3.5 kHz subbottom
across Shippagan dredged channel
|
In the vicinity of the dredged
channel NW of Shippagan harbour (Pointe Brule), however, it is
also clear from the subbottom profiling (image to left) that the
dredging has extended down into this gas rich horizon. However, if one
looks at the sidescan image of the same dredged channel (image to
right), one can clearly see that the channel floor is distinctly low
backscatter (as would be expected if it is actively being filled in by
fine grained sediment deposited through current action).
Thus, by comparison to the analogous situation in the Shippagan dredged
channel, exposure of the gas rich horizon would not be expected to
produce a positive backscatter anomaly as is seen in the Lameque Bay
dredged channel. In fact if we look at the sidescan image of the outer
part of the Lameque channel, it is also low backscatter. |
200 kHz sidescan
across Shippagan dredged
channel
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