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首页> 外文期刊>Estuarine Coastal and Shelf Science >Much damage for little advantage: Field studies and morphodynamic modelling highlight the environmental impact of an apparently minor coastal mismanagement
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Much damage for little advantage: Field studies and morphodynamic modelling highlight the environmental impact of an apparently minor coastal mismanagement

机译：损害严重，却无济于事：实地研究和形态动力学模型突显了沿海轻微管理不善对环境的影响

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摘要

While coastal management activities have long been known to exert a strong influence on the health of marine ecosystems, neither scientists nor administrators have realized that small interventions may lead to disproportionately larger impacts. This study investigated the broad and long-lasting environmental consequences of the construction of an ill-planned, although small (only 12 m long) jetty for pleasure crafts on the hydrodynamic conditions and on the meadow of the seagrass Posidonia oceanica of an embayed cove in the Ligurian Sea (NW Mediterranean). There, P. oceanica used to develop on a high (>1.5 m) matte (a lignified terrace causing seafloor elevation) in which the leaves reach the surface and form a compact natural barrier to waves in front of the beach. Such a so-called 'fringing reef of P. oceanica is today recognized of high ecological value and specific conservation efforts are required. The construction of the jetty implied the cutting of the matte, which directly destroyed part of the fringing reef. In addition, meadow mapping and sedimentological analyses coupled with morphodynamic modelling showed that the ecosystem of the whole cove had been greatly altered by the jetty. We used the geometric planform approach, a proper tool in the study of headland-controlled embayment, both to characterise the present situation of Prelo cove and to simulate the original one, before the jetty was built. In the long term, such a small jetty completely altered the configuration and the hydrodynamic conditions of the whole cove, splitting the original pocket beach into two smaller ones and creating strong rip-currents flowing seaward along the jetty. These rip-currents enhanced erosion of residual shallow portions of the meadow and further modified the sedimentary fluxes in shallow waters. A century after the construction of the jetty, an irreversible environmental damage has occurred, as the slow growing rate of P. oceanica implies that the high matte terrace and the fringing reef will hardly form again, even after the removal of the jetty. The lesson learnt from this study is that even such small, and therefore reputed intrinsically 'innocent', interventions on the coastal zone require accurate planning based on interdisciplinary studies to understand and respect the delicate interplay among morphological, hydrodynamic and ecological components.
机译：尽管人们早已知道沿海管理活动会对海洋生态系统的健康产生巨大影响，但科学家和管理人员都没有意识到小规模的干预可能会带来不成比例的更大影响。这项研究调查了在水动力条件下以及在一个被掩埋的海湾的海草波塞冬尼亚大洋洲的草地上，为游乐船只建造一个计划不周，虽然很小（只有12 m长）的跳船的计划，但该计划造成了广泛而持久的环境后果。利古里亚海（地中海西北部）。在那里，P。oceanica曾经在高（> 1.5 m）的磨砂（会引起海底升高的木质露台）上发育，叶片到达表面并形成了紧凑的天然屏障，可以阻挡海滩前的海浪。如今，这种所谓的“大洋洲边礁”被认为具有很高的生态价值，需要作出特殊的保护努力。码头的建设暗示着对亚光的切割，这直接破坏了边缘礁的一部分。此外，草甸制图和沉积学分析以及形态动力学模型表明，整个小海湾的生态系统已经被码头大大改变了。我们使用了几何平面形式方法，这是研究岬角控制的航向的合适工具，既可以表征普雷洛湾的现状，又可以模拟建造码头之前的原始洛洛湾。从长远来看，这么小的码头完全改变了整个海湾的构造和流体力学条件，将原始的口袋海滩分成两个较小的海滩，并产生了沿码头向海流动的强大裂隙流。这些裂隙流增强了草地剩余浅层部分的侵蚀，并进一步改变了浅水区的沉积通量。建造码头之后的一个世纪，发生了不可逆转的环境破坏，因为大洋白菜的缓慢生长意味着即使在拆除码头之后，高哑光阶地和边缘礁也很难再次形成。从这项研究中吸取的教训是，即使对沿海地区进行如此小规模的干预，也因此在本质上被称为“无害的”干预，也需要基于跨学科研究的准确计划，以理解并尊重形态，水动力和生态要素之间的微妙相互作用。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2011年第3期|p.255-262|共8页
  • 作者

    Roberta Lasagna; Monica Montefalcone; Giancarlo Albertelli; Nicola Corradi; Marco Ferrari; Carla Morri; Carlo Nike Bianchi;

  • 作者单位

    DipTeRis, Department for the Study of the Territory and its Resources, University of Genoa, Corso Europa 26, 16132 Genoa, Italy;

    DipTeRis, Department for the Study of the Territory and its Resources, University of Genoa, Corso Europa 26, 16132 Genoa, Italy;

    DipTeRis, Department for the Study of the Territory and its Resources, University of Genoa, Corso Europa 26, 16132 Genoa, Italy;

    DipTeRis, Department for the Study of the Territory and its Resources, University of Genoa, Corso Europa 26, 16132 Genoa, Italy;

    DipTeRis, Department for the Study of the Territory and its Resources, University of Genoa, Corso Europa 26, 16132 Genoa, Italy;

    DipTeRis, Department for the Study of the Territory and its Resources, University of Genoa, Corso Europa 26, 16132 Genoa, Italy;

    DipTeRis, Department for the Study of the Territory and its Resources, University of Genoa, Corso Europa 26, 16132 Genoa, Italy;

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  • 正文语种 eng
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  • 关键词

    seagrass; hydrodynamic conditions; coastal construction; geometric planform analysis; posidonia oceanica; mediterranean sea;

    机译：海草流体动力条件;沿海建设;几何平面分析;海洋波塞冬地中海;

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