Operation And Scheduling Research Of Han-to-wei River And Jialing-to-han River Complex Inter-basin

Inter-basin water transfer is a major strategic measure to solve regional water shortages,maintain social and economic sustainable development,and improve the natural ecological environment.With the continuous growth of the world's population and rapid economic and social development,the scale of inter-basin water transfer projects has expanded dramatically.Especially when there are multiple water sources,the multiple nesting relationships between the water sources make their operation and scheduling extremely complicated.Therefore,it is of great significance to study the operation and scheduling of complex inter-basin water transfer projects with multiple water sources nested,which could tap the potential and benefits of the project and expand the,operation theory of complex water resources system.In this thesis,we analyzed the law of abundance and dryness of runoff in Jialing River and Han River.Considerign two cases(i.e.,in the presence and absence of the new water source of Jialing-to-Han River inter-basin water transfer project),we established and then solved the joint scheduling model of pump station-reservoir-hydropower station for the early and normal operation stages of the Han-to-Wei inter-basin water transfer project.We formulated the optimal scheduling plan for the Huangjinxia and Sanhekou reservoirs and studied the law of water level at the end of the year of Sanhekou multi-year regulating reservoir in the early and normal operation periods.The research results can provide guidance for maximizing the comprehensive benefits of the inter-basin water transfer project.The main research findings are as follows:(1)Based on the uneven coefficient method,the extreme value ratio method,the cumulative anomaly method,the MK trend test method,rescaled range method and the Copula function method.The characteristics of the spatio-temporal changes of the runoff and the law of abundance and dryness of runoff of the Jialing River and the Han River were revealed.(2)Irrespective of the new water source of Jialing-to-Han River inter-basin water transfer project,a simulation operation model of pump station-reservoir-power station was established at the early operation stage of the inter-basin water transfer project,and a self-iterative simulation algorithm was used to solve the model under four dispatching schemes.The results showed that:Under the strict constraint of the water transfer process of the Yangtze River Commission,changing the water transfer constraints within the year,schemes 1-3 could not meet the engineering design requirement of an average water supply target of 1.5 billion m3 for many years.The water transfer volume of the scheme 4 reached 2.054 billion m3.Although it met the requirement of water supply target of 1.5 billion m3,this was an ideal working condition.The scheme did not consider associated impacts on the middle route of national south-north water diversion project.(3)Considering the new water source of Jialing-to-Han River inter-basin water transfer project,with the minimum water shortage rate and the maximum water transfer volume as the targets,two optimal dispatching models of the pump station-reservoir-power station were established.These two models were solved using an improved cuckoo algorithm.The results showed that the maximum water transfer volume model was recommended,namely,Jialing-to-Han River inter-basin water transfer project could meet the requirement of water replenishment of the Han-to-Wei River inter-basin water transfer project when the water transfer was over 40 m3/s.In strict compliance with the water transfer process of the Yangtze River Commission,the model could ensure an average water transfer target of 1.5 billion m3 for many years,a water supply guaranteed rate of 96%and a minimum water supply degree of 73%,which could meet the design requirements of the project.(4)Based on the optimized scheduling strategy of the long series of the reservoir,the joint operation diagram of Huangjinxia and Sanhekou reservoirs was drawn.In addition,an artificial neural network model was establishedwas and trained,formulating the optimal operating rules for the project.The artificial neural network can be directly used to guide called for system's scheduling.(5)Using multiple stepwise regression method,main factors affecting the end-of-year water level of the Sanhekou multi-year regulating reservoir were screened,and the end-of-year water level equations in the early and normal operating stagtes were respectively established to clarify the end-of-year water level laws.The results showed that the regression coefficients of the reservoir inflow volume and water supply volume of the current year of the Sanhekou reservoir were much larger than other factors,and thus they were dominant factors controlling the end-of-the-year water level of the Sanhekou reservoir.(6)An uncertainty analysis framework was proposed for the operation of inter-basin water transfer projects.Using Latin hypercube sampling,Pearson-? distribution and simulated annealing algorithm,a 10,000-year runoff sequences were generated,which represented the uncertain input of the reservoir optimal dispatch model.The results showed that the project would be greatly affected by the uncertainty of runoff in the future operation,resulting in a performance degradation characterized by various indicators.After the incorporation of the new water source,the impact of runoff uncertainty could be significantly reduced.