Application of Water Temperatures to the Problem of Lateral Mixing in the Great Bear–Mackenzie River System

• Published in: Canadian Journal of Earth Sciences
• Main Author: Mackay, J. Ross
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1972
• Subjects: General Earth and Planetary Sciences; Mackenzie River; Mackenzie Delta; Great Bear River; Mackenzie river
• Online Access: http://dx.doi.org/10.1139/e72-073; http://www.nrcresearchpress.com/doi/pdf/10.1139/e72-073

Cross-river temperature profiles were run in mid-June 1971 at approximately 20 km intervals from the confluence of the Great Bear and Mackenzie Rivers, at Fort Norman, N.W.T., to the Mackenzie Delta, a distance of 650 km. As the Great Bear River was cold, the Mackenzie River warm, and as temperatures were read to better than ±.01 °C in the field, the cross-profiles have provided a record of the lateral mixing of the two rivers. A flow distance of 500 km was required for nearly complete mixing. The 1971 cross-river temperature profiles and aerial infrared imagery taken in 1969 show a good agreement in the mixing pattern. It is suggested that where water temperature contrasts exist, temperatures, which can be read easily with a resolution of better than ±.01 °C, may serve as one of the easiest and most economical of the tracers suitable for mixing studies.