分凌运用对黄河宁蒙河段凌汛洪水控制作用研究OA

Due to its unique geographical location and climatic conditions,the Ningxia-Inner Mongolia Reach of the Yellow River is prone to ice jams and ice dams during freeze-up and break-up periods,leading to rapid rises in water levels that pose a serious threat to levee safety and socio-economic conditions along the river.In recent years,the scientific use of emergency flood diversion areas to detain ice floodwaters has effectively lowered river water levels,providing crucial support for preventing and mitigating ice flood disasters and ensuring ice flood control safety.Based on long-term ice flood control practices in the Ningxia-Inner Mongolia Reach,this paper systematically presents an approach centered on"ice flood diversion operation".From both macroscopic and microscopic perspectives,it analyzes long-term time series and typical years to comprehensively compare and analyze ice regime data from 1971 to 2024 before and after the implementation of diversion operations.Combined with a detailed analysis of the typical ice flood process in 2017-2018,the study examines the effectiveness of diversion operations on ice flood control in this reach.It demonstrates the critical role of emergency flood diversion areas in reducing peak ice flood discharge,enabling the controlled release of increased channel storage,and alleviating downstream flood pressure.The results indicate that after the use of emergency flood diversion areas,the average peak ice flood discharge in the Ningxia-Inner Mongolia Reach decreases by approximately 44％compared to the period without their use,showing significant flood control and disaster reduction benefits.Ice flood diversion is an effective engineering measure for addressing changes in channel conveyance capacity and achieving ice flood risk management,providing important theoretical and practical references for ice flood control in other rivers.