海底電纜沖刷的物理模型

Abstract

台灣是一個海島國家，由於陸地的空間資源有限，因此海洋空間的利用與發展尤為重要，近年來隨著海上風力發電的發展，海底電纜在沿海和近海工程中的重要性而受到廣泛的研究。當海底電纜暴露於直接水流作用時，電纜周圍會產生沖刷，這導致電纜的自由跨度懸空，增加應力和結構疲勞，因此研究海底電纜的沖刷行為有著其重要的意義。 對於電纜沖刷涉及波-海床-管線互制行為，我們試圖透過水槽實驗僅透過波浪來研究此類行為，實驗中我們利用不同的波浪角度，水深及埋深來對電纜進行沖刷，將實驗中產生的沖刷坑和沙丘紋利用石膏固定形狀，並利用Agisoft metashape standard進行近景攝影建立點雲，且使用cloud compare分析造成沖刷坑的深度及形狀。試圖去了解波浪角度對沖刷造成的影響。

Taiwan is an island country with limited land resources, hence it is crucial to develop and utilize the surrounding maritime space. In recent years, with the on-going construction of offshore wind power generation, the performance of submarine cables is of great concern. When submarine cables are exposed to ocean waves and currents, scouring may occur around the cables, which may lead to dangling, increase in stress and structural fatigue of the cables. Therefore, studying the scouring behavior of submarine cables holds significant importance. In this research, a series of flume experiments were performed to study the interaction between seabed sediment, pipe and wave action. In the tests, influence of the orientation of the pipe relative to the direction of the wave, water depth and burial depth of the pipe on scouring was examined. After the wave actions ceased, gypsum power was poured onto the surface of the sediment to stabilize the size and shape of the scour holes. As the gypsum solidified, close-range photogrammetry modeling was performed on the gypsum model to obtain 3D digital models and analyze the geometry of the scouring.