在过去二十年中,全球河流三角洲附近悬浮沉积物持续增加
Xuejiao Hou1,2, Danghan Xie2,3, Lian Feng4
1School of Geospatial Engineering and Science, Sun Yat-Sen University, Guangzhou, China.
Nature communications
|April 18, 2024
概括
全球河流三角洲显示海岸悬浮沉积物度 (SSC) 和羽毛积 (RPA) 的增加. 这为海平面上升所面临的三角洲湿地提供了潜在的弹性,尽管长期持久性不确定.
科学领域:
- 地球和环境科学 地球和环境科学
- 海洋学 海洋学 海洋学
- 沿海的地形形态学
背景情况:
- 河流沉积物对三角洲湿地健康至关重要.
- 河流沉积物供应的减少引发了对湿地生存的担忧.
- 沿海悬浮沉积物在三角洲附近的动态尚不清楚.
研究的目的:
- 评估沿海悬浮沉积物度 (SSC) 和河流沉积物羽毛面积 (RPA) 的全球模式.
- 调查沿海SSC和RPA的驱动因素和趋势.
- 了解沿海SSC对河流沉积物供应变化的反应.
主要方法:
- 对2000年至2020年全球349个三角洲的卫星图像进行分析.
- 沿海悬浮沉积物度 (SSC) 趋势的量化.
- 测量河流沉积物羽毛面积 (RPA) 的变化.
主要成果:
- 观察到沿海SSC (+0.46%年−1) 和RPA (+0.48%年−1) 的总体增加.
- 超过59%的三角洲同时增加了SSC和RPA.
- 亚洲是唯一没有普遍的SSC和RPA增加的大陆.
- 45.2%的三角洲呈现了河流沉积物供应和沿海SSC之间的相反趋势.
结论:
- 沿海SSC和RPA在全球范围内正在增加,为湿地弹性提供了潜在的积极前景.
- 诸如潮,波浪,盐度和三角洲形态等因素影响了SSC-河流沉积物关系.
- 增加沿海SSC的湿地适应力的长期可持续性仍然不确定.
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