Research on Waterway Regulation of Fluctuating Backwater Zone of Ankang Hydro-junction

摘要

The navigation water flow conditions in fluctuating backwater zone of Ankang hydro-junction not only are influenced by daily regulation flow of Shiquan hydro-junction upstream, but also are influenced by reservoir operation of lower Ankang hydro-junction. The flow in fluctuating backwater zone is characterized not only with the characteristics of mountainous river, but also with the characteristics of reservoir area. At the same time, the reach is a continuous rush curve reach with rapid flows. This paper presents a study of two-dimensional modeling for fluctuating backwater zone of Ankang Hydro-junction, following a sustained research program. A depth-averaged two-dimensional mathematical model is established under the orthogonal curvilinear body-fitted coordinate system with staggered grid. The governing equations of flow are discretized with the finite volume method. The computed water level, velocity are verified by field data in the fluctuating backwater zone of Ankang Hydro-junction. It is shown that the flow field in fluctuating backwater zone can be simulated reasonably well. According to the characters of the fluvial process and navigation-obstruction, the regulation method is presented. Based on the aforementioned regulation method, Variations of water level, surface slope and flow velocity, caused by the regulation works in fluctuating backwater zone of Ankang Hydro-junction are analyzed. And finally, the reasonable regulation works are proposed.