According to experts in Harbin hydrology, since the completion of Dadingzishan Navigation and Power Hub, the Harbin section has been "Wenkaijiang" every year.
Regarding the formation principles of Wenkaijiang and Wukaijiang, Song Lianbin, captain of Harbin Hydrological Survey Team, said: "Wenkaijiang or Wukaijiang is mainly influenced by the upstream river dynamics. If the river speed is relatively stable and the water level changes little, it is relatively easy to open the river. If the upstream velocity is high and the water level rises obviously, the already thinned and cracked ice surface will burst. A large number of broken ice will collide with each other downstream, and Wukai River will appear. "