Flow JD126:
6th May
Peak ~ 0.4m/s
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Flow JD131:
11th May
Peak ~ 0.4m/s
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Flow JD144:
24th May
Peak ~ 0.4m/s
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Flow JD147:
27th May
Peak ~ 0.4m/s
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Flow JD148:
28th May
Peak ~ 0.2m/s
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The next three flows (JD150 -
A, B C) all occurred within the
same low water period within ~ 1.5 hours.
(followed by another very weak one 3.5 hours after the
first) |
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Flow JD150A:
30th May
Peak - 3.5m/s
The first major one of the year
- 2048 - first of day...
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Flow JD150B:
30th May
Peak ~ 0.6m/s
- 2135 - (47 minutes later)
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Flow JD150C:
30th May
Peak ~ 0.4m/s
- 2213 - (38 minutes later)
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this weak one is actually late on
the same LLW.
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Flow JD151:
31st May
Peak ~ 0.25m/s
- 0030 - (2 hours 15 minutes later)
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Flow JD152:
1st June
extremely weak, but clearly the remnant of an event.
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Flow JD153:
2nd June
Peak ~ 1.8m/s
- 2235
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Flow JD156:
5th June
Peak ~ 0.7m/s
neither a river surge (actually a drop) nor a spring LW.
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The next two flows (JD158 A
and B) occurred within the same
low water period within a half hour.
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Flow JD158A:
7th June
Peak ~ >2.0 m/s
- 1650 - first of day...
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Flow JD158B:
7th June
Peak ~ > 4.0m/s
the fastest so far. ~ 8 knots!
Note that the suspended sediment concentration becomes so
high that the ADCP backscatter is attenuated in the lower
part of the flow.
- 1718 - (28 minutes later)
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and two more slow suspended
sediment pulses at:
- possibly distal remnants of flow from the north or
central channels?
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The next three flow (JD159 A,
B and C) all occurred within the same
low water period within 1.5 hours.
As can be seen, the range to the seabed is moving up and
down which
implies that either the ADCP mooring is not stationary or
the
seabed is changing underneath the ADCP.
In this case we were able to exactly locate the ADCP as
we could see it in the 710 water column when we steamed by
for the third flow. The ADCP is actually suspended
over a bedform
on the channel floor. Before the third flow, it was upstream
of the crest,
and after the flow the bedform had migrated upstream
and thus
the apparent seafloor dropped into the trough.
Superimposed on this though is the possibility that the ADCP
on its
~155m long tether is swinging gently when disturbed by a
passing flow.
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Flow JD159A:
8th June
Peak ~ 1.5m/s
- 1711 - first of day...
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Flow JD159B:
8th June
Peak ~ 1.5m/s
- 1813 (one hour later)
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Flow JD159C:
8th June
Peak ~ 2.0m/s
- 1838 (25 minutes later)
This is the one that we chased down channel with the Heron.
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On June the 8th at 2032 (well after the low water) the ADCP
was lifted and the data downloaded and the battery replaced.
It was subsequently redeployed on the early morning of the
9th of June, well before the following lower low water.
There was no overnight bathymetric change.Thus no missing
flow are suspected.
Based on daily bathymetric surveys for the next 5 days,
there were no further flow events.
We have yet to recover the ADCP for the June 9th to July
11th period to see the subsequent activity.
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Subsequent Flows yet to be processed...
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