Dynamics of sediment-laden underflows passing over a subaqueous sill: glacier-fed Peyto Lake, Alberta, Canada
Article first published online: 14 JUN 2006
Volume 43, Issue 5, pages 865–875, October 1996
How to Cite
CHIKITA, K. A., SMITH, N. D., YONEMITSU, N. and PEREZ-ARLUCEA, M. (1996), Dynamics of sediment-laden underflows passing over a subaqueous sill: glacier-fed Peyto Lake, Alberta, Canada. Sedimentology, 43: 865–875. doi: 10.1111/j.1365-3091.1996.tb01507.x
- Issue published online: 14 JUN 2006
- Article first published online: 14 JUN 2006
- Manuscript received 3 March 1995; revision accepted 15 February 1996.
The dynamic behaviour of sediment-laden underflows was examined in Peyto Lake, Alberta, Canada, which contains a midlake sill 7 m high. Sediment-laden underflows are driven by the downslope component of negative buoyant gravity multiplied by the current's thickness. Our measurements of wind, lake currents and water properties indicate that underflows pass over the sill due to the active storage of turbid suspension near the bottom in the deepest proximal region. Sill overflows occurred only when a hydrological threshold of the inflowing river was exceeded, causing quasicontinuous underflow and associated sedimentation in the distal region of the lake basin.