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首页> 外文期刊>Ocean & coastal management >Shoreline evolution related to coastal development of a managed beach in Alghero, Sardinia, Italy
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Shoreline evolution related to coastal development of a managed beach in Alghero, Sardinia, Italy

机译：与意大利撒丁岛阿尔盖罗受管理海滩的沿海开发相关的海岸线演变

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摘要

This work investigates the shoreline changes affecting the beaches between the resort towns of Alghero and Fertilia, on the northwest coast of Sardinia, Italy, following recent planned expansion and dredging of the main harbours. A thirty-year historical shoreline time-series and sediment grain-size changes along the beach are analysed, in order to obtain recent evidence of erosional/accretional trends. Shoreline position change rates are quantified and discussed in relation to the history of coastal development and to Posidonia oceanica seagrass litter management. This study shows that, as a whole, the sediment budget of the beach is maintained, and the total area of shoreline accretion is slightly larger than the area of retreat. However over 60% of the total 4 670 m of shoreline is retreating, mainly in the most valuable sectors of the littoral for stakeholders. The shoreline in the areas closest to the two harbour breakwaters, which were extended during the 1980s, is advancing at a rate of up to 2.8 m yr~(-1). Areas closer to the seawall of Punta del Paru are retreating, at a rate of up to 1 m yr~(-1), and the nearby dune fields are eroding. The natural dunes at Maria Pia beach are acting as a source of sand to the littoral. The use of beach-cast seagrass materials for coastal protection is widely recognised in Sardinia. This study highlights that the choice of locations for seagrass debris dumping is extremely important, particularly in a closed, largely urbanised, sedimentary system.
机译：在最近计划扩建和疏planned主要港口之后，这项工作调查了影响意大利撒丁岛西北海岸的阿尔盖罗（Alghero）和费蒂利亚（Fertilia）度假小镇之间的海滩的海岸线变化。为了获得侵蚀/增生趋势的最新证据，分析了三十年的历史海岸线时间序列和沿海滩的沉积物粒径变化。海岸线位置变化率的量化和讨论与沿海地区的发展史以及波西多尼亚大洋洲海草垫料管理有关。这项研究表明，总体而言，海滩的沉积物预算得以维持，海岸线增加的总面积略大于撤退的面积。但是，在总计4 670 m的海岸线中，超过60％的地区正在撤退，主要是在沿海地区对利益相关者最有价值的地区。最靠近两个港口防波堤的地区的海岸线在1980年代延伸，其前进速度高达2.8 m yr〜（-1）。距蓬塔帕鲁（Punta del Paru）海堤较近的区域正在以最大1 m yr〜（-1）的速度退缩，附近的沙丘场正在侵蚀。玛丽亚·皮亚（Maria Pia）海滩上的天然沙丘是沿海地区的沙子来源。撒丁岛广泛认可将海滩浇铸的海草材料用于海岸保护。这项研究强调，海草残渣倾倒地点的选择非常重要，特别是在封闭的，很大程度上城市化的沉积系统中。

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  • 来源
    《Ocean & coastal management》 |2013年第ptaa期|65-76|共12页
  • 作者

    Eleonora Manca; Vincenzo Pascucci; Mario Deluca; Andrea Cossu; Stefano Andreucci;

  • 作者单位

    Dipartimento di Scienze della Natura e del Territorio, Universita di Sassari, Via Piandanna 4, 07100 Sassari, Italy;

    Dipartimento di Scienze della Natura e del Territorio, Universita di Sassari, Via Piandanna 4, 07100 Sassari, Italy;

    Dipartimento di Scienze della Natura e del Territorio, Universita di Sassari, Via Piandanna 4, 07100 Sassari, Italy;

    Dipartimento di Scienze della Natura e del Territorio, Universita di Sassari, Via Piandanna 4, 07100 Sassari, Italy;

    Dipartimento di Scienze della Natura e del Territorio, Universita di Sassari, Via Piandanna 4, 07100 Sassari, Italy;

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