长江口九段沙分流计算模式及工程应用

Calculation method for stream passing around the Jiuduan sandbank in the river mouth of Yangtze River

本文根据流体运动的最小阻力原理 ,研究了长江口九段沙的分流 ,导出了它发育长度的理论公式 ,这一公式的建立加深了对该河段河床演变规律的认识 .文中计算了 1998年南、北槽的分流比 ,预测了长江口深水航道整治工程一、二、三期及远景规划实施后 ,北槽在正常条件下的分流比 ,以及当丁坝间淤满时的最小分流比 ,这些计算值和预测值均有一定的精度 .对深水航道治理的研究来说 。

Based upon the principle of least resistance,the stream passing around the Jiuduan sandbank is studied theoretically and the formula for predicting the development of the bank is derived.By using this formula,the evolution process of related river section is further analyzed.The calculation method is applied to predict the flow ratios between two branches around the sandbank is different stages of river regulation work and its validity is verified by the data of flow measurement.