本文關(guān)鍵詞： 海底管線 沖刷 斜坡海床 斜向波　出處：《海洋學報》2016年07期 　論文類型：期刊論文

【摘要】：由于海床起伏不平,斜坡的存在必然改變波浪對管線及海床的作用特性,進而影響管線三維沖刷�；诓ɡ烁鄢貙嶒�,考慮規(guī)則波的作用,采用中值粒徑為0.22mm的原型沙鋪設(shè)與波浪傳播方向成45°夾角的斜坡,研究斜向波作用下斜坡上海底管線的三維沖刷特性。通過測量管線下方?jīng)_刷坑寬度和深度的差異,分析管線三維沖刷的不均衡性。實驗表明:管線的存在使斜坡上的波高有所降低;斜向波作用下管線三維沖刷的不均衡性表現(xiàn)為深度不均衡性和寬度不均衡性,寬度不均衡性主要是管后淤積泥沙的后移引起的,周期對三維沖刷不均衡性的影響比波高對其的影響程度大;管線自深海向近岸延展時,隨水深的減小,沖刷深度分為緩慢發(fā)展階段和快速發(fā)展階段。
[Abstract]:Because of the undulation of the seabed, the existence of the slope will inevitably change the action characteristics of the wave on the pipeline and seabed, and then affect the three-dimensional scour of the pipeline. Based on the wave pool experiment, the effect of the regular wave is considered. The 3-D scour characteristics of submarine pipelines on a slope with a median diameter of 0.22 mm and a 45 擄angle of wave propagation direction are studied. The differences in width and depth of scour pits beneath the slope are measured. The experiment shows that the wave height on the slope is decreased due to the existence of pipeline, and that the depth and width of the three dimensional scour are not balanced under the action of oblique wave. The unbalance of width is mainly caused by the backward movement of silt in the back of the pipe, and the effect of the period on the three-dimensional scour is greater than that of the wave height, and when the pipeline extends from the deep sea to the near shore, it decreases with the depth of water. Scour depth is divided into slow development stage and rapid development stage.
【作者單位】： 長沙理工大學水利工程學院;水沙科學與水災害防治湖南省重點實驗室;
【基金】：國家自然科學基金資助項目(41176072,51309038) 湖南省自然科學基金項目(2015JJ2006)
【分類號】：P756.2;P731.2

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本文編號：1516567