Author(s): Li Zhi-Jun; Jia Qing; Huang Wen-Feng; Lepparanta Matti
Linked Author(s): Zhijun Li
Keywords: No Keywords
Abstract: In order to understand the dominant factors for physical properties of ice in ice thermodynamics and mechanics, in-situ observations of ice growth and decay processes were performed in the Hongqipao Reservoir, Heilongjiang Province, China. During the observation season, three samples were taken: in rapid ice growth, in steady ice growth, and in ice thaw. These three ice samples were used to examine ice crystals and gas bubbles in ice and to measure ice density. The observations and measurements obtained contain the vertical profiles of the ice crystal type, ice crystal size, gas bubble shape, gas bubble size, gas bubble content, and ice density from ice surface to bottom. The findings of this study are: ice crystals in ice upper layer of ice sheet are granular, deeper ice crystals are columnar, the average crystal size increases with depth, and the ice sheet structure appears the same in the two ice growth stages. The shape of gas bubbles in upper layer of the ice sheet is mostly spherical and the gas content is higher, while the shape in the middle and lower layers is cylindrical with lower gas content when the ice growing. The size and relative volume of gas bubbles are active during the freezing and melting stages; ice density decreases with the increasing gas content.
Year: 2010