Study On Design Floodcombination And Flood Control Water Level Under Combined Action Of Main Stream And Tributary Flood

For in the main stream and tributary confluence on a tributary of the sluice.Not only directly affected the tributary flow,but also by the effect of main stream backwater effect.Calculate the Flood combination level is multivariate problems about main stream and tributaries.In the design of the sluice in the actual calculation,often just select some combination of Flood,did not fully consider the different combinations of flood situation.It will bring risk to the normal operation of sluice.To solve this problem,use the relationship between the Copula function to describe the flood main stream and tributaries and the combination of a large number of simulation of Monte Carlo Main stream and tributaries flood different simulation methods.Through the combined use,construct the mains tream and tributary water sluice flood combination level model(hereinafter referred to as the calculation model of water level).By use the calculation model of water level to the Guiping shipping hub engineering.The calculation shows that the model can effectively solve the flood control level calculation of the sluice under the action of main stream and tributary flood,and the result is reliable,And calculation also shows that the project uses 100 years flood water level is greater than model's reseult 43.31m,illustrate the design results of Guiping shipping hub project safety.Comply with the design standards of flood control sluice under the action of the main stream and tributaries Flood combination there are numerous,the distribution and the corresponding design water level are related to flood correlation,correlation,sluice discharge capacity,water level and flow about the relationship between the main stream and tributaries flood:the correlation is stronger,the design flood combination flow range is small,the larger the return period of flood control the design water level is higher,the smaller the return period of design flood stage is lower;flood related conditions,River tributaries or peak flow is larger,combination of design flood frequency unchanged,but the design flood peak increase,corresponding to the higher water sluice design of flood control sluice;increase the discharge capacity,will not change the design flood combination,but the corresponding the design of flood control water level decreased;under the dam water level is more sensitive to the river flood,flood in river flow design combined range is small The larger the value of tributary flow,the corresponding design level of flood control is determined by the flood of main stream.The design of flood control sluice design water level of the main stream and tributaries flood commonly used in practical engineering calculation method for the analysis found that:the design of flood control water level use co-occurrence return period as the design return period calculated is low,not up to the requirements of design standard;design of flood control use union return period as the design return period the results will be safe;average flow frequency of flow + a specific tributary flow as the design flood stage design flood combination calculation are required according to the degree of influence of flood water level in the dam or tributaries to determine whether results of safety.Based on the above conclusions,it is suggested that the water level calculation model be used to calculate the water level of flood control design in actual sluice design.