Dense DAS investigation of a dam seepage anomaly
A completed field trial in southern China evaluated whether surface-wave imaging could identify mechanically weakened zones associated with observed seepage.
● Field trial completed · method validatedMonitoring question
Can dense vibration sensing reveal the spatial pathway and mechanical signature of seepage inside an embankment?
Field method
Three fiber survey lines at the crest, mid-slope and toe; ten hours of ambient noise; 500 Hz acquisition, 4 m gauge length and 0.4 m channel spacing.
Analysis
Ambient-noise cross-correlation, frequency–Bessel dispersion imaging and a zero-offset profile provided independent views of wave-speed change.
Finding
A continuous shallow low-velocity zone aligned closely with the field-observed seepage location, supporting the interpretation of a weakened seepage pathway.
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