Huang, J. and Zhang, H., 2019. Influence of the flood on the flow characteristics in different flood and tide combination scenarios: A case study in Puyang River a tributary of Qiantang River. In: Guido-Aldana, P.A. and Mulahasan, S. (eds.), Advances in Water Resources and Exploration. Journal of Coastal Research, Special Issue No. 93, pp. 178–184. Coconut Creek (Florida), ISSN 0749-0208.

Based on the background of Puyang Jiang River, a 2D hydrodynamic model was built to explore the distribution characteristics of tidal range in the downstream section of Puyang River under different flood tide combinations between Puyang River and Qiantang River. The influence of different frequency floods and flood discharges of Puyang River on the flood level of Puyang River was analysed. The results show that the tidal range at each point of the exit section decreases with the increase of floods in Puyang River. Under the same flood conditions of Puyang River, the tidal range at each point of the river increases with the increase of the Qiantang River rushing tide; under the same characteristic tidal conditions, the tidal gradient along the water flow direction of the Sanjiangkou-Xizhuang section increases with the increase of floods in the Puyang River. When Puyang Jiang River suffered flooding from once ten years to twenty years and then to fifty years, the mean value of water level reduction of east and west river is from 0.66 cm to 0.72 cm and then to 0.63 cm, namely, the sensitivity of the discharge of Gaohu flood retarding basin to the water level of east and west river of Puyang Jiang River is first strengthened and then weakened. The research results provide a guidance for flood regulation of Puyang River and optimization of operation in Gaohu flood detention area.