本研究采用模拟实验对闽江流域氨氮的降解规律进行研究，降解系数采用稳态一维降解模型进行分析计算，闽江上游流域氨氮的平均降解系数为0.140～0.260 d -1，中下游流域氨氮的平均降解系数为0.099～0.203 d-1。结果表明，闽江上游流域...本研究采用模拟实验对闽江流域氨氮的降解规律进行研究，降解系数采用稳态一维降解模型进行分析计算，闽江上游流域氨氮的平均降解系数为0.140～0.260 d -1，中下游流域氨氮的平均降解系数为0.099～0.203 d-1。结果表明，闽江上游流域氨氮自净能力比中下游流域的自净能力好，古田溪断面的氨氮平均降解系数低于全国的平均值，说明氨氮自净能力相对较弱，本研究为确定流域水环境容量和纳污能力及制定污染物总量控制提供科学依据。展开更多
In this paper, a hybrid improved particle swarm optimization （IPSO） algorithm is proposed for the optimization of hydroelectric power scheduling in multi-reservoir systems. The conventional particle swarm optimizati...In this paper, a hybrid improved particle swarm optimization （IPSO） algorithm is proposed for the optimization of hydroelectric power scheduling in multi-reservoir systems. The conventional particle swarm optimization （PSO） algorithm is improved in two ways： （1） The linearly decreasing inertia weight coefficient （LDIWC） is replaced by a self-adaptive exponential inertia weight coefficient （SEIWC）, which could make the PSO algorithm more balanceable and more effective in both global and local searches. （2） The crossover and mutation idea inspired by the genetic algorithm （GA） is imported into the particle updating method to enhance the diversity of populations. The potential ability of IPSO in nonlinear numerical function optimization was first tested with three classical benchmark functions. Then, a long-term multi-reservoir system operation model based on IPSO was designed and a case study was carried out in the Minjiang Basin in China, where there is a power system consisting of 26 hydroelectric power plants. The scheduling results of the IPSO algorithm were found to outperform PSO and to be comparable with the results of the dynamic programming successive approximation （DPSA） algorithm.展开更多
文摘本研究采用模拟实验对闽江流域氨氮的降解规律进行研究，降解系数采用稳态一维降解模型进行分析计算，闽江上游流域氨氮的平均降解系数为0.140～0.260 d -1，中下游流域氨氮的平均降解系数为0.099～0.203 d-1。结果表明，闽江上游流域氨氮自净能力比中下游流域的自净能力好，古田溪断面的氨氮平均降解系数低于全国的平均值，说明氨氮自净能力相对较弱，本研究为确定流域水环境容量和纳污能力及制定污染物总量控制提供科学依据。
基金supported by the National Natural Science Foundation of China (Grant No. 50679011)
文摘In this paper, a hybrid improved particle swarm optimization （IPSO） algorithm is proposed for the optimization of hydroelectric power scheduling in multi-reservoir systems. The conventional particle swarm optimization （PSO） algorithm is improved in two ways： （1） The linearly decreasing inertia weight coefficient （LDIWC） is replaced by a self-adaptive exponential inertia weight coefficient （SEIWC）, which could make the PSO algorithm more balanceable and more effective in both global and local searches. （2） The crossover and mutation idea inspired by the genetic algorithm （GA） is imported into the particle updating method to enhance the diversity of populations. The potential ability of IPSO in nonlinear numerical function optimization was first tested with three classical benchmark functions. Then, a long-term multi-reservoir system operation model based on IPSO was designed and a case study was carried out in the Minjiang Basin in China, where there is a power system consisting of 26 hydroelectric power plants. The scheduling results of the IPSO algorithm were found to outperform PSO and to be comparable with the results of the dynamic programming successive approximation （DPSA） algorithm.
