Friday 1 May 2015

Diurnal snowmelt pattern


The last 9 days of April show the typical diurnal snowmelt pattern where water levels rise and fall at a daily frequency due to fluctuations in the snowmelt energy balance between daytime and nighttime. The pattern is especially clear due to the fact that no precipitation at all fell during this time.

The moderate flood peak on April 20-21 was due to rainfall of up to 10 mm/h and an event total of nearly 60 mm (rain-on-snow event).

Stage = 58cm, Discharge = 2.84m3/s

Although levels of suspended sediment were very low, we could observe fine gravel-sized bedload moving on the streambed in the central part of the channel where depths were about 0.45m and velocities about 0.85m/s.

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