纵荡（surge）是指浸于水中的物体沿最长延展方向的水平线性振荡运动。如果该物体(如轴对称物体)无最长的水平延展方向，则规定纵荡运动方向为入射波方向。浸于水中的物体沿垂直方向的线性振荡运动称为“垂荡”，沿垂直于纵荡运动方向的水平线性振荡运动称为“横荡”。
计算结果表明，波浪的二阶作用对浮式塔的低频纵荡有影响。
The results show that the second order wave force has an effect on the slow oscillation of the floating tower in surge direction.
经过计算分析，发现在入射波频率很低且接近张力腿平台纵荡固有频率时，平台将会产生很大位移。
Through analysis to the surge response, we can find that when the frequency of the incident wave is too low to the inhered surge frequency of TLP, very big displacement will take place.
文中还讨论了运动响应的非线性问题，最后对在生存海况下估算张力式平台纵荡及横荡的方法提出了看法。
The paper discusses the nonlinear problem of motion response as well as methods for predicting surge and sway of TLP in survival conditions.
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