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• W3019462893 abstract "Abstract Two‐dimensional shallow water models have been widely used in forecasting, risk assessment, and management of floods. Application of these models to large‐scale floods with high‐resolution terrain data significantly increases the computation cost. In order to reduce computation time, shallow water models are simplified by neglecting the inertial and/or convective acceleration terms in the momentum equations. The local inertial models have proved to significantly improve the computational efficiency even for large‐scale flood forecasting. However, instability issues are encountered on smooth surfaces of urban areas having low friction values. This problem was resolved by de Almeida et al. (2012, https://doi.org/10.1029/2011WR011570 ) by introducing limited artificial diffusion in the form of weighting factors for the neighboring fluxes. The arbitrary value of the weighting factor poses a practical limitation of being case specific and requiring calibration for accurate solutions. This study derives an explicit expression for the weighting factor, an adaptive formulation dependent on local velocity, flow depth, grid, and time step size, which eliminates the need for trials and approximations. Comparisons between analytical, experimental, and real‐world applications confirm the accuracy and robustness of the proposed weighting factor. Implementation of adaptive weights results in less computation time compared to LISFLOOD‐FP (~1.2 times) and holds a significant advantage over HEC‐RAS (~25.9 times) as it allows the use of larger time step at higher Courant‐Friedrichs‐Lewy (CFL) values. The contribution of the present study therefore resolves an important problem of current large‐scale flood simulations, especially those implemented in real time." @default.
• W3019462893 created "2020-05-01" @default.
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• W3019462893 date "2020-07-01" @default.
• W3019462893 modified "2023-09-25" @default.
• W3019462893 title "Explicit Expression of Weighting Factor for Improved Estimation of Numerical Flux in Local Inertial Models" @default.
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• W3019462893 doi "https://doi.org/10.1029/2020wr027357" @default.
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