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Pattern-regulated wave attenuation by salt marshes in the Yangtze Estuary, China

机译：中国长江河口盐沼的图案调节波衰减

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摘要

With the increase in coastal hazards induced by global change, estuarine deltas are urgently required to enhance nature-based coastal defenses. This study sets an example at the Nanhui nearshore salt marshes in the Yangtze Estuary, China, with a one-dimension wave attenuation empirical model and Landscape Resistance Index (LRI). We explored wave attenuation by salt marshes at site and transect scale, and put forward potential approaches to improve coastal defenses. Results showed that 1) the two 10 m-wide stripes of typical vegetation (Spartina alterniflora and Scirpus mariqueter) could attenuate wave height mostly when incident wave height was 0.22 m and 0.20 m, respectively; 2) under the condition of 0.6 m initial wave height, wave attenuation rate among all transects ranged from 32.50% to 98.30% (71.30 +/- 16.09% on average); and 3) Land cover-Position-Length weighted LRI was an effective indicator for the relationship between wave attenuation and landscape pattern. Wave attenuation by salt marshes differ in various environments and are species specific. Wave attenuation along transects was also affected by both land cover and spatial configuration. Thus, we proposed some salt marsh restoration strategies, such as preferential restoration of long transects, differentiation of vegetation configuration, and engineering protections like low levees or breakwaters in front of salt marsh edges. These findings could be used to promote ecological functions in the Yangtze Estuary and other coastal marshes in the world.
机译：随着全球变革引起的沿海危害的增加，迫切需要加强基于自然的沿海防御的河口Deltas。本研究在中国长江口南汇近岸盐沼的榜样，采用一维波衰减经验模型和景观阻力指数（LRI）。我们在现场盐沼探讨了波浪衰减，并提出了提高沿海防御的潜在方法。结果表明，1）两种典型植被（Spartina Interfireflora和Scirpus Maciquers）的两条宽条纹可以在入射波高度分别为0.22米和0.20米时大多衰减波高; 2）在0.6米的初始波高的条件下，所有横断面的波浪衰减率范围为32.50％至98.30％（平均71.30 +/- 16.09％）; 3）陆地覆盖定位长度加权LRI是波衰减与景观模式之间关系的有效指标。盐沼的波浪衰减在各种环境中不同，并且是特定的物种。横断面的波浪衰减也受到陆地覆盖和空间配置的影响。因此，我们提出了一些盐沼恢复策略，例如优先恢复长途横断波，植被配置的分化，以及盐沼边缘前的低滑堤或椎间面目的工程保护。这些调查结果可用于促进世界上长江河口和其他沿海沼泽的生态功能。

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  • 来源
    《Ocean & coastal management》 |2021年第8期|105686.1-105686.9|共9页
  • 作者

    Xue Liming; Li Xiuzhen; Shi Benwei; Yang Bin; Lin Shiwei; Yuan Yiquan; Ma Yuxi; Peng Zhong;

  • 作者单位

    East China Normal Univ Inst Ecochongming State Key Lab Estuarine & Coastal Res Shanghai 200241 Peoples R China;

    East China Normal Univ Inst Ecochongming State Key Lab Estuarine & Coastal Res Shanghai 200241 Peoples R China|Yangtze Delta Estuarine Wetland Ecosyst Observat Minist Educ Shanghai Peoples R China|Shanghai Sci & Technol Comm Shanghai Peoples R China;

    East China Normal Univ Inst Ecochongming State Key Lab Estuarine & Coastal Res Shanghai 200241 Peoples R China;

    East China Normal Univ Inst Ecochongming State Key Lab Estuarine & Coastal Res Shanghai 200241 Peoples R China;

    East China Normal Univ Inst Ecochongming State Key Lab Estuarine & Coastal Res Shanghai 200241 Peoples R China;

    East China Normal Univ Inst Ecochongming State Key Lab Estuarine & Coastal Res Shanghai 200241 Peoples R China;

    East China Normal Univ Inst Ecochongming State Key Lab Estuarine & Coastal Res Shanghai 200241 Peoples R China;

    East China Normal Univ Inst Ecochongming State Key Lab Estuarine & Coastal Res Shanghai 200241 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Landscape pattern; Wave attenuation; Coastal defenses; Salt marsh; Ecological function;

    机译：景观模式;波浪衰减;沿海防御;盐沼;生态功能;

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