Multi-objective optimal operation of reservoir group in Jialing River based on DREAM algorithm

With the implementation of the most stringent water resources management system and the advancement of the construction process of reservoir terrace basin, the research and application of the theory and method of joint operation of reservoir groups are becoming more and more important. The Differential Evolution Adaptive Metropolis (DREAM) algorithm is a sampling algorithm based on the Markov Chain Monte Carlo method proposed in recent years. The algorithm satisfies the ergodicity and is good at handling problems with multivariate nonlinearity, high dimensionality, and multi-peaks, as such the alogrithm is a new global optimization solution. This paper elaborated the solution mechanism of the standard DREAM algorithm, and the algorithm was applied to the optimal operation model of the reservoir group in Jialing River. First, we optimized and analyzed the multi-objective supply operation model of reservoir group water in Jialing River. Then the multi-attribute decision-making and evaluation index system of water supply operation rules for reservoir group to assess the optimization of the operation model was adopted. Finally based on the results of evaluation, the best water supply operation scheme for reservoir group of Jialing River was selected. The results show that the Baozhusi Reservoir can fully meet the planned water supply requirements in the dry year, while the two reservoirs, Shengzhong and Tingzikou, need to be weighed against the evaluation indexes of water supply operation. The research provides a theoretical basis for the DREAM algorithm in the optimal operation of the reservoir group and the actual operation scheme for the reservoir group of Jialing River.