流团模型在洪水计算中的应用

作者在已论证平面二维Ｌ－Ｅ法可行性的基础上，对水流计算模型作了进一步简化，即提出将牛顿第地运动定律直接作用于各个流体质团来获得整体流动规律，并给出其基本方程与相应的数值处理方法，经过１９５４年荆江分共沤实际洪水过程的检验，并通过对１９５４年型百年一遇洪水过程的预测，均证实了该流团模型计算类似分洪区洪水问题的合理性与可靠性，可用于分洪过程及洪水演进的预报。

The Calculation of Flood Flow by Fluid Particle Model

Having documented the feasibility of the horizontal 2-D L-E method formally presented, the authors further put forward a simplified numerical model for simulating flood flow. In this paper,the total fluid is considered an assembly of many fluid particles, upon each of which various forces are imposed according to the Second Newtonian Universal Law. The relevant basic equations and numerical procedures are developed so that the whole flow characteristics of the computation system can be obtained. This fluid particle model has been verified by observed data of 1954 flood in the Jingjiang River Flood-diversion Area and has been successfully applied to simulate the flood diversion process of corresponding 1954 (p = 1%) flood in the same area. Both results demonstrate the reasonableness and reliability of this numerical model in dealing with complicated flood flow problems. Thus the fluid particle model can provide a useful tool to predict the possible flood-diversion process as well as flood development in practical fields.