The effectiveness of training engineering of the section from Bengbu to Fushan in the main stream of Huaihe River and the necessity of river training of the section below Fushan

In order to evaluate the benefits of the river training project from Bengbu city to Fushan village of Wuhe county in the main stream of the Huai River and its flood prevention in 2020. Based on measured flood data from 2003, 2007, and 2020, the characteristic water levels and discharges in different typical years were compared and analyzed. A one-dimensional hydrodynamic numerical model was constructed for this section of Huai river, simulating two operating conditions: constant flow and typical years, and evaluating the engineering benefits. The results show that the project significantly reduces the water level in the river channel, reduces the duration of high water level, and effectively alleviates the flood pressure in 2020. The 2020 floods exposed the problem of insufficient discharge capacity in the Hongze lake and river sections. Moreover, the reclamation of the river section entering the Hongze lake, sedimentation at the lake mouth, and increased roughness have further reduced the discharge capacity of the river section. It is necessary to carry out river management below Fushan village, especially the Fengtieying River Diversion, which can significantly increase the discharge capacity of the river and reduce flood pressure.