High-efficiency calculation method for watershed rainfall-runoff routing using one-dimensional dynamic wave equations |
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| Authors: | Jun Li " target="_blank">Xiao-jun Guo " target="_blank">Ling-ling Zhao |
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| Institution: | 1.Key Laboratory of Mountain Surface Process and Hazards/Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu,China;2.Guangzhou Institute of Geography Guangdong Academy of Sciences,Guangzhou,China |
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| Abstract: | Efficiency in solving the Saint-Venant equations for watershed rainfall-runoff routing is important in flood hydrology. This paper presents a high-efficiency numerical solution of one-dimensional dynamic wave equations (HEDWE) for watershed rainfall-runoff routing, in which the full momentum equation is written as a quadratic equation with only one unknown variable Q, water depth is derived from the continuity equation using the two-step predictor-corrector method, and the discrete scheme is the explicit upwind scheme. The results of numerical tests showed the HEDWE approach has several major advantages. 1) It is a stable numerical method, even for an initially dry area. 2) Its computational efficiency is higher than 4.76E+05 times/s. 3) It can be used for overland flow, river flow, and combinations thereof. The primary disadvantages of the HEDWE approach are its unsuitability for rapidly varying flow, such as dam-break floods. |
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