Author(s): Yasuhiro Yoshikawa; Yasuharu Watanabe; Hiroyasu Yasuda; Yasuyuki Hirai
Linked Author(s): Yasuharu Watanabe
Keywords: No Keywords
Abstract: To obtain knowledge on the breakup phenomenon for use in the management of frozen rivers, non-contact continuous measurement of ice sheet thickness was conducted to examine the weather/hydraulic conditions that lead to breakup. From field observations and numerical calculation, the process of the breakup phenomenon at the Maruyama Observatory of the Teshio River in the Japan was presumed to be as follows: The flow rate increased as snow changed to rain with increased temperatures, thus causing the occurrence of breakup in the upper reaches. The flow rate increased as river ice and water flowed down to the Maruyama Observatory, and the flow velocity under the ice sheets became higher. Subsequently, as the melting of the ice bottom accelerated with the increased flow velocity under the ice sheets, the sheet thickness and strength decreased as a result of the higher water level and led to the occurrence of breakup.
Year: 2009