一、引言近年来,在物理湖泊学研究中,为探讨湖泊水动力学过程形成的物理机制,预测各种水文气象条件,包括极端条件作用下形成的水动力学过程,研究者们常采用数值模拟的研究方法。它也是湖泊中污染物扩散、泥沙冲淤、水质变化等的数值研究的重要基础。太湖及日本琵琶湖南湖均属浅水湖泊。关于琵琶湖已做了大量研究工作。通过大量观测分析、物理模型模拟和数值研究,已基本弄清了琵琶湖北湖冬季和夏季环流的特征及其形成机制。但对琵琶湖南湖湖流的数值研究开展得较少。目前,为了建立南湖透明 I. INTRODUCTION In recent years, in the study of physical lake, in order to discuss the physical mechanism of lake hydrodynamic process formation and predict various hydro-meteorological conditions, including the hydrodynamic process formed under extreme conditions, researchers often use numerical Simulation of research methods. It is also an important foundation for the numerical study of the diffusion of pollutants in the lake, sediment scouring and silting, water quality change and so on. Taihu Lake and Lake Biwa in China are shallow lakes. Much research has been done on Lake Biwa. Through a large number of observation and analysis, physical model simulation and numerical study, the characteristics and formation mechanism of winter and summer circulation over the north lake in Pipa Lake have been basically clarified. However, numerical studies on the flow of Lake Baihu Lake in Hunan Province have been carried out less. At present, in order to establish a transparent South Lake