51年来,阿尔达布拉环礁上升的海岸线平均变化率较低
Annabelle Constance1,2, Nancy Bunbury3,4, Natalie Lack5
1Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland. constanceannabelle@hotmail.com.
阿尔达布拉环礁表现出对海平面上升的弹性,保持了海岸线和陆地面积. 了解地球形态过程是保护珊瑚礁岛屿适应潜力的关键.
科学领域:
- 地质形态学 地质形态学
- 沿海科学 沿海科学
- 生态生态学 生态生态学
背景情况:
- 由于海平面上升和珊瑚礁沉积物供应减少,环礁面临物理适应挑战,增加了珊瑚礁岛屿的侵蚀.
- 阿尔达布拉环礁,一个起的环礁和联合国教科文组织世界遗产,为检查各种沿海生态系统的海岸线动态提供了一个独特的案例研究.
研究的目的:
- 评估51年来阿尔达布拉环礁海岸线的变化,以应对区域海平面上升 (2-3毫米/年-1).
- 为了比较一个高的环礁的地形学过程与低礁岛的地形学过程,并评估阿尔达布拉的适应能力.
主要方法:
- 分析了1960年和2011年的空中和卫星图像,覆盖了阿尔达布拉海岸线的85%.
- 应用数字海岸线分析系统来量化海岸线变化和侵蚀/积累率.
主要成果:
- 阿尔达布拉海岸线的61%在51年内保持稳定;24%的变化平均为0.25 ± 0.36 m yr-1 .
- 积累和侵蚀速度几乎平衡,每个都影响了海岸线的12%,局部发生了重大变化,包括红树林的扩张.
- 湖海岸线表现出比海洋海岸线更具动态性的变化,特别是在暴露的区域.
结论:
- 阿尔达布拉环礁展示了海岸线的稳定性,并保持了其陆地面积,表明了相当大的适应能力,类似于其他印度太平洋环礁.
- 低珊瑚礁岛上的地形学过程可转移到像阿尔达布拉这样的高环礁,证实了类似的岛屿形成机制.
- 尽量减少对沉积物动态的局部影响对于保护珊瑚礁岛屿适应潜力至关重要;持续监测对于保护战略至关重要.
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