中文摘要：

冰凌是北方河流冬春季常见的现象，由于环境因素的变化，河道冰情也在不断的变化，甚至在一些地区出现凌汛灾害．根据冰塞形成发展的机理，利用水力学模型和热力学模型模拟研究了无定河流域下游段丁家沟至自家川的每年春季河流水位、封河日期和开河日期．模拟结果较为理想，并分析了形成凌汛的原因，旨在给该区域水循环研究、水资源的开发利用、水土保持等工作提供有力的科学技术支持．

英文摘要：

In North China, rivers are always covered by thin ice in winter. River ice evolution is controlled by many factors, including motivating factors, thermal factors and the river characteristics. In some places, it has brought people into flood danger. So, it is very necessary to study the river ice evolution. Based on ice jam mechanism, hydraulics model and energetics model are intro-duced into this research and well simulate water level, freeze-up and break-up date of each spring in Wudinghe River. Additionally, It is also explained how the river ice flood develops. This research is designed to provide a meaningful support to the studies of water cycle, water resources development and utilization, soil and water conservation in the Wudinghe basin.