运河通航水流条件直接关系着船舶航行安全,通过整治工程能够有效改善对通航不利的水流条件。平陆运河工程对原河道加宽挖深后,原河道沿线汇入支流会与运河产生较大河底高程差,支流直接以高落差入汇会对干流通航水流条件产生不良影响。新坪水支流是其中与运河具有较大河底落差与较大交汇角度的代表性支流之一,为确保平陆运河通航顺畅,通过定床河工模型试验,研究新坪水支流汇入口河段通航水流条件,提出整治方案。结果表明:在运河修建基础上,加宽干支流河道、沿支流口增设消力池及导流堤后,各洪水工况下的通航水流条件均得到显著改善。研究结果能为类似河段航道整治提供参考。

The navigation flow conditions of canal directly impact ship navigation safety. Channel regulation measures can effectively alleviate unfavorable flow conditions. In the Pinglu Canal project, after the original channel was widened and deepened, a significant bottom elevation difference emerged between the canal and the tributaries along the original river course. These tributaries, entering the confluence with a large drop, adversely affect the navigable flow conditions of the mainstream. Xinpingshui is a representative tributary with a large riverbed elevation difference and a wide intersection angle with the canal. To ensure smooth navigation in the Pinglu Canal, we conducted fixed-bed model tests to investigate the navigable flow conditions at the confluence of the Xinpingshui tributary and the main canal. Based on the test results, we proposed corresponding regulation measures. Results indicate that, on the basis of the canal construction, widening both the main and tributary channels and installing additional dissipation pools and diversion dikes at the tributary mouths significantly improve the navigational flow conditions under various flood scenarios. The findings of this study can serve as a reference for improving navigation channels in similar river reaches.