本文旨在將連續方程式、擴散方程式及濃度擴散方程式、分別合併為兩個二階非線性偏微分方程式求得流量及濃度之解析解。 在規則渠道中使用矩形、梯形與三角形渠道做模擬並比較其中之變化。在慣性項很小(So<0.001)所以擴散波與動力波相去不遠之條件下可得到一可靠之模擬。 在下游有邊界條件下在上游時仍受入流歷線之影響；中游時因同時受上、下游邊界條件之影響而流量與濃度增加；在渠道出流前數百公尺處在迴水影響下特別明顯與下游邊界條件歷線有高度相關。 This paper will be the continuity equation, diffusion equation and the concentration of diffusion equation, namely the merger of two second-order nonlinear partial differential equations obtained by analytical solution of flow and concentration. Channels in the rules used in rectangular, trapezoidal and triangular channels of analog and compare them to do the change. The inertia is small (So <0.001) Therefore, diffusion wave and dynamic wave obtained under conditions not far from a reliable simulation. Boundary conditions in the downstream when the upstream inflow hydrograph still influence; River due to be on the same time, the downstream effects of boundary conditions to increase flow and concentration; to channel the flow of hundreds of meters in the former backwater influence particularly evident with the hydrograph downstream boundary conditions are highly correlated.
