Abstract：In order to analyze the application of ground penetrating radar(GPR) in coastal riprap embankment，the model experiment is conducted. The experiment is carried out under different depths of saltwater. Then，through comparing the measured results with those obtained by numerical FDTD analysis for verification，the target reflection interface can be distinguished in waveform figure；the depth and shape image of riprap bottom boundary are investigated after calculating travel time difference and velocity. According to influence of saltwater on GPR signal，the experimental results indicate that the GPR is effective to identify the riprap bottom boundary of coastal embankment without saltwater. When model is submerged by seawater，the dielectric coefficient and electrical conductivity of media increase significantly. Moreover，the detecting error increases with the submergence depth and the interface image appears fuzzy. By using the linear characteristic of influence lines obtained from the forward simulation，the error of model experiment is corrected. Therefore，it can provide the basis for GPR application in coastal embankment.
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2011, Vol. 30 
