由于大洪水和沉积物重新悬浮到一个大型沿海海域而导致的气负载
Alistair Grinham1, Tony Costantini2, Nathaniel Deering1
1School of Civil Engineering, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia.
The Science of the total environment
|February 7, 2024
概括
莫雷顿湾的大洪水造成了广泛的细沉积物沉积,显著增加了负荷,威胁到生态系统的健康. 这项研究量化了洪水带来的沉积物对整个湾的营养动态的长期影响.
科学领域:
- 环境科学 环境科学
- 海洋生态海洋生态学
- 沿海的地质形态学
背景情况:
- 大洪水通过沉积物窒息和营养物质负载严重影响沿海环境,降低环境健康和生态系统服务.
- 莫雷顿湾是一个亚热带海域,面临着洪水事件影响其独特生态系统和服务的威胁.
研究的目的:
- 评估2022年2月大洪水对莫雷顿湾泥范围和沉积物流的短期和长期影响.
- 量化洪水产生的细沉积物对海湾表面水中的负荷的贡献.
主要方法:
- 通过地表水采样 (47个地点) 评估的短期影响,洪水发生后三天.
- 通过广泛的沉积物调查 (223个地点) 和使用沉积物核心的营养流体实验来评估长期影响.
- 营养流体实验模拟了四个主要沉积物类的平静和再悬浮条件.
主要成果:
- 在莫雷顿湾观察到高度,在布里斯班河口达到顶峰;和酸盐度显示出与度相关的明显模式.
- 在98%的海湾确认了细沉积物沉积,孔水含有大量的氨池.
- 沉积物流量在沙泥和再悬浮条件下显著高于沉积物流量,估计平均年流量为17700.
结论:
- 50多年来大洪水的细沉积物输送影响了莫雷顿湾98%以上的盆地区域.
- 洪水产生的沉积物是气进入莫雷顿湾地表水域的主要途径.
- 这种持续的沉积物和营养物质负载对莫雷顿湾的整体生态系统健康构成重大威胁.
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