Research On The Problem Of Yongding River Flood Routiong

Yongding River is one of the four important flood control rivers in China, which wasnamed "Movable River"or "Small Yellow River". The floodwater of this river comes fast,the forecast period is relatively very short, has a huge sediment concentration, the landconfigration is quite steep. The floodwater has a great menace to downstream, which wasthe important and difficult point of flood control in Haihe Water Basin. Tianjin City islocated in the downstream of Haihe River Water Basin as well as the end of the YongdingRiver;therefore the flood control situation is more difficult.It is the wise desion that the flood control engineerings could have been made the bestbenefit and the losts of floodwater have been diminized throuth non-engineering measuressuch as scientific and optimizate dispatching. This thesis makes use of the Yongding RiverFlood Basin Floodwater Forecast and Diversion Model System Soft. According to thechanges of engineering constructions and diversion of floodwater since 1999, it studies thediversion methods of floodwater through non-engineering measures. The results have beenmade as follows:1. Four branch rivers(Tiantanghe River, Longhe River, Beijingpaiwuhe River andChaobaixinhe River) flow into Yongding River steadily and Yongding New River flood isnot diverted, through controlling flood by Beiyunhe River. The ten-year flood in YongdingNew River can get through the flood diversion works safely.2. Four branch rivers flow into Yongding River steadily and Yongding New Riverflood is diverted through Beiyunhe River and 28+082 works (only Western Qilihe floodbasin) along Yongding New River bank. The twenty-year flood in Yongding New Rivercan get through the flood diversion works safely.3. Four branch rivers flow into Yongding River steadily and Yongding New Riverflood is diverted through Beiyunhe River and 28+082, 22+200works (Western Qilihe andDianbei flood basins are used together) along Yongding New River bank. The fifty-yearflood in Yongding New River can get through the flood diversion works safely.4. Tiantanghe River, Longhe River and Beijingpaiwuhe River flow into YongdingRiver steadily and Yongding New River flood is not diverted, through controlling flood byBeiyunhe River. The fifty-year flood in Yongding New River can get through the flooddiversion works safely.5. Tiantanghe River, Longhe River flow into Yongding River steadily and YongdingNew River flood is not diverted, through controlling flood by Beiyunhe River. Thefifty-year flood in Yongding New River can get through the flood diversion works safely.