Abstract
The construction of bridges and other structures across the river will affect the flood discharge capacity and local water potential of the river.Based on navier-Stokes equation of MIKE21FM hydrodynamic module, this paper carries out two-dimensional numerical simulation of part of Shixi River. By optimizing the grid near the piers to reduce the difference brought by the terrain generalized grid of the real river, it simulates and analyzes the length of the curve of yong-high and Yong-water under different flood frequencies,the Nash-Sutcliffe efficiency coefficient and relative error analysis are used to verify the rationality of the results. The simulation results can accurately reflect the real changes of river water level, It provides a theoretical basis for flood impact analysis.
Highlights
At present, scholars at home and abroad have made fruitful research achievements on the impact of Bridges across rivers on river regime and accumulated a lot of engineering experience
Scholars at home and abroad have made fruitful research achievements on the impact of Bridges across rivers on river regime and accumulated a lot of engineering experience. They proposed the empirical formula of bridge yong Shui under different working conditions[1], which has been widely applied in engineering due to its simple form and easy application.With the development of computer technology, the limitations of traditional empirical formulas are gradually revealed, and numerical simulation is developing towards precision and visualization
Shixi River is a first-grade tributary of Pingshan River, located in the northeast of Pingshan River basin, originating from Bijia Mountain in Huizhou, and flowing into the main stream of Pingshan River from Tugang Ling downstream
Summary
Scholars at home and abroad have made fruitful research achievements on the impact of Bridges across rivers on river regime and accumulated a lot of engineering experience. The river length is 12.328km, with an average specific drop of 11.7‰, and the basin area is 23.33km, among which the basin area in Shenzhen is 5.83km.The upper part of Shixi River is located in Daya Bay District, Huizhou, which is known as Shitou River locally. It originates from The Bijia Mountain (elevation 717.5m) bordering Shenhui. Shitou River is located in Huizhou and has a tributary, about 3.0km in length, with a rainwater harvesting area of about 3.5km
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