SQ Summer 2017 - ADCP results

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CSL Heron Squamish Operations
April-October 2017

ADCP Results - first deployment

John E.Hughes Clarke, Anand Hiroji, Liam Cahill	Ian Church, Angela Gillis
Center for Coastal and Ocean Mapping University of New Hampshire, USA	Ocean Mapping Group University of New Brunswick, Canada

ADCP Results.

The UNB 600 kHz ADCP was

Flow 126: 6th May Peak ~ 0.3m/s
Flow 131: 11th May Peak ~ 0.3m/s
Flow 144: 24th May Peak ~ 0.2m/s
Flow 147: 27th May Peak ~ 0.25m/s
Flow 148: 28th May Peak ~ 0.1m/s
The next three flows (150 - 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)
Flow 150A: 30th May Peak - 2.2m/s ACTUALLY up to 3.5 m/s! The first major one of the year - 2048 - first of day...
Flow 150B: 30th May Peak ~ 0.6m/s - 2135 - (47 minutes later)
Flow 150C: 30th May Peak ~ 0.3m/s - 2213 - (38 minutes later)
this weak one is actually late on the same LLW.
Flow 151: 31st May

Flow 152: 1st June
Flow 152: 2nd June Peak ~ 1.3m/s ACTUALLY up to 1.8 m/s! - 2235
Flow 156: 5th June Peak ~ 0.7m/s neither a river surge (actually a drop) nor a spring LW.
The next two flows (JD158 A and B) occurred within the same low water period within a half hour.
Flow 158A: 7th June Peak ~ 1.3m/s ACTUALLY sustained at 1.8m/s peaking (if you believe it) to 3.0m/s - 1650 - first of day...
Flow 158B: 7th June Peak ~ 1.7m/s ACTUALLY sustained at 2.2m/s peaking (if you believe it) to 5.0m/s - 1718 - (28 minutes later)
and two more slow suspended sediment pulses at: 1910 and 1945 - possibly distal remnants of flow from the north or central channels?
The next three flow (159 A, B and C) all occurred within the same low water period within 1.5 hours. ??? something wrong with the top velocity plot ????
Flow 159A: 8th June Peak ~ 1.5m/s sustained is more like 1.0m/s - 1711 - first of day...
Flow 159B: 8th June Peak ~ 1.5m/s sustained is more like 1.0m/s - 1813 (one hour later)
Flow 159C: 8th June Peak ~ 0.8m/s ACTUALLY head is sustained at 1.7ms sitting for half an hour > 1.0m/s - 1838 (25 minutes later)
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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