複合式保護工與套管式離岸風機基座結合之沖刷現象

Scour around the Jacket Type Offshore Wind Turbine Foundation with the Composite Protection

陳信宏(Hsin-Hung Chen) ； 李建緯(Jian-Wei Li) ； 楊瑞源(Ray-Yeng Yang) ； 黃煌煇(Hwung-Hweng Hwung)

《海洋工程學刊》 14卷2期 (2014/06) Pp. 77-92

https://doi.org/10.6266/JCOE.2014.1402.01

摘要

本文主旨為利用試驗研究套管式離岸風機基座在水下受波、流影響下，基礎周遭所受的沖刷情形；並且搭配使用近岸養殖結構－箱網結構於迎流面、迎波面下，比較有無箱網結構為保護工下，基礎周遭地形沖刷情形的差異。本研究水工模型試驗於國立成功大學水工試驗所平面水槽進行，試驗首先進行水動力試驗探討箱網位置及箱網網衣長度的不同，對於流速的減緩與波高降低之影響，試驗結果找出最佳箱網條件為箱網放置於離岸風機基座迎流面及迎波面前2倍基座寬度距離，配合3/4水深之網衣長度。再根據上述試驗之最佳箱網條件布置，進行平面地形沖刷試驗，探討有無箱網下離岸風機基座周圍地形沖刷之差異，達到抗沖刷效用及保護基座之目的。

關鍵字

保護工 ； 箱網 ； 水工模型試驗 ； 套管式離岸風機基座

並列摘要

The objective of this study is to investigate the suitable method for the integration of coastal cage net and the offshore wind farm as scour protection. Physical model tests with the scale of 1:36 are carried out in the Near-shore Wave Basin (NSWB) at Tainan Hydraulics Laboratory (THL) with the jacket type foundation and the combination of coastal cage net in the test area. The location in water depth 16 m of the foundation is simulated in this study. From the fixed-bed experimental results, it shows that the up-current optimum location of coastal cage net in front of jacket type foundation can have a good effect to reduce current speed under the condition of distance between cage net and foundation being 2 times foundation width. However, the up-wave location of coastal cage net in front of jacket foundation, the wave attenuation effect near wind turbine foundation is not so obvious. From the fixed-bed experimental results, the optimum cage net depth is up to 0.75 water depth (12 m cage net depth in-situ) for reducing current speed. After the fixed-bed experimental tests, the mobile experimental study on soft scour protection for the jacket type foundation of offshore wind turbine is further conducted.

並列關鍵字

scour protection ； cage net ； physical model ； jacket type foundation