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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
第75号 >
積雪底面融解量の場所による変化と流域平均量
| Title: | 積雪底面融解量の場所による変化と流域平均量 |
| Other Titles: | Spatial Variation and Watershed Average of Snowpack Bottom Melting Rate |
| Authors: | 石井, 吉之1 Browse this author | | 佐藤, 大輔2 Browse this author |
| Authors(alt): | Ishii, Yoshiyuki1 | | Sato, Daisuke2 |
| Issue Date: | 19-Mar-2012 |
| Publisher: | 北海道大学大学院理学研究院自然史科学部門（地球物理学） |
| Journal Title: | 北海道大学地球物理学研究報告 |
| Journal Title(alt): | Geophysical bulletin of Hokkaido University |
| Volume: | 75 |
| Start Page: | 59 |
| End Page: | 71 |
| Abstract: | In regions covered with a thick layer of snow, snow melting occurs at the snow-ground interface during the winter, a process we call snowpack bottom melting (SBM). To examine the spatial variation of the SBM rate and to estimate its watershed average value, field observations were made in a nival mountainous watershed in northern Hokkaido, Japan. Three different methods were adopted to determine the SBM rate, namely, heat flow calculation, snow lysimeter, and snow pit-wall observation methods, and we found the heat flow calculation method to be the most reliable among the three methods. SBM rates were measured using the heat flow calculation method at 7 sites in the watershed, where each site was selected by considering the slope or flatness, whether it was south- or north-facing, the vegetation, and the elevation. The SBM rate on the south-facing slope was larger than that on north-facing slope, and it was smallest in the forested site. Spatial differences in the SBR rate did not depend on the snowpack condition, but on the ground condition, especially on the gradient of soil temperature near the ground surface. Winter streamflow recession analysis taking into account a steady SBM input showed that 20 % to 30 % of SBM was supplied to the groundwater reservoir and contributed to winter streamflow. |
| Type: | bulletin (article) |
| URI: | http://hdl.handle.net/2115/49058 |
| Appears in Collections: | 北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第75号
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