感潮河道平面二维水流数学模型建立与验证

Establishment and Verification of 2-D flow Model of Tidal Channel

水流受潮汐影响明显的地区,在径流和潮流的共同作用下水流、泥沙的运动规律十分复杂。文中采用不规则三角形单元计算网格,运用有限元理论的数值计算方法,建立起二维水流数学模型。根据实测地形、水文资料,将所建模型应用于福建省闽江下游感潮河道淮安-亭江河段,对该河道的水流运动状况进行了模拟,并通过实测潮位和流速验证,结果表明模型能很好再现在径流和潮汐双重作用下的水流运动特征,模型的精度能满足工程实践的要求。本研究成果为后期进行泥沙数值模拟和航道整治工程数值模型研究提供了良好的基础。

In areas where the flow is significantly affected by the tide,the law of flow and sediment is very complex under the combined action of flood and tide.In this paper,the irregular triangular element is used to calculate the mesh and the numerical method of the finite element theory is used to establish the two-dimensional flow mathematical model.According to the landform hydrological data,the model is applied in TingJiang HuaiAn Reach,tidal waterway of downstream of Minjiang river.By simulating this river’s flow,the flow movement behaviors under the effect of runoff and tidal can be reproduced perfectly.It provides a good foundation for the study of the numerical simulation of sediment and the numerical model of waterway regulation project.