Research On The Flood Prevention Planning And The Flood Diversion Or Detention Simulated Model For The Regions Of Flood Storage And Discharge

This paper reviews the current research on the flood prevention planning and makes a summary of the basic theories on it. As an example, it takes the subject of the flood prevention for Siping reservoir in Baokang of Hubei Province to apply those principles. As a new normal flood deployment method, storage and discharge—double controlled method is firstly presented to solve the flood dictating rule of Siping reservoir for the downstream town Gucheng. It's for the first time to set up a flood diversion and detention coupling simulated model which targets to the reach from Xianyang to the location of Xinlong Project in the Midstream and downstream of Han River and fourteen regions of flood storage and discharge along the reach bank. Using this model, we can study and plan how to manage the fourteens.The main idea of the storage and discharge—double controlled method is to find out the proper flow index of standard storage and the maxim discharge by Trying calculation of different types of typical floodwater series. Then take the two ascertained indexes as limits: if the amount of inflow floodwater is small, then reduce the storage flow to ensure the need of electricity generation;if is moderate, then store the same standard storage flow to the reservoir, which simplifies the operation;if is excessive, then control the maxim discharge flow to ensure the flood safety of the downstream area. This method has clear conception and it's simple for operation. The flood dictating rule of Siping reservoir for the downstream town Gucheng is successfully solved by using this.As for the flood diversion or detention simulated model, basing on the universal arithmetic of dendriform river network, using preissmann implicit scheme to disperse the De saint-venantequations, first to set up the one-dimensional hydrodynamic flood routing model of the reach from Xianyang to the location of Xinlong Project in the Midstream and downstream of Han River, and to couple the zero-dimensional that is generalized from the fourteen regions of flood storage and discharge to the above flood routing model by the connection model that is generalized from weir and strobe to form a flood diversion or detention simulated model. Hydrodynamic simulating model can conquer the shortage of traditional method using the channel storage curve that can only get a total amount of the diversion or detention floodwater roughly. By setting different operation condition, we can use this model to simulate the stream in the main watercourse and the regions of flood storage and discharge to lucubrate the proper order and opportunity to put to use these regions to get the best effect of preventing flood.