Lac Saint Pierre, Quebec

CLIENT: Canadian Department of National Defense

STA RESULTS: Transport pathways and their dynamic behaviour revealed

  • STA discovered a highly complex transport pattern not easily explained with a 2-D river model.
  • The Saint Lawrence River is not a significant source of the sediments — no contaminants from elsewhere.
  • Sediments and trace metals are derived from underlying “ancient clay” located at “parting zones”. Gas contained in the sediments and diapiric processes are possible mechanisms to bring the ancient clay to the surface of the lake bottom.
  • Almost the entire lake bottom is under erosion resulting in the natural and rapid removal of contaminants.