Impact of Plain River Network Structure on Hydrodynamics in Lubu Town of Ningbo
The hydrodynamics of plain river networks plays a crucial role in maintaining regional ecological balance and biodiversity,with the structure of the water system directly affecting the connectivity and mobility of the riv-er network.Taking the river network in Lubu Town of Ningbo as an example,the current structure of the water system is summarized and a two-dimensional river network hydrodynamic model based on the theory of shallow water equations is constructed.The model is verified with actual measured data.Three types of river network structures are constructed through different connectivity methods,and the patterns of water flow within the net-work under two flow conditions are simulated and analyzed.The results show that under both inflow and outflow conditions,the minimum flow velocity in Yangxi River increases to 0.102 m·s-1 and 0.154 m·s-1,respective-ly.The flow velocities in Baihe Bridge Cross River,Sunjia Cross River,Yanxi River and Zhoujia Bay Pu also im-prove to varying degrees.However,there are sections in Cangqian River where the water body is almost stag-nant,indicating that water system connectivity has a positive effect on improving the hydrodynamics of the river network.If the connectivity is excessive,water stagnation may occur in local areas where flows converge.It is necessary to conduct a detailed assessment before implementing water system connectivity projects.
plain river networkwater system connectivityhydrodynamics modelnumerical simulation
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