低涌变电站溃坝洪水发展演进的研究

以东莞低涌变电站为例,讨论100 a一遇洪水时上游发生溃坝的洪水波演进的特性。针对电站所处挂影洲围四周河道环绕的特点,将整个溃坝过程分三阶段模拟。首先利用二维溃坝模型模拟得出溃口流量、洪水流场、溃坝波高及其传播时间等特征;再讨论溃坝波传播并淹没整个挂影洲围的过程;最后应用堰流公式等计算洪水逐渐抬高水位,直至与河道水位齐平过程的水位流量过程线。以此来探讨从堤坝溃决到结束的整个过程中不同阶段的水位、流速和流量变化规律。

Research on the Evolution and Development of Dam-break Flood for Dichong Substation

Taking Dongguan Dichong Substation as an example,the characteristics of dam-break flood evolution was discussed in the case of a once-in-100-year flood.The whole dam-break process is divided into three phases for simulation based on the features of the river around Guayingzhouwei,where the substation is located.Firstly,a two-dimensional dam-break model is used to calculate the amount of flood,the flow of flood,the dam-break wave height,and some other characteristics.Then the process of flood spread and the inundation of Guayingzhouwei are discussed.Finally,weir flow formula is adopted to calculate the heightened water level and the flow process line,so as to explore the pattern of changes in terms of water level,velocity and flow in the whole process of the dam outburst from beginning to end.