Author(s): Kento Watanabe; Yasuhiro Yoshikawa
Linked Author(s): yasuhiro yoshikawa
Keywords: Ice jam; Experiment; Air temperature; Discharge; Real ice
Abstract: This study investigates the impact of air temperature on ice jam-induced water level rises in cold region rivers through hydraulic experiments. Utilizing a 12 m long, 0.6 m wide flume with a 0° slope and a 0.1 m wide constriction to simulate ice jams, ice blocks of 0.15 m × 0.15 m × 0.02 m were introduced under varying conditions of discharge (0.001 m3/s, 0.002 m3/s, 0.003 m3/s) and air temperature (1°C, 15°C), with each scenario repeated twice. Observations included water depth and temperature, air temperature, and visual documentation. Results indicated that higher discharges increase water levels but also expedite ice flow, potentially preventing significant water level rises. Ice jam duration was notably longer at lower temperatures, increasing by 27% at 0.001 m3/s, 38% at 0.002 m3/s, and 11% at 0.003 m3/s. Maximum water levels occurred when ice blocks overlapped, especially when arranged at an angle, suggesting the arrangement's influence on water level elevations. This research highlights the complex interplay between temperature, discharge, and ice block orientation in influencing ice jam dynamics and water level variations.
Year: 2024