Author(s): Hiroshi Yokoyama; Yasuhiro Yoshikawa; Yu Inami; Hiroki Yabe
Linked Author(s): Hiroshi Yokoyama
Keywords:
Abstract: Ice jam flood is one of the problems for disaster prevention and maintenance of ice covered rivers in Hokkaido, cold snowy region in Japan. This study aimed to clarify the phenomena of ice melting process and to examine method to predict occurrence time of ice jam in ice covered river in spring thaw. First, we conducted continuous observation of ice melting process by measurement of inside the ice, river water, and longitudinal water level and capturing of river ice images with time-lapse camera. It was difficult to predict de-icing time only by visible information such as image of river ice. It was needed to consider more some invisible information such as continuous observation data of ice temperature, longitudinal water level to understand ice melting process and to predicted de-icing time. Next, we applied a simplified simulation model of time series change of river ice thickness. We assumed that possibility of ice jam occurrence increased when sudden decrease of river ice thickness appeared in the simulation. We compared actual ice jam occurrence time and sudden decrease of river ice thickness in simulations and discussed the applicability of the model for ice jam prediction.
Year: 2020