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Eroded Western Bank
The following pair of images illustrates the 8 year downstream
and lateral migration of the lower meander and associated
pointbar.
Comparison of 2011 v. 2019 western (top)
channel flank against salt marsh
Illustrating Outer bank erosion and
Point Bar migration
2011 - used 2009 air photo
2019 - uses 2016 air photo
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animation contrasting the two
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2011 survey
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2019 survey
(note greater up-river penetration)
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Upstream Eroded Eastern Bank:
The following images show the morphology and
overlying estuarine structure along the eastern bank in April.
At that time the river hadn't started flowing so the salt
wedge is well established.
25cm grid (click for full res.) of the EM2040P bathymetry along
the eroding eastern bank.
The road on the top of the training dyke is just visible in the
lower right.
EM2040P water column imagery (300 kHz). (surface to
6m, transducer is at ~ 1.2m).
co-registered (along the X axis) with the bathymetric map above.
Nadir Section showing halocline and KH wave mixing (and
location of two submerged trees)
Submerged Tree Imaging:
As we'd reconnoitered the location of the recently collapsed
trees on the previous low tide, we were able to slowly approach
them at high water and imaged them as we passed over them.
panorama looking downstream (left) and upstream (right) along
the eroded eastern bank of the Squamish estuary. Low water
(+1.0m CD)
downstream tree - at low water
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upstream tree at low water
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animation showing nadir section (left) and pie sections
(right)
as we passed over the downstream tree (steaming
downstream)
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animation showing nadir section (left) and pie sections
(right)
as we passed over the upstream tree (steaming
downstream)
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