Unstructured grid two-dimensional flood simulation system based on GPU acceleration technology

The invention discloses an unstructured grid two-dimensional flood simulation system based on a GPU acceleration technology, and the system comprises the steps of carrying out the spatial discretization of a simulation region, and obtaining a triangular grid terrain file, and reading the file, and storing nodes and unit data in the file in program variables, establishing a topological relation forthe file according to a principle that point numbers of two adjacent triangles sharing one side are the same, calculating a related variable of each triangular grid according to the established topological relation, converting the coordinate value in the node into a unit, and initializing each related variable, allocating memories to all the variables in the GPU, and copying values of the variables into GPU variables, respectively calculating a flux item, a bottom slope source item, a friction resistance source item and time stepping on the GPU, and copying a result value calculated on the GPU into a host memory, and