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中文摘要：
防凌期河道流量演进受复杂凌情影响，研究成果少．在分析防凌期流量演进特点的基础上，考虑封开河日期、槽蓄水增量、气温等凌情影响因子，提出了分期分河段的混合算法以改进传统演进方法．以宁蒙河段为例，考虑流量传播时间，分为稳定封冻河段、不稳定封冻河段，分畅流期、封河期、封冻期、开河期，采用混合演进算法对宁蒙河段各断面的流量进行计算．结果显示，采用分期分河段的混合算法演进流量的精度大大提高，验证了混合算法的合理性、可靠性．
英文摘要：
Affected by the complexity of the ice condition, there is less research achievement of discharge routing in ice prevent period. In this paper, based on analyzing the feature of discharge routing, the divided period and reach hybrid algorithm is proposed to improve the traditional method by considering impact factors of ice condition, such as the date of freeze-up and break-up, channel-storage incre- ment, air temperature. Taking the Ningxia-Inncr Mongolia reach as an example, the whole reach is divided into stable frozen reach and unstable frozen reach. Meanwhile, the ice prevent period is divided into flowing period, freeze-up period, freezing period and break-up period. Then the flow of each section is calculated by the hybrid algorithm. The results show that the precision of discharge routing flow has greatly improved. The rationality and reliability of the hybrid algorithm are verified.
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