Estimation of Yukon River discharge during an ice jam near Dawson City

The paper presents two approaches used independently to estimate river disc harge during an ice jam on the Yukon River near Dawson City. One method ent ailed the use of large-scale particle image velocimetry to obtain surface v elocities, which were extrapolated and integrated to yield a discharge. Vid eotaping of ice-floe drift comprised the measurement method used for the la rge-scale particle image velocimetry. The second approach entailed numerica l simulations performed with a 1-D ice-jam profile model (ICEJAM). The nume rical model incorporates an "island-compensation" technique developed to ta ke into account the difficulty of using 1-D ice-jam profile models to simul ate accurately channels with two-dimensional features such as islands and b ars. The two approaches yielded closely comparable estimates of river disch arge.