An Observation of roll waves in a supraglacial meltwater channel, Harlech Gletscher, East Greenland

Steve Carver, Dave Sear, Eric Valentine
1994 Journal of Glaciology  
Observations of pulsating flow conditions in a supraglacier meltwater channel on Harlech Gletscher, East Greenland, are reported. Waves of water with turbulent wave fronts and smooth recessive limbs were observed passing downstream at regular intervals of 6-7 s. Peak channel discharge was estimated at 0.5-1.0 m3 s−1, in between which discharge was zero. It is suggested that the phenomenon as observed was due to the formation of roll waves in response to channel morphology and prevalent
more » ... prevalent discharge conditions. Measurements of channel morphology are given together with calculations of critical flow conditions, supporting the hypothesis of roll waves in a natural ice channel. A brief introduction to roll waves and the theory regarding their formation is included.
doi:10.3189/s0022143000003816 fatcat:une5ugczknhezmazuitbgamueq