南水北调中线工程分水口敏感性研究

Study on the Turnout Sensitivity of the Middle Route of South-to-North Water Diversion Project

南水北调中线工程按闸前常水位方式运行,分水口(退水闸)流量变化会引起渠道水位的波动,工程正常运行要求渠道水位下降速率不超过0.15 m/h。为了满足这一要求,构建南水北调中线工程一维水力学模型,分析分水口(退水闸)流量变化引起的渠池下节制闸闸前水位的变化过程,进而确定其敏感性。结果表明:同一渠池、同一工况下,不同分水口的敏感性不同;渠道流量越大,分水口的敏感性越小。但是不同渠道流量下的分水口敏感性差异极小,在实际运行中可忽略其影响,用不同渠道流量下的敏感性平均值来最终表征敏感性。

Constant downstream depth operation is used in the Middle Route of South to North Water Diversion Project. Water levels in openchannel fluctuate along with the change of the discharge that is caused by the turnout. The impact can be characterized by sensitivity. The project requires channel water level drop rate no more than 0. 15 m per hour in normal condition. In order to keep the water level of channels in the turnout flow change can satisfy this requirement, it studied and confirmed the sensitivity through building 1-D hydrodynamic model of South to North Water Diversion Project and studied the change process of water level before the check gate that was caused by discharge change of the turnout. The result shows that in the same open channel and conditions, different turnouts have different sensitivity and the more discharge of channel, the less sensitivity of the turnout. But the sensitivity difference in different channel flows is so small that can be ignored in actual run.