SAFETY MONITORING OF SAEMANGEUM SEA DIKE USING GEOPHYSICAL METHODS

摘要

We applied geophysical methods to identify the anomalous region originated by the leakagethrough the dredged sand beneath the main road along the sea dike and developed theapplication techniques of non-destructive geophysical methods including electrical resistivity(ER), ground penetration radar (GPR), multichannel analysis of surface waves (MASW).Geophysical methods have been extended to a variety of sectors owing to the rapiddevelopment of measuring equipment and information technologies. These geophysicalmethods can provide useful information for effective investigation of sea dikes.The following three monitoring results applied for dike safety will be introduces:(1) ER method is very effective for leak detection in sea dike. Low resistivity region meansto high possibility of the leak in sea dike. This method was applied to confi rm stability of3, 4 sectors in Saemangeum sea dike. The whole dike was generally stable condition,but partial anomalous zones were suggested in special regions. Therefore, short periodicmonitoring is required to these anomalous zones. The automatic measurement systemis advantageous method for data acquisition of short period. If the large amount of datais acquired with this system, we expect to be able to detect subtle changes of sea dike infuture.