Commercial fisheries interactions with oil and gas pipelines in the North Sea: considerations for decommissioning
Commercial fisheries interactions with oil and gas pipelines in the North Sea: considerations for decommissioning
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商业渔业与北海石油和天然气管道的相互作用：退役的考虑因素
DOI：
10.1093/icesjms/fsx121
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发表时间：
2018
影响因子：
3.3
通讯作者：
Rouse S
中科院分区：
文献类型：
--
作者：
Rouse S
商业渔业和石油和天然气开采在北海都是空间广泛的产业，在这两个活动重合的地方不可避免地存在物理上的相互作用。渔具和管道之间的频繁接触可能会危及管道的完整性，并可能导致渔具卡住。人们还知道，坊间传闻，一些船只以管道为目标，可能受益于当地的人工鱼礁效应。管道退役选择(拆除还是就地)对商业渔业的影响必须作为同意程序的一部分进行评估，但在NS中，两者之间的相互作用程度目前尚不清楚。苏格兰海底船队的船舶监测系统(VMS)数据与管道上的空间数据进行了分析。在5年的时间里，大约三分之一(36.1%)的行程在管道200米范围内捕捞，这表明管道经常与渔具相互作用。与管道有关的捕捞努力(以小时计)占总努力的2.52%，而在1 公里以外的同等海底区域，这一比例为1.33%，这意味着管道周围的捕鱼活动适度聚集。只有一小部分(0.93%)的捕鱼行程积极将管道作为渔场。管道周围捕捞活动的最高水平发生在西北地区。具有100 h打捞的管道段通常是直径较大的管道。结果表明，对于商业渔业来说，管道退役可能既有消极的结果(总努力的转移)，也可能有积极的结果(减少捕捞潜力)。建议在很少或根本没有与管道有关的捕捞活动的情况下，在选择退役战略时，应优先考虑捕捞以外的接收器。此外，应使用管道周围的捕捞强度来告知对任何留在原地的管道进行退役后完整性监测的频率。
Commercial fisheries and oil and gas extraction are both spatially extensive industries in the North Sea (NS), and inevitably there is physical interaction where the two activities coincide. Regular contact between fishing gear and pipelines may risk pipeline integrity and could lead to gear snagging. It is also known, anecdotally, that some vessels target pipelines, potentially benefiting from local artificial reef effects. The impacts of pipeline decommissioning options (removal vs.in situ) on commercial fisheries must be evaluated as part of the consenting process, but the degree of interaction between the two is presently unknown in the NS. Vessel Monitoring System (VMS) data for the Scottish demersal fleet were analysed with spatial data on pipelines. Approximately one-third (36.1%) of trips fished within 200 m of a pipeline over a 5-year period, suggesting that pipelines are subjected to regular interaction with fishing gear. The fishing effort (in hours) associated with pipelines was 2.52% of the total effort, compared to 1.33% in an equivalent area of seabed 1 km away, implying modest aggregation of fishing around pipelines. Only a small percentage (0.93%) of fishing trips actively targeted pipelines as fishing grounds. The highest level of fishing around pipelines occurred in the northeast NS. Pipeline sections with >100 h of fishing were typically larger diameter pipelines. The results suggest that pipeline decommissioning may have both negative (displacement of aggregated effort) and positive (reduced snagging potential) outcomes for commercial fisheries. It is recommended that where there is little or no fishing activity associated with pipelines, receptors other than fishing should be prioritized when selecting decommissioning strategies. Additionally, the intensity of fishing around pipelines should be used to inform the frequency of post-decommissioning integrity monitoring for any pipelines leftin situ.
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