river levees. |
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