Author(s): Sujuan Ke; Zhanting Chen
Linked Author(s):
Keywords: No Keywords
Abstract: Since 1960, large reservoirs such as Sanmenxia, Yanguoxia, Liujiaxia, Qingtongxia, and Longyangxia have been constructed in the master stem of the Yellow River. Among them, Sanmenxia and Liujiaxia reservoirs have been operated for ice-flood prevention. Owing to reservoir regulation, water runoff and water temperature conditions have changed, so does the ice regime. In the upper reach of the Yellow River, Lanzhou river segment freezes usually. After Yanguoxia and Liujiaxia reservoirs were build, the situation changed. Unfrozen location could reach to the tail region of Qingtongxia reservoir. Freezing discharge varies largely. Ice jam occurs more frequently. Since freezing flow rate increases, discharging capacity under the ice cover has increased too. The later is favorable to ice flood control at ice break time. In the lower reach of the Yellow River, freezing discharge has increased, freezing distance and ice volume have reduced owing to the regulation of Sanmenxia reservoir since 1960 especially after its remodel in 1973. Thns the chance of forming ice-dam has decreased. The situation of ice flood has improved significantly. However, the problem of ice flood has not been solved completely yet. This paper, based on large amount of field data, analyzes the change of ice regime in the Yellow River. The laws of ice flood formation are studied and then the future development of ice flood in the YelIow River is predicted. Finally, comments are given for resolving the ice flood hazard in the Yellow River.
Year: 1996