74
ERDC/CRREL TR-02-14
1.8
TDR 1
1.6
TDR 2
1.4
TDR 4
TDR 7
1.2
Breakup
1
0.8
0.6
0.4
0.2
0
Date
Figure 50. Bed elevations from the TDRs using the 1503.
April 1999
Jan 1999
Propagation time
Figure 51. Bed level changes at TDR 1 using the 1502.
ice cover broke up; the same signal trends are evident on waterfall plots from
both the 1502 and 1503 for all the other TDRs.
It is possible that some of the probes failed, despite the care taken in placing
them. The coax cables could have developed leaks, which would have increased
the apparent pulse propagation time, making the coax cable appear electrically
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