数值模拟在钱塘江涌潮分析中的应用──Ⅰ.数值计算方法

THE APPLICATION OF NUMERICAL SIMULATION IN ANALYSIS OF QIANTANGJIANG TIDE──Ⅰ. NUMERICAL METHOD

摘要

摘要:利用数值模拟的方法对钱塘江涌潮从杭州湾口开始形成、发展直至消失的全过程进行了深入全面的描写．从杭州湾口到钱塘江出口，采用二维圣维南浅水波方程描述水波的运动，而在钱塘江河内采用一维圣维南浅水波方程描写涌潮的发展过程．详细描述用于一维和二维圣维南方程计算钱塘江涌潮的数值计算方法，首次把无结构网格上的NND格式应用于求解二维圣维南方程，并给出了详细的推导过程．对上下游水边界分别采用无反射边界条件和特征线方法，而对于动边界问题本文也给出了相应的处理方法．

Abstract:The full description of the formation, development and disappear of Qiantangjiangtide by numerical method is presented in this paper in details. In Hangzhou Gulf(near Ganpu),the water region is very wide and the water wave movement are two dimensional, then the two dimensional Saint--Venant equations are used to discribe the movement of waterwave from HangzhouGulf to estuary of Qiantangjiang River (Yanguan). In the Qiantangjiang River (before Yanguan),the water region is narrow and the river is very long, t...