A three-dimensional (3D) numerical model was developed to investigate the thermodynamic and sediment processes in a subtropical drinking water reservoir. Data-driven models were also established to generate the inflow conditions. The modelling outputs revealed that climatic forces such as storms and winds significantly impact lake stratification and mixing processes. The sediment transport is driven by storm events, during which sediment delivery to the reservoir is dominated by allochthonous flux. The sediments are transported from riverine zones to transition zones and finally to lacustrine zones. It is estimated that sediment accumulation could have reached 100,000 kg during the largest storm event in February 2015. The winds can lead to a strong vertical water cycle, especially at the centre of the reservoir, and strong winds result in bed erosion in shallow regions. The outcomes of this paper benefit future research by providing a modelling approach for understanding the hydrodynamics of lakes and reservoirs under a variable climate, and also the local water utility by providing insights for an improved management of the reservoir of this study.

建立了三维（3D）数值模型，以研究亚热带饮用水水库的热力学和沉积过程。还建立了数据驱动模型以生成流入条件。模拟输出表明，诸如风暴和风等气候力量会显着影响湖泊的分层和混合过程。沉积物的运输是由风暴事件驱动的，在此期间，沉积物向储层的输送主要受异源通量影响。沉积物从河流带运到过渡带，最后到湖泊带。据估计，在2015年2月的最大风暴事件中，沉积物堆积可能达到100,000千克。风会导致强烈的垂直水循环，尤其是在水库中心，强风导致浅层地区的河床侵蚀。本文的结果通过提供一种建模方法来理解可变气候下的湖泊和水库的水动力，并通过提供改进本研究的水库管理的见识，从而为当地的水利用提供了有益的未来研究。