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首页> 外文期刊>Estuarine Coastal and Shelf Science >Morphological impacts of the Chilean megathrust earthquake Mw 8.8 on coastal wetlands of high conservation value
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Morphological impacts of the Chilean megathrust earthquake Mw 8.8 on coastal wetlands of high conservation value

机译：智利巨大地震MW 8.8对高保价沿海湿地的形态学影响

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The subduction earthquake Mw = 8.8 on February 27th, 2010 which affected Chile's south-central coast (37 degrees S) produced a co-seismic uplift of similar to 1.4 m in coastal Tubul-Raqui wetland area, with abrupt morphological changes. In order to determine the magnitude of the changes, in this area of high conservation value, salt marsh morphological features were identified and quantified by mapping the changing extent of the coverage of morphological features before (2009) and after (2011-2012) the tectonic disturbance. Rectified satellite images of seven study sites were created for the three years using Google Earth images and processed in ArcGIS. The results indicate a total decline of 31.7% in the area of the morphological features and the emergence of 1.25 km(2) of dried area; salt pans and tidal creeks were severely affected, with more than 90% loss. In contrast, there was a slight recovery of the Tubul and Raqui main river channel (12%) and the tidal channels (8.5%) between 2011 and 2012, mainly in the area near the river mouth. The salt marsh (cover by Spartina densiflora) showed slight variation after the co-seismic uplift (14.6%), demonstrating high tolerance in the face of high-impact natural disturbances. The changes and later evolution may be explained mostly by the action of the seismic cycle in subduction zones. Continuing to monitor state of the recovery of the salt marsh and other similar environments may help to understand the true role that the seismic cycle plays in the dynamics of coastal ecosystems, as well as its incidence in the recovery process.
机译：俯冲地震MW = 8.8 2010年2月27日，影响智利的南部海岸（37摄氏度）在沿海管道湿地区的沿海管湿地地区产生了一个相似的与1.4米的隆起隆起。为了确定变化的大小，在该高保值的区域中，通过绘制（2009）之前和（2011-2012）之前的形态特征的覆盖范围的变化程度和（2011-2012）构造后鉴定和量化盐沼形态特征。骚乱。使用Google地球图像和在ArcGIS中处理的三年创建了七个学习网站的纠正卫星图像。结果表明，整体特征领域的总下降31.7％，干旱地区1.25公里（2）;盐盘和潮汐小溪受到严重影响，损失超过90％以上。相比之下，Tumul和Raqui主要河道（12％）和2011年间的潮汐通道（8.5％）略有恢复，主要是在河口附近的区域。盐沼（Spartina Densiflora封面）在共震隆起（14.6％）后显示出轻微的变化，在面对高撞击自然扰动方面展示了高耐受性。可以通过俯冲区域中的地震周期的动作来解释变化和后来的进化。继续监测盐沼和其他类似环境的恢复的状态可能有助于了解地震周期在沿海生态系统的动态中发挥的真实作用，以及其在恢复过程中的发病率。

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