氷板下における晶氷厚の連続測定

• Main Authors: 吉川, 泰弘, 渡邊, 康玄, 早川, 博, 清治, 真人
• Language: Japanese
• Published: 土木学会 2009
• Subjects: Ice-covered River; Frazil Thickness; ADCP; Teshio River; Hokkaido; Ice Sheet
• Online Access: https://kitami-it.repo.nii.ac.jp/record/7481/files/02syakai164watanabe.pdf; https://kitami-it.repo.nii.ac.jp/records/7481

The frazil thickness variation process that causes ice jamming has not yet been fully clarified, partly because observation itself is difficult. In this study the process of frazil thickness variation was clarified from the measured values of ADCP based on the results of field observation conducted on the Teshio River in Hokkaido. Of particular note in this study was the indication of the possible contribution of frazil-to-ice transition to the formation of ice sheets. A method of calculating ice thickness variation considering this transition was developed, and the validity of the calculated values was verified. Moreover the measurement data showed that the river thickness from the upper surface of ice sheets to the bottom of the frazil was almost fixed. application/pdf journal article