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| Relationship between flood level response characteristics in Puyang River and operation of its flood detention basin |
| 1. Zhejiang Institute of Hydraulics & Estuary, Hangzhou, Zhejiang 310020, China; 2.College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang 310058, China; 3.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
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Abstract Flood level characteristics of Puyang River were explored under combined conditions of various flood frequencies in Puyang River and different flood discharge rates for Gaohu flood detention basin based on a 2D hydrodynamic model of Puyang River. The results show that when Puyang River suffers from once flooding in ten years, in twenty years and fifty years the mean flood level at a typical observation point of the east and west branch rivers is reduced by 0.62 m, 0.70 m and 0.59 m, respectively. This suggests that the flood level of two branch rivers are the most sensitive to the discharge rate for Gaohu flood detention basin in the condition of once flooding in twenty years. At the same flood frequency, the water level change at various observation points on the rivers increase with increasing total flood discharge rate at Gaohu. At the same flood discharge rate at Gaohu, the water level change at various observation points on the rivers is the maximum at a flood frequency of once in twenty years in Puyang River. The flood level change reduces gradually from upstream to downstream along two branch rivers, and from their downstream merging point to the discharge reach, the level change, however, increases from their upstream inlet to dividing point and along Fengqiao River reach. The results provide a guidance for optimizing operation and management of Gaohu flood detention basin.
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Received: 19 October 2016
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