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Scour Beneath and Adjacent to Submarine Pipelines with Spoilers on a Cohesive Seabed: Case Study of Hangzhou Bay, China
| 题名： | Scour Beneath and Adjacent to Submarine Pipelines with Spoilers on a Cohesive Seabed: Case Study of Hangzhou Bay, China |
| 正文语种： | 英文 |
| 作者： | Lijun Zhu1; Kaiping Liu2; Hongxia Fan3; Shuang Cao4; Huai Chen5; Jianzhong Wang6; Zhihuan Wang7 |
| 作者单位： | 1Professor, State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China. 2Professor, Lower Reach Bureau of Hydrology, Changjiang Water Resources Commission, Nanjing 210011, China. 3Associate Professor, State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China. Email: hxfan@nhri.cn 4Associate Professor, Changjiang Water Resources Commission, Lower Reach Bureau of Hydrology, Nanjing 210011, China. 5Engineer, State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China (corresponding author). 6Professor, State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China. 7Ph.D. Student, State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China. |
| 关键词： | Submarine pipeline; Spoiler; Cohesive seabed; Hangzhou Bay |
| 摘要： | This study focused on scour beneath and adjacent to submarine pipelines with spoilers on a cohesive seabed. Field data about the seabed bathymetry and seabed subbottom imagery along the pipeline length direction in the Hangzhou Bay, China were collected between 2005 and 2016 for analysis. Results showed that during the last 12 years, self-buried pipelines increased from 40 to 90%; while distributions of scour pits changed randomly with time. Statistical parameters (depth and length of free span) of the scour pits beneath the pipeline in this study were roughly consistent with the values published in previous studies. However, scour adjacent to pipelines was different from that beneath pipelines in that it was much larger, and the formation of it was related to the erosion of the silt loam of the seabed. Three factors (decreased sediment supply, seabed scouring, and installation of spoilers), which probably led to the scouring, were investigated. Sediment supply to the Hangzhou Bay was reduced remarkably during the last 30 years, and the decrease of sediment load in the Yangtze River was the primary cause. In the Hangzhou Bay, the seabed near deep channels was continuously eroded, and the extent of erosion near the pipelines was the largest. Spoilers on pipelines could increase the degree of local turbulence and stimulate the suspension and transportation of sediment. Under the measured spring tidal current condition, the dimensionless scour depth calculated by Goncharov’s equation was relatively large; for example, the 273.1-mm (10.75-in.) diameter pipeline as an example, it was in the range of 0.33–2.49. According to the easily erodible property of silt loam, a hypothesis about the random distribution of scour pits was presented. |
| 出版年： | 2019 |
| 期刊名称： | Journal of Waterway, Port, Coastal, and Ocean Engineering |
| 卷： | 145 |
| 期： | 1 |
| 页码： | 1-13 |
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