海勃湾水库的防凌作用及对凌情的影响

Ice-Flood Prevention Effect on Haibowan Reservoir and Its Impact on Ice Conditions

分析了海勃湾水库运用对黄河内蒙古河段的防凌作用及对凌情的影响。结果表明:海勃湾水库的运用使内蒙古河段流量适时调节能力增强,封河流量控制得更加精准,开河关键期进一步控制下泄流量,减少"武开河"风险;出库水温提高,海勃湾-巴彦高勒河段成为不稳定封冻河段,冰量减少,凌情减轻。受出库水温影响,内蒙古河段流凌和封河条件改变,同等动力及河道条件下,流凌封河要求的累积负气温更低,降温强度更强。分析成果可以为该河段冰情预报和黄河防凌决策提供参考。

The effect of Haibowan reservoir operation on ice-flood prevention and ice condition in Inner Mongolia reach of the Yellow River was analyzed.The results show that the operation of the Haibowan reservoir enhances the ability of timely regulation of the flow in Inner Mongolia,and the control of the freeze-up discharge is more precise.The flow is further controlled during the ice breakup period to reduce the risk of mechanical breakup.With the increase of the outflow water temperature,the Haibowan-Bayangaole reach becomes an unstable frozen river section with less ice and less ice disaster.Influenced by the water temperature of outflow reservoir,the conditions of the formation of ice runs and freeze-up in Inner Mongolia reach have changed.Under the same dynamic and river channel conditions,the accumulated negative temperature required during the formation of ice runs and freeze-up is lower and the cold air intensity is stronger.The analysis results can provide reference for ice condition prediction and ice-flood prevention of the Yellow River.