An inverse reduced-gravity model is used to simulate the deep South China Sea (SCS) circulation. A set of experiments are conducted using this model to study the influence of the Luzon overflow through the two inlets on the deep circulation in the northern SCS. Model results suggest that the relative contribution of these inlets largely depends on the magnitude of the input transport of the overflow, but the northern inlet is more efficient than the southern inlet in driving the deep circulation in the northern SCS. When all of the Luzon overflow occurs through the northern inlet the deep circulation in the northern SCS is enhanced. Conversely, when all of the Luzon overflow occurs through the southern inlet the circulation in the northern SCS is weakened. A Lagrangian trajectory model is also developed and applied to these cases. The Lagrangian results indicate that the location of the Luzon overflow likely has impacts upon the sediment transport into the northern SCS.

反重力折减模型用于模拟南海深部环流。使用该模型进行了一组实验，以研究通过两个入口的吕宋溢流对南海北部深部环流的影响。模型结果表明，这些进水口的相对贡献在很大程度上取决于溢流输入输水的量，但北部进水口比南部进水口更能驱动北部SCS的深层循环。当所有吕宋溢流通过北部入口发生时，北部南海的深层环流就会增强。相反，当所有吕宋溢流都通过南部入口发生时，北部南海的环流就会减弱。拉格朗日轨迹模型也被开发并应用于这些情况。