Coupling a 1D-local inertia 2D hydraulic model for flood dispatching simulation in a floodplain under joint control of multiple gates

Daming Li (), Shuo Chen (), Zhu Zhen (), Shilong Bu () and Yanqing Li ()
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Daming Li: Tianjin University
Shuo Chen: Tianjin University
Zhu Zhen: Tianjin University
Shilong Bu: Tianjin University
Yanqing Li: Ministry of Ecology and Environment of People’s Republic of China

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2021, vol. 109, issue 2, No 20, 1820 pages

Abstract: Abstract A 2D local inertial equations model coupled with a 1D hydraulic model was established to simulate flood dispatching in river and flood detention areas. A simplified first-order accuracy finite volume method (FVM) solution was applied to the 2D model, and the source-type linking method was used at the coupling zones. The coupled model was calibrated by the historical flood process in the Daqing River basin, satisfactory agreements were obtained at the gauge points, and the flood arrival time was consistent with the recorded data. A flood dispatching simulation in the scenario of joint control of multiple gates was then performed. The operation sequence of the corresponding gates and the flood routing in each sub-basin were consistent with the dispatch rules. The convergence analysis based on the grid scale and convective acceleration terms was presented. The results indicated that a refined grid-scale yields better accuracy of the numerical solution, but this improvement is constrained by the resolution of the digital elevation model (DEM). In the lower range of Fr, the results of the hydraulic variables and the flood behaviours obtained by the local inertial equations model are identical to those of the full shallow-water equations (SWEs) model, which suggests that the approximation based on neglecting the convective acceleration terms is reasonable for the practical case of low velocity combined with an insignificant depth gradient.

Keywords: Coupled 1D–2D model; Local inertial equations; Flood dispatching; Grid scale; Convective acceleration terms (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s11069-021-04899-z

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