The Joint Water Supply Operating Model And Rule Of Major Reservoirs In Liaohuntai Basin

With the gradual formation of the large-scale multi-reservoir system, the connective way of river, reservoir and basin has become complex and diverse. The joint operation of multi-reservoir appears many new characteristics and difficulties due to changes in connective patterns. Its comprehensive operation and management become more and more complex. Therefore, the research on the method and theory of large-scale multi-reservoir joint operation and the derivation of feasible operating rules under connective conditions are becoming an important topic. For this reason, the water supply multi-reservoir system in Liaoning province has been taken as the research object in this dissertation. The determination of operating rules, constructing and solving of the model and inter-basin water transfer mechanism for water supply multi-reservoir under connective conditions are studied based on the two aspects of the theory and case application. Research contents and results are as follows:(1) Based on long-term observed runoff data, the varying characteristics of annual and inter-annual inflow of four large reservoirs in Liao river basin of Liaoning Province are analyzed. The Spearman's trend test and Mann-Kendall trend test are used for analyzing changing trend of the inflow from large reservoirs in the study area. Meantime,2D joint distribution model is established based on Copula function. Then this model is used to analyze and estimate the characteristics and abilities of the runoff compensation between reservoirs or basins.(2) According to the current water supply scheduling mode of multi-reservoir in Liaoning Province, the watershed is divided into multiple water supply units. Then each water supply unit is simplified to obtain network topology. Based on the divided water supply inits, optimization method is applied in optimal operation of single reservoir, reservoirs in series and parallel for each water supply unit so that we obtain optimal water supply scheduling scheme including optimal scheduling chart and operating rules of reservoir (multi-reservoir) and determine the maximum water supply capacity of single reservoir (single basin) under the current condition.(3) For joint operation problem of water supply multi-reservoir, we propose a solving framework to determine joint operating rule of equivalent reservoir based on aggregation-disaggregation approach. In this framework, the water supply multi-reservoir is combined into an equivalent reservoir. Then two types of water supply policies are proposed to guide the water supply management of equivalent reservoir in aggregation stage. Meanwhile, different types of static and dynamic allocation methods are presented to achieve the allocation of water-supply multi-reservoir in disaggregation stage. This framework is applied in water supply operation of Qinghe, Chaihe parallel reservoirs to analyze the effects of different operating rules on joint operation performance of multi-reservoir system.(4) Taking multi-reservoir in the Huntai basin as the research object, we adopt two different ways to construct joint operating models ? and ? (JOR-? and JOR-?) and formulate joint operating rules for multi-reservoir. Based on that, optimal operating rules are determined using simulation-optimization model. The rationality of joint operating rules is verified by comparing the optimal operation results of different operating rules based on observed inflow data. Meanwhile, in order to decrease the effect of inflow uncertainty on model application results, a first-order autoregressive and disaggregation model is proposed to generate ten-day synthetically inflow data. Then synthetic inflow data is the input of JOR-? and JOR-? to analyze the rationality and difference of two joint operating models.(5) Spatial topological structure of the inter-basin water transfer system is analyzed. And the joint operating rules that consider water supply and water transfer of water distribution system simultaneously for bidirectional inter-basin water supply multi-reservoir are presented. The rules propose the triggering mechanisms for water transfer based on water-transfer rule curves of two equivalent reservoirs for regulating the bidirectional water transfer between two basins. The triggering mechanisms take the beginning-period-storage of multi-reservoir as identification index. The allocation of water is achieved by establishing the relationship between the total beginning-period-storage of multi-reservoir and water transfer rule curves. To verify the reasonability and validity of the proposed operating rules, four different operation scenarios are proposed to guide the joint operation of multi-reservoir in Liaohe basin that contain bidirectional inter-basin water transfer project. The results demonstrate that the bidirectional inter-basin water transfer scenario can increase water supply between two multi-reservoirs and water supply reliability for each agricultural irrigation areas simultaneously, and guide water supply of multi-reservoir between basins in a mutually beneficial way.Finally, the conclusions are drawn and the problems to be further studied are discussed.