Lockington James R, Albert Simon, Fisher Paul L, Gibbes Badin R, Maxwell Paul S, Grinham Alistair R
School of Civil Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.
Health Waterways, 200 Creek Street, Spring Hill, Brisbane, QLD, Australia.
Mar Pollut Bull. 2017 Mar 15;116(1-2):491-497. doi: 10.1016/j.marpolbul.2016.12.029. Epub 2016 Dec 28.
Major flood events can dramatically alter the coastal sediment environment. This study established the current sediment distribution in a large sub-tropical embayment, Moreton Bay, Australia, and examined the effect of three recent floods on modifying this distribution. In 2015, surface sediment samples were collected from 223 sites across the study area and analysed for particle size distribution with the resultant sediment distribution mapped. In addition, sampling of flood waters during two major events in 2011 and 2013 was undertaken and particle size distribution of suspended sediment was determined. Data was compared to the result of an earlier large-scale survey completed in 1970, with three large flood events occurring between the two surveys. The sediment environment has undergone a dramatic change with muddy sediments now covering an estimated area of over 860km, more the double the area found in 1970. Mud is now the dominant sediment type within Moreton Bay.
重大洪水事件可极大地改变沿海沉积物环境。本研究确定了澳大利亚莫顿湾这个大型亚热带海湾当前的沉积物分布情况，并研究了最近三次洪水对这种分布的改变作用。2015年，在整个研究区域的223个地点采集了表层沉积物样本，并分析了粒径分布情况，绘制出了沉积物分布地图。此外，还对2011年和2013年两次重大事件期间的洪水进行了采样，并测定了悬浮沉积物的粒径分布。将这些数据与1970年完成的一项早期大规模调查结果进行了比较，两次调查之间发生了三次大洪水事件。沉积物环境发生了巨大变化，现在估计有超过860平方公里的区域被泥质沉积物覆盖，面积是1970年发现区域的两倍多。现在，泥质是莫顿湾内主要的沉积物类型。
