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An analysis of subaerial beach rotation and influences of environmental forcing adjacent to the proposed Swansea Bay Tidal Lagoon

机译:拟议的斯旺西湾潮汐泻湖附近的空中海滩旋转和环境强迫的影响分析

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Beach Profiles surveys and gale climate data were utilised to assess medium timescale beach rotation at four beaches located along the shores of a crenulated embayment within Swansea Bay, Southwest Wales. The proposed Tidal Lagoon is located within this Bay. Results identified a 7 year (1998-2005) record of cyclic summer/winter rotation and a 14 year (1999-2013) record of annual rotation within the subaerial zone on all four assessed beaches. In the absence of headlands to trap sediment it is asserted that the driving force for beach rotation is the presence of Swansea Dockland/Tawe dredged channel complex, Port Talbot Harbour and the Neath dredged channel which form surrogate headlands essentially creating four separate beach systems through restricting sediment by-pass. Seasonal averaged wind and wave variables showed differing correlation with volume changes and cross-correlation results showed that volume variation lagged behind forcing variables by up to six months (i.e. the resolution of the data). This was confirmed by the annually averaged results which showed only subtle correlation. Here volume change in most cases lagged forcing variables by less than one year. Based on correlations, wind direction variability follows closely with volume changes but wind speed, wave period and height are generally opposite. Initial results suggest that the proposed Swansea Bay Tidal Lagoon, located between sediment cells and surrogate headlands, would have little negative effect on subaerial coastal processes. These datasets will be used as a benchmark for monitoring prior to, during and post construction, with results being used to update and inform subsequent strategies. (C) 2015 Elsevier Ltd. All rights reserved.
机译:利用“海滩概况”调查和大风气候数据来评估位于西南威尔士斯旺西湾沿锯齿状堤岸沿岸的四个海滩的中等时标海滩旋转。拟议的潮汐泻湖位于该海湾内。结果确定,在所有四个评估海滩上,地下和地下环年轮换的7年(1998-2005年)记录和年度轮换14年(1999-2013年)记录。在没有岬角捕集沉积物的情况下,据称造成海滩旋转的动力是斯旺西港区/塔威疏dr河道综合体,塔尔伯特港港口和奈思疏channel河道的存在,它们形成了替代岬角,通过限制形成了四个独立的海滩系统。沉积物旁路。季节平均风和浪变量显示出与体积变化的相关性不同,互相关结果表明体积变化滞后于强迫变量最多六个月(即数据的分辨率)。年度平均结果证实了这一点,该结果仅显示出细微的相关性。在大多数情况下,此处的体积变化与强迫变量相比滞后了不到一年。基于相关性,风向的可变性随体积的变化密切相关,但风速,波浪周期和高度通常相反。初步结果表明,拟议的斯旺西湾潮汐泻湖位于沉积物细胞与替代岬角之间,对航空沿海过程几乎没有负面影响。这些数据集将用作构建前,构建中和构建后监控的基准,结果将用于更新和告知后续策略。 (C)2015 Elsevier Ltd.保留所有权利。

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