The present invention relates to a one-dimensional numerical analysis of discontinuous fluid flow, and more specifically, to accurately simulate various types of fluid flow occurring in a stream, i.e., various types of fluid flows generated in various conditions that have been almost impossible to simulate. A method for one-dimensional numerical analysis of discontinuous fluid flow that can be performed. The method of one-dimensional numerical analysis of the discontinuous fluid flow according to the present method obtains Jacobian of the flow term of the one-dimensional governing equation of the fluid flow, the Jacobian in the upstream direction and the Jacobian in the upstream direction and the upstream direction and A first step of obtaining a normalized Jacobian in the downstream direction; Calculating a level and a flow rate of the fluid flow with respect to a reference time by inputting an initial condition; Obtaining a boundary condition between an upstream end and a downstream end of the reference time and distance grid using the initial condition; A fourth step of calculating the eigenvalues of the Jacobian in the flow term, the eigenvalues of the normal Jacobian in the upstream direction, and the normal Jacobian in the upstream direction for the reference point and the upstream point using the boundary conditions of the upstream end; Wow; A fifth value for calculating the eigenvalues of the downstream Jacobian, the eigenvalues of the normal Jacobian in the downstream direction, and the normal Jacobian in the downstream direction, for the reference point and the downstream point using the boundary condition of the downstream end; Steps; A sixth step of applying the Jacobian in the upstream and downstream directions at the reference point to each of the flow and generation terms of the one-dimensional governing equation of the fluid flow; The inherent values of Jacobian in the upstream direction and Jacobian in the upstream direction are applied to the upstream point, Jacobian in the upstream and downstream direction and Jacobian in the upstream and downstream direction with respect to the reference point. A seventh step of applying the eigenvalue of and the Jacobian of the generating term, and applying the eigenvalues of the downstream Jacobian and the downstream Jacobian to the downstream points; An eighth step of constructing a matrix of the one-dimensional governing equations of the fluid flow for the reference time by repeating the routines of steps 4 to 7 for the distance grating; A ninth step of obtaining a water level and a flow rate in a next time grid with respect to the reference time by solving a matrix calculated in the eighth step using a matrix analysis routine; And a tenth step of returning to the second step to transfer to the next time grid to continuously calculate the water level and the flow rate at each time grid.
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