梯级枢纽间深水复杂流态航道的治理

Management of deepwater complex flow patterns in waterways between cascade hubs

三峡—葛洲坝两坝间航道受汛期流量及水库调度等综合作用,流速大、流态乱、通航条件差,大流量下船舶航行困难,需限制通行,成为制约两坝枢纽通航效率提升的控制性河段。两坝间深水急流险滩主要位于主航道的咽喉地段,无法通过常规整治方法治理。通过炸除礁石等方法调整河床形态、减小河床陡升度、扩大过水面积,对典型碍航滩段“四滩一弯”进行整治。根据莲沱段航道整治实际效果得出,该航段整治效果明显,航道水流条件提升显著。

The waterway between the Three Gorges and Gezhouba dams is affected by the combined effects of flood season flow and reservoir regulation,resulting in high flow velocity,chaotic flow patterns and poor navigation conditions.Under high flow conditions,it is difficult for ships to navigate under large flow and needs to restrict passage,which has become a controlling river section that restricts the improvement of navigation efficiency of the two dam hubs.The deep water rapids and dangerous shoals between the two dams are mainly located at the throat of the main waterway and cannot be treated through conventional remediation methods.In this paper,by means of blasting rocks and other methods to adjust the riverbed shape,reduce the steep rise of the riverbed,expand the water flow area,the typical navigation obstruction beach“four beaches and one bend”is regulated.According to the actual regulation effect of Liantuo section,the regulation effect of this section is obvious,and the flow condition of the channel is improved significantly.