岛礁波浪环境下浮式结构物的动响应预报

Prediction of dynamic responses of floating structures under wave environment near islands and reefs

中国南海海洋岛礁往往都环绕着宽度数百到数千米、水深很浅的珊瑚礁盘,这些礁盘不仅具有丰富的渔业和旅游资源,而且发挥着消波、护岛的重要作用。为开发海洋资源,可以在岛礁附近布设各种浮体结构物,作为海洋开发、渔业生产、环境旅游等综合保障基地。对于岛礁附近的浮式结构物,其动响应特征必将受到周围复杂的近岛礁海洋环境的影响。文章采用缓坡方程考虑近岛礁波浪环境影响,以半潜式平台为研究对象,开创性地提出了一种工程简化计算方法,用于预报岛礁附近浮式结构物在波浪中的运动与载荷响应,为后续岛礁中型浮体的设计和安全性评估提供了分析手段。

The islands in South China Sea are usually encircled by coral table reefs which play an impor-tant role in wave absorbing and protecting islands. Fishing and tourism resources are abundant near the coral reefs, stretching with hundreds to thousands meters in shallow water. The floating structures can be disposed near the islands and reefs as comprehensive support bases for ocean development, fishery production and tourism. The responses of the floating structures will be influenced by the complex ocean environment near islands and reefs. Taking the example of a semi-submersible platform, the influence of ocean waves near islands and reefs is considered based on the mild-slope equation. A simplified engineering method is orig-inally proposed to predict the motion and load of floating structures near islands and reefs, which can be used in the design and safety assessment of floating structures near islands and reefs.