本文选取黄河宁蒙河段石嘴山、巴彦高勒、三湖河口和头道拐4个站点，分别统计分析了1951年-2000年和2001年-2010年流凌、封河、开河日期特征，并对凌峰和槽蓄增量进行了较系统地分析。结果表明，近10年来由于冬季气温持续偏高和水库调度等因素的影响，黄河宁蒙河段凌情发生变化，表现为封/开河日期推迟、封河历时缩短、开河凌峰流量减小、槽蓄水量增加、冰塞/冰坝发生次数减少等特点。研究成果可为黄河宁蒙河段防凌减灾等实际工作提供参考。

In this paper, the characteristics of drift ice, freeze-up, and break-up dates were analyzed at the following four stations - Shizuishan, Bayangaole, Sanhuhekou, and Toudaoguai stations, in the Ningxia-Inner Mongolia reach of the Yellow River, and the ice peak and maximum channel-storage increment were also investigated. The results showed that the ice regime characteristics in the Ningxia-Inner Mongolia reach of the Yellow River have changed significantly in the recent 10 years due to the sustaining high temperature in the winter and reservoir control, which can be seen in the delayed freeze-up and break-up dates, decreasing in freeze-up duration, decreasing in ice peak flow, increasing in channel storage, and decreasing in the frequencies of ice dam and ice jam. The research can offer guidance on the mitigation of ice disasters in the Ningxia-Inner Mongolia reach of the Yellow River.

国家自然科学基金项目（51379078和51009065）