Impact of different operating modes for a Severn Barrage on the tidal power and flood inundation in the Severn Estuary, UK
Impact of different operating modes for a Severn Barrage on the tidal power and flood inundation in the Severn Estuary, UK
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DOI：
10.1016/j.apenergy.2009.11.024
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发表时间：
2010-07
期刊：
影响因子：
11.2
通讯作者：
J. Xia;R. Falconer;B. Lin
中科院分区：
文献类型：
--
作者：
J. Xia;R. Falconer;B. Lin
塞文河口的大潮潮差接近14米，被认为是世界上潮差最高的河口之一。关于在河口建造一个潮汐拦河坝，以提取潮汐能，已经提出了各种建议。最初由塞文潮汐发电集团（STPG）提出的拦河坝方案，如果按照提议建造，将成为世界上最大的潮汐发电项目。因此，研究该闸不同运行方式对河口潮流发电量和洪水淹没范围的影响具有重要意义。在本文中，一个现有的二维水动力模型的基础上，非结构化三角形网格已被集成与一个新的算法开发的潮汐发电量的估计，它可以占三个拦河坝运行模式，包括落潮发电，洪水发电，和双向发电。改进后的模型被用来调查不同的拦河坝运行模式的潮汐发电量和相关的塞文口沿着的洪水淹没程度的影响。预测结果表明，发电方式产生的电能最少，但对拦河坝上游最高水位的影响较大。双向发电将改善这些条件，并产生与退潮发电相当的电量，装机容量低，潮间带损失小。因此，退潮发电或双向发电模式似乎是发电的首选方案，因为两者都可以提供可接受的电能和减少洪水风险的好处。
The Severn Estuary has a spring tidal range approaching 14m and is regarded as having one of the highest tidal ranges in the world. Various proposals have been made regarding the construction of a tidal barrage across the estuary to enable tidal energy to be extracted. The barrage scheme originally proposed by the Severn Tidal Power Group (STPG) would be the largest project for tidal power generation in the world if built as proposed. Therefore, it is important to study the impact of different operating modes for this barrage on the tidal power output and flood inundation extent in the estuary. In this paper, an existing two-dimensional hydrodynamic model based on an unstructured triangular mesh has been integrated with a new algorithm developed for the estimation of tidal power output, which can account for three barrage operating modes, including ebb generation, flood generation, and two-way generation. The refined model was then used to investigate the impact of different barrage operating modes on the tidal power output and the associated extent of flood inundation along the Severn Estuary. Predicted results indicate that the mode of flood generation would produce the least electrical energy and cause a larger reduction in the maximum water levels upstream of the barrage. Two-way generation would provide an improvement to these conditions, and produce an equivalent amount of electricity to that from ebb generation, with a low installed capacity and a small loss of intertidal zones. Therefore, the mode of ebb generation or two-way generation would appear to be a preferred option for power generation, because both would offer benefits of acceptable electrical energy and reduced flood risk.