Climate change and human activities have great implications for hydrological process and water projects planning. In order to evaluate the impacts on stream-flow, statistical methods and SWAT model are applied to this...Climate change and human activities have great implications for hydrological process and water projects planning. In order to evaluate the impacts on stream-flow, statistical methods and SWAT model are applied to this research. The results indicate that the abrupt change year (1965) of annual stream-flow is chosen as the split point of natural and human influenced (particularly reservoirs) periods. The calibrated SWAT model is proved to be applicable in this catchment and is used to simulate the monthly runoff which can be regarded as the natural runoff induced by climate change. A major finding of this study is that the reservoir regulations have apparently altered the monthly and seasonal stream-flow regimes. By quantifying the impacts of climate variation and human activities, the decreasing trend of annual stream-flow is found, and human activities are proved to be the dominant role in the catchment. This research improves our knowledge of hydrological responses to natural and artificial factors, and provides a better understanding for the future reservoir regulations.展开更多
主要研究纳米流体在压力梯度和外加电场作用下通过多孔管道的流动特性。首先,在Debye-Hückel近似下利用Poisson-Boltzmann方程求解电势场的分布。其次,利用物理相关的边界条件,求解动量方程得到纳米流体的速度的解析解。此外通过...主要研究纳米流体在压力梯度和外加电场作用下通过多孔管道的流动特性。首先,在Debye-Hückel近似下利用Poisson-Boltzmann方程求解电势场的分布。其次,利用物理相关的边界条件,求解动量方程得到纳米流体的速度的解析解。此外通过计算还得到了通道中纳米流体的流动电势和电动能量转换(Electrokinetic energy conversion,EKEC)效率的解析解。进一步用图像分析了流速、流动电势、EKEC效率和体积流率随偶应力参数、达西数、纳米颗粒体积分数和无量纲压力梯度参数变化的变化规律。展开更多
文摘Climate change and human activities have great implications for hydrological process and water projects planning. In order to evaluate the impacts on stream-flow, statistical methods and SWAT model are applied to this research. The results indicate that the abrupt change year (1965) of annual stream-flow is chosen as the split point of natural and human influenced (particularly reservoirs) periods. The calibrated SWAT model is proved to be applicable in this catchment and is used to simulate the monthly runoff which can be regarded as the natural runoff induced by climate change. A major finding of this study is that the reservoir regulations have apparently altered the monthly and seasonal stream-flow regimes. By quantifying the impacts of climate variation and human activities, the decreasing trend of annual stream-flow is found, and human activities are proved to be the dominant role in the catchment. This research improves our knowledge of hydrological responses to natural and artificial factors, and provides a better understanding for the future reservoir regulations.
文摘主要研究纳米流体在压力梯度和外加电场作用下通过多孔管道的流动特性。首先,在Debye-Hückel近似下利用Poisson-Boltzmann方程求解电势场的分布。其次,利用物理相关的边界条件,求解动量方程得到纳米流体的速度的解析解。此外通过计算还得到了通道中纳米流体的流动电势和电动能量转换(Electrokinetic energy conversion,EKEC)效率的解析解。进一步用图像分析了流速、流动电势、EKEC效率和体积流率随偶应力参数、达西数、纳米颗粒体积分数和无量纲压力梯度参数变化的变化规律。
