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首页> 外文会议>International Conference on Offshore Mechanics and Arctic Engineering, Jun 23-28, 2002, Oslo, Norway >MORPHOLOGY AND PIPELINE DESIGN THROUGH A DYNAMIC LANDFALL AREA THE BLACK SEA PIPELINE CASE
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MORPHOLOGY AND PIPELINE DESIGN THROUGH A DYNAMIC LANDFALL AREA THE BLACK SEA PIPELINE CASE

机译：通过动态降落区域的海底管道案例进行形态学和管道设计

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摘要

The Blue Stream pipeline project is a gas transportation system for the delivery of processed gas from a gas station in the southern Russia across the Black Sea to Ankara, Turkey. The Turkish landfall of the offshore pipeline in the Black Sea is located near Samsun, see Figure 1 for the pipeline route. One of the main aspects of the design of pipeline through a morphologically dynamic area such as landfall is the required burial depth (Chen et al, 1998, 2001 and Bijker et al 1995). The burial depth is the result of an optimisation between: 1. safety of the pipeline (which often requires a large burial depth), and 2. environmental impact and trenching costs (a small burial depth means less dredging and less environmental impact). This paper presents a method of predicting the future extremely low seabed level in a morphologically dynamic landfall area, which is required to determine the burial depth of the pipeline. Both short term and long term coast evolution were assessed to quantify the expected lowest seabed level along the pipeline route in the landfall area during the pipeline lifetime of 50 years. The results were used to determine the required pipeline burial depth. The long term morphological changes originate from long term variations in the morphological system (e.g. river input), gradient in the longshore sediment transport and long term variations in the hydrodynamic conditions. The short-term morphological changes originate from beach profile variations due to cross-shore sediment transport as a result of seasonal and yearly variations in the wave and current conditions. Numerical modelling was applied to compute the longshore and cross-shore sediment transport rates and the resulting coastline evolution and cross-shore profile evolution. The longshore transport model was validated using the available data on the coastline changes in the past 20 years, which was derived from the satellite images. The 50-year lowest seabed level has been determined as the sum of the coastline retreat and the cross-shore evolution in the next 50 years.
机译：Blue Stream管道项目是一种天然气运输系统，用于将处理过的天然气从俄罗斯南部的加油站穿过黑海输送到土耳其的安卡拉。土耳其在黑海中海上管道的登陆点位于Samsun附近，管道路线见图1。通过形态动态区域（例如登陆）的管道设计的主要方面之一是所需的埋藏深度（Chen等，1998，2001和Bijker等，1995）。掩埋深度是以下各项之间优化的结果：1.管道安全（通常需要较大的掩埋深度），以及2.环境影响和挖沟成本（较小的掩埋深度意味着较少的挖泥和较小的环境影响）。本文提出了一种预测形态动态登陆区未来极低海床水位的方法，这是确定管道埋藏深度所必需的。评估了短期和长期海岸演变，以量化在50年的管道寿命中，登陆区沿管道路线的预期最低海床水平。结果用于确定所需的管道埋深。长期形态变化源于形态系统的长期变化（例如河流输入），沿岸沉积物运移的梯度以及水动力条件的长期变化。短期形态变化是由于波浪和当前状况的季节性和年度变化而导致的跨岸沉积物迁移导致海滩剖面变化所致。数值模拟被用来计算长岸和跨岸沉积物的输送速度，以及由此产生的海岸线演变和跨岸剖面演变。使用从卫星图像获得的过去20年中海岸线变化的可用数据对长岸运输模型进行了验证。 50年最低海床水平已确定为海岸线退缩和未来50年跨岸演变的总和。

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