Sediment dynamics and deposition in a retreating coastal salt marsh
Sediment dynamics and deposition in a retreating coastal salt marsh
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退缩的沿海盐沼中的沉积物动力学和沉积
DOI：
10.1016/0272-7714(88)90012-1
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发表时间：
1988
影响因子：
2.8
通讯作者：
D. Reed
中科院分区：
文献类型：
--
作者：
D. Reed
英格兰东南部埃塞克斯郡登吉半岛上的布里奇克里克的当地相对海平面上升速度约为3毫米年−1，但由于淹没程度增加，盐沼植被没有显示出压力的迹象，表明沼泽表面继续堆积。来自航空摄影的证据表明，自1955年以来，沼泽前缘已经后退了40多米。对大潮和小潮的流速和悬浮泥沙浓度的监测表明，净通量的大小和方向都有很大的变化。这是由于在某些潮流条件下，流速状态的变化和小溪系统内泥沙的夹带而造成的。在两年的时间里测量的沼泽表面的淤积模式表明，从沼泽边缘侵蚀的沉积物在局部地区比通过小溪系统输送的沉积物在淤积中更重要。对整个沼泽系统内沉积物的动态进行了研究，它们的重要性与维持相对海平面上升地区的盐沼有关。
The local rate of relative sea-level rise at Bridge Creek on the Dengie Peninsula in south-east Essex, England is approximately 3 mm year−1, but the salt marsh vegetation shows no sign of stress due to increased submergence indicating continued accretion of the marsh surface. Evidence from aerial photography shows that the marsh front has retreated by over 40 m since 1955. Monitoring of current velocity and suspended sediment concentrations over both spring and neap tides shows great variability in both the magnitude and direction of net flux. This is explained by changes in the velocity regime and the entrainment of sediment from within the creek system during certain tidal flow conditions. The accretion pattern on the marsh surface, measured over a two-year period, indicates that sediment eroded from the marsh edge is locally more important in accretion than that delivered via the creek system. The dynamics of sediment within the marsh system as a whole are examined, and their importance related to the maintenance of salt marshes in areas subjected to relative sea-level rise.