Author(s): Makoto Yamazaki; Ken-Ichi Hirayama; Shigeki Sakai; Makoto Sasamoto; Masamichi Kiyohara; Hiroki Takiguchi
Linked Author(s):
Keywords: No Keywords
Abstract: Field measurements of anchor ice are conducted for 2 year. ! in a small stream in Hokkaido. Conclusions from the measurements are as follows: (1) Formation of anchor ice requires the flowing fraziI crystals. (2) Direction of anchor ice growth depends on the flow pattern around a boulder. (2) Density of the anchor ice masses is from Q. 3 to 0.7, and is propotional to the flow velocity. (3) A relation between daily production of anchor ice in volume and 6- hr freezing index is obtained. (4) Formation of anchor ice is strongly dependent on flow velocity. When the flow velocity is less than 0.7 ~ 0.9 m/sec, anchor ice was hardly observed. The critical velocity for the formation becomes slightly smaller when the 6- hr freezing index increases.
Year: 1996