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| Takiya River stage during winter 2016-2017 (good agreement between the two logger-sensor systems) |
The hydrograph above shows the period from late November to early April, and from this we can see that winter runoff was relatively high due to mild temperatures and a greater proportion of precipitation falling as rain as opposed to snow. This is what we expect in a warmer climate.
There is only a relatively short cold snowy period with decreasing stage from 10-29 January. There are multiple peaks from late November to early January as precipitation was mainly rain, and the period late January to February shows five peaks which are all connected to rainfall events. Snow survey shown in the figure below shows that seasonal snowpack did not accumulate at the basin mouth until 10 January, about 2-3 weeks later than average. Peak accumulations measured on 20 February were also well below average.
Today in very cold but dry conditions we measured the river discharge to check the stage-rating curve. For a stage of 49cm the discharge was 1.66m3/s, or about 6% above the stage-rating curve estimate. The depth and cross-section data showed that the greater than average winter flows may have caused some scour (deepening) of the streambed.
Photos: T. Kobayashi
