Mactaquac Headpond - Longitudinal Section
 June 25th 2014

On June the 25th, 2014, the barge undertook a transect from the Mactaquac Marina to Woodstock. Over the 6 hours and 40 minutes of the transit, 303 MVP profiles were obtained. The following images briefly show the main structure observed.

Plan View showing drop locations w.r.t. headpond geography.
plan view
W-E Projected thermal structure showing the apparent relationship of the surface thermal anomalies to inflow from the side streams at Nackawic and Meductic.


As well as the MVP profiling, the Knudsen 200 kHz and Kongsberg Mesotech M3 multibeam 500 kHz was run to look at mid-water acoustic volume scattering. As can be seen, a pronounced scattering layer is present below 18 metres. And in the surface water, an apparent higher scatter plume is seen starting just upstream of Nackawic. Curiously, it starts upstream of the thermal anomaly at Nackawic itself (could that be the thermal signature of the pulp mill)? The upstream limit of the surface scattering anomaly actually corresponds to a surface cold water signature. Could this be enhanced mixing due to turbulence in the narrows?

The three sections below are co-registered time sections of the acoustic signature and the thermal signature.
200 kHz scattering
200 kHz
500 kHz scattering
500 kHz
Thermal Structure
Temperature
2014 MVP DIPS Download
Mactaquac Headpond - Longitudinal Section
 July 30th 2015

On July the 30th, 2015, the barge undertook a transect from Woodstock to the Mactaquac Marina. Over the 8 hours and 7 minutes of the transit, 303 MVP profiles were obtained. The following images briefly show the main structure observed.

Plan View showing drop locations w.r.t. headpond geography.
plan view
W-E Projected thermal structure showing the apparent relationship of the surface thermal anomalies to inflow from the side streams at Nackawic and Meductic.


As well as the MVP profiling, the Kongsberg Mesotech M3 multibeam 500 kHz was run to look at mid-water acoustic volume scattering. As can be seen, a pronounced scattering layer is present below 18 metres. And in the surface water, an apparent higher scatter plume is seen starting near Bear Island.

The two sections below are co-registered time sections of the acoustic signature and the thermal signature. NOTE: The Knudsen 200kHz singlebeam was logged, however there was no scattering observed in the processed data.
500 kHz scattering
500 kHz
Thermal Structure
Temperature
2015 MVP DIPS Download

page creates by JEHC, Sept. 2014 -- modified J.Muggah August 2015