2016 Fiscal Year Final Research Report
Liquid water movement in a snowpack under the heavy rainfall event
| Project/Area Number |
26350482
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Natural disaster / Disaster prevention science
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 春の大雨 / 融雪洪水 / 積雪内浸透水 / 積雪水分移動モデル |
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| Outline of Final Research Achievements |
To replicate rain-on-snow events, artificial rain sprinkling experiments were performed on natural snowpack in Moshiri, northern Hokkaido, Japan. The results showed that a remarkable outflow from the snowpack bottom was observed in some cases of the experiments, and that there were no outflow in other cases. These differences could be caused by the existence of snow layer boundary with large contrast in grain size. To make sure of this hypothesis, a multi-dimensional water transport model developed by Snow and Ice Research Center was used for the reproduction simulations of the experiment results. Simulation results showed that the existence of snow layer was important to delay the liquid water percolation at the boundary. However, it was more important that whether the outflow from the snowpack bottom occurred or not was strongly dependent on the development of preferential pathways in the deeper snow layers.
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| Free Research Field |
雪氷水文学
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