Application Research Of Genetic Algorithms In Flood Control Operation Of Reservoir (Group)

Flood is one of the most serious natural disasters in the world,with a wide range of impacts,which may cause huge economic losses and casualties.Reservoir has strong control ability and storage function for flood.Without additional project investment,reservoir flood control optimization dispatching is an important non-engineering flood control measure which can improve reservoir flood control capacity and play the role of regulating flood peak,saving flood,reducing or even avoiding flood disasters.Therefore,the research on reservoir flood control operation has important scientific significance and application value.In this thesis,the genetic algorithm used to solve reservoir flood control operation model is improved to a certain extent,and the optimal operation of reservoir(group)flood control is studied taking the watershed above Wangjiaba in the main stream of Huaihe River as an example.The main research results of this thesis include:(1)Aiming at the problem that too many constraints are difficult to handle during reservoir flood control dispatching,this thesis studies and improves genetic algorithm,proposes a better method to generate initial population.Further,taking Foziling Reservoir in Huaihe River Basin as an example,two typical measured floods are used to verify the effectiveness of the improved genetic algorithm.The results show that the improved genetic algorithm for generating initial population can narrow the scope of generating initial solution and reduce the number of penalty functions,thus making the model more convenient to apply.(2)Based on the improved genetic algorithm solution model,taking Chushandian Reservoir in the Huaihe River Basin as the background,the reservoir peak shifting flood control operation considering the interval flood is studied.The reservoir flood control operation models based on operation regulation and considering compensation regulation are constructed respectively,and the reservoir discharge and interval flood are transferred to the downstream flood control section by the Muskingum method.The advantages and applicability of different flood control operation models are explored from two aspects of the reservoir flood control operation process and the flood process of downstream control stations,and the foundation is laid for the joint operation of reservoir group flood control in the next chapter.(3)Taking the regional flood in the south of the river basin caused by the rainstorm center as an example,the flood control joint optimal operation model for Chushandian Reservoir,Nanwan Reservoir and Suyahu Reservoir in the basin above Wangjiaba in the main stream of the Huaihe River is established.The influence of the three reservoir joint commissioning on the flood process of the downstream flood control station Wangjiaba is discussed based on the maximum peak shaving criterion,the maximum remaining flood control capacity criterion and the combination of the two.The results show that compared with the separate regulation operation of each reservoir,the joint optimal operation of reservoir flood control can ensure the flood control safety of the reservoir itself and the downstream flood control station at the same time.In addition,the operation mode based on the maximum remaining flood control capacity criterion considers the reservoir capacity allocation strategy,which can help the Nanwan Reservoir to share the flood control pressure of some of the Chushandian Reservoir,and help reduce the flood control risk faced by the reservoir group.