Variation in Surface Sediment Deposition on Salt Marshes in the Bay of Fundy
Variation in Surface Sediment Deposition on Salt Marshes in the Bay of Fundy
复制标题
芬迪湾盐沼表面沉积物沉积变化
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
R. Crago
中科院分区：
文献类型：
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作者：
G. Chmura;A. Coffey;R. Crago
本研究的目的是记录的幅度和变化的表面沉积物沉积在盐沼沿着的新玩法海岸的芬迪湾。我们测量了一年期间在粘土标志层上积累的沉积物的厚度。从湾头到外湾，在7个地点对沉积物进行了采样，分布在潮差（6-12米）的梯度上。在每个沼泽样地位于控制相对海拔，距离植被边缘，植被带。在某些地块上，累积的沉积物大于4厘米。沉积物累积通常随着相对海拔和距沼泽内植被边缘的距离而减少，并随着潮差而增加，潮差往往与悬浮沉积物浓度协变。我们的结论是，沉积物供应的变化将有最大的影响低沼泽增生，而海平面或沼泽水文的变化将是最重要的高沼泽增生。
The purpose of this study is to document the magnitude and variability in surface sediment deposition in salt marshes along the New Brunswick coast of the Bay of Fundy. We measured the thickness of sediment accumulated over clay marker horizons for the period of one year. Sediments were sampled at seven sites from the head of the Bay to the outer Bay, distributed to span a gradient in tidal range (6-12 m). Within each marsh sample plots were located to control for relative elevation, distance from vegetated edge, and vegetation zone. Accumulated sediment was greater than 4 cm on some plots. Sediment accumulation generally decreases with relative elevation and distance from vegetated edge within marshes and increases with tidal range, which tends to co-vary with suspended sediment concentration. We conclude that changes in sediment supply will have the greatest impact on low marsh accretion while changes in sea level or marsh hydrology will be most important to high marsh accretion.