Effects of the Lihe River Reconstruction Project on the Flow Regime of the Shahe and Lihe Rivers in Luohe City
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Abstract:
In order to ensure the flood control safety in the Xicheng district of Luohe City and reduce the flood control pressure at the urban section of the Lihe River, a new river channel was planned to be excavated in the Dalouwei village where the Shahe River and Lihe River are the closest, and thus the flood in the Lihe River can be diverted into the Shahe River. In this paper, nine scenarios of flood discharge were selected to develop the three-dimensional numerical models and physical models. In order to provide the basis for project design, hydraulic characteristics in the Lihe River and Shahe River before and after the reconstruction project were investigated, and the effects of the reconstruction project on the river regime were analyzed. The results showed that the water level and flow velocity in the Shahe River have insignificant changes under different scenarios of flood discharge, and the flow velocity in the upstream of the Lihe River reconstruction section increases slightly and the water level in the upstream of the Lihe River reconstruction section can increase or decrease under different scenarios of flood discharge. Therefore, the implementation of the Lihe River reconstruction project has impacts on the river bend section of the Shahe River at the outlet of reconstruction section. The section needs to bear the two-way river flow in the upstream of Shahe River and Lihe River, which can have turbid flow field, and thus the slope protection engineering is needed.
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