Because of long time of low temperature and snowing, and the ice accumulation in Tongguan reach and little north stem of the Yellow River, the dammed water extended upstream step by step.

• 长时间的低温风雪天气，以及大风降温初期在黄河小北干流和潼关河段所形成的冰凌堆积，又直接导致冰塞壅水节节上延。