小清河治理前后干流过流及行洪能力分析

Analysis of Flow and Flood Discharge Capacity of the Main Stream of Xiaoqing River Before and After Improvement

摘要:

小清河综合治理及复航工程实施后,河道下垫面发生重大变化,尤其通航后长期高水位运行,函需摸清河道过流能力,用于防洪调度。通过对小清河治理后全断面过流能力模拟分析,结果表明:1)济青高速公路桥柴庄闸段河道推算洪水位略高于设计洪水位,柴庄闸以下段推算洪水位普遍低于设计洪水位,治理后河道过流能力显著提升;2)通航后,高水位常态化运行相比不通航时,50年一遇洪水位提高 0.059~ 0.251m ,洪峰出现时间提前 10\~ 40min ,通航对防洪调度有一定影响。

Abstract:

After the implementation of the comprehensive improvement and navigation restoration project of Xiaoqing River, significant changes have taken place in the river's underlying surface. In particular, the river has been operating at a high water level for a long time after navigation, making it urgent to find out the river's flow capacity for flood control and discharge. Through the simulation analysis of the fullsection flow capacity of Xiaoqing River after improvement, the results show that: 1) The calculated flood level in the section from Jinan-Qingdao Expressway Bridge to Chaizhuang Sluice is slightly higher than the designed flood level, while the calculated flood level in the section below Chaizhuang Sluice is generally lower than the designed flood level, indicating that the flow capacity of the river has been significantly improved after improvement; 2) After navigation, compared with the non-navigation period, the 50- year return period flood level increases by 0.059~ 0.251m under the normalized operation of high water level, and the peak flood occurrence time is 10- 40 min utes earlier, which shows that navigation has a certain impact on flood control and discharge.