反调节枢纽对河道通航水流条件的影响分析

Influence of re-regulation hydroproject on navigable flow condition

摘要: 利用一维非恒定流数学模型,计算了建反调节枢纽前后、不同电站运行工况下沅水清水塘枢纽至大洑潭枢纽间河段的水力要素,并对各工况下航道流速、比降、水位变幅等通航水力指标进行了分析与比较.在此基础上,探讨了建反调节枢纽前后两坝间非恒定的水流运动及其控制影响因素.结果表明,建反调节枢纽可明显改善通航水流条件;但如果反调节枢纽为低水头枢纽.一些情况下仅通过调整反调节枢纽坝前水位,上游枢纽近坝段每小时水位变幅仍不能满足航运的要求,必须同时调节上游电站的出流过程以改善枢纽问航道内的通航条件.

Abstract: By use of a one-dimensional numerical model developed according to the Saint Venant equations,the hydraulic elements of Qingshuitang to Dafutan reach under various operational conditions before and after construction of the re-regulation hydroprojects are calculated and then the hydraulic indexes such as the navigable velocity,hydraulic gradient and fluctuation in water level are analyzed and compared.And on the basis of analyses the unsteady flow and its control factors between two dams before and after co...