Abstract Based on wave measurements lasting four and a half years, wave characteristics in a lagoon of the South China Sea are discussed in this paper. The significant wave height (Hs), mean periods (Tz) and wind speed (Ws) are mostly smaller than 1 m, 6 s and 15 m/s, respectively. Based on the monthly average Hs, there exists a transition season between winter and summer in the first half of the year. Waves of the transition season are very small, which is helpful for fishing and tourism. To characterize the seasonal cycle of wind and waves, a monsoon index based on the Hs and the wind direction (Wd) is proposed. It is verified by the monthly average air temperature. Finally, waves of winter (monsoon indexes

中文翻译：

---

南海某泻湖内波浪特征

摘要 本文基于历时四年半的波浪测量，讨论了南海某泻湖的波浪特征。有效波高（Hs）、平均周期（Tz）和风速（Ws）分别小于1 m、6 s和15 m/s。根据月平均 Hs，上半年存在冬夏过渡季节。过渡季节的波浪很小，有利于渔业和旅游。为了表征风浪的季节性周期，提出了基于 Hs 和风向 (Wd) 的季风指数。它通过月平均气温进行验证。最后，冬天的波浪（季风指数