Clearly, water conservancy projects are advantageous for human beings; however, they significantly change the streamflow variability of rivers. This change is a result of the complex and non-linear interactions between natural processes and human activities. Thus far, our understanding of these interactions is still inadequate. In this study, these interactions were evaluated for a large river basin (i.e. the Pearl River basin) with numerous reservoirs to identify reservoir operation scenarios for mitigating drought and flood impacts. To this end, first, the flow variability pattern was derived based on the concept of the admissible range of flow variability. Second, the moving average over shifting horizon method was used to evaluate the effects of the reservoirs on the streamflow variability. Finally, the network theory and data mining technology were applied to establish the streamflow relations between the upstream and downstream reservoirs. The results show that the cascade reservoirs reshape the streamflow variability patterns of the Pearl River in time and space and have a cumulative effect on the downstream runoff. The constructed networks and the identified operation scenarios present that this effect is mainly influenced by the upstream critical reservoirs having different inflows and storage capacities. This suggests the varied roles of the reservoirs for drought mitigation and flood control limiting the formulation and application of integrated operating strategies for the multi-reservoir system.

显然，水利工程对人类是有利的。但是，它们极大地改变了河流的流量变化性。这种变化是自然过程与人类活动之间复杂而非线性的相互作用的结果。到目前为止，我们对这些相互作用的理解仍然不足。在这项研究中，对具有大量水库的大型流域（即珠江流域）的相互作用进行了评估，以确定缓解干旱和洪水影响的水库运行方案。为此，首先，基于流量可变性的允许范围的概念得出流量可变性模式。其次，采用移动平均线移动法来评估储层对流量变化的影响。最后，运用网络理论和数据挖掘技术建立了上，下游水库之间的水流关系。结果表明，梯级水库在时间和空间上重塑了珠江的水流变化规律，并对下游径流产生累积影响。建成的网络和确定的运行方案表明，这种影响主要受到上游临界水库的流入量和存储量不同的影响。这表明水库在缓解干旱和防洪方面的各种作用限制了多水库系统综合运行策略的制定和应用。结果表明，梯级水库在时间和空间上重塑了珠江的水流变化规律，并对下游径流产生累积影响。建成的网络和确定的运行方案表明，这种影响主要受到上游临界水库的流入量和存储量不同的影响。这表明水库在减轻干旱和防洪方面的各种作用限制了多水库系统综合运行策略的制定和应用。结果表明，梯级水库在时间和空间上重塑了珠江的水流变化规律，并对下游径流产生累积影响。建成的网络和确定的运行方案表明，这种影响主要受到上游临界水库的流入量和存储量不同的影响。这表明水库在减轻干旱和防洪方面的各种作用限制了多水库系统综合运行策略的制定和应用。建成的网络和确定的运行方案表明，这种影响主要受到上游临界水库的流入量和存储量不同的影响。这表明水库在减轻干旱和防洪方面的各种作用限制了多水库系统综合运行策略的制定和应用。建成的网络和确定的运行方案表明，这种影响主要受到上游临界水库的流入量和存储量不同的影响。这表明水库在缓解干旱和防洪方面的各种作用限制了多水库系统综合运行策略的制定和应用。