CHANGES IN SUSPENDED-MATTER FLOC SIZE DURING THE TIDAL CYCLE IN THE DOLLARD ESTUARY
CHANGES IN SUSPENDED-MATTER FLOC SIZE DURING THE TIDAL CYCLE IN THE DOLLARD ESTUARY
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DOI：
10.1016/0077-7579(93)90001-9
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发表时间：
1993-07-01
期刊：
影响因子：
--
通讯作者：
LI, A
中科院分区：
文献类型：
--
作者：
EISMA, D;LI, A
对多拉德（荷兰瓦登海）潮汐通道中悬浮物颗粒尺寸的原位测量表明，潮汐周期期间絮凝体尺寸存在系统变化，这可以通过假定平潮期间沉降、早退潮和早洪水期间重新悬浮、在大部分潮汐期间细颗粒絮凝成大颗粒以及沉降到底部期间或之后大絮凝体反絮凝成较小颗粒来解释。退潮期间和洪水期间絮体尺寸变化存在特征差异。在落潮期间，最大絮凝体尺寸与最大悬浮物浓度（最大碰撞频率）一致；在洪水期间，最大絮体尺寸继续向高水位平潮方向增加。邻近的潮滩对絮体尺寸有显着影响：在潮滩较小的地方，大絮体 (>128 mum) 的比例最高出现在平潮前后，当时流速较低。如果相邻的公寓又宽又大，那么中间时期的比例也很高。最大尺寸的絮凝体可能不与大部分悬浮物质保持平衡：它们主要是在短期内悬浮物质浓度较高的时期形成的。
Measurements of in situ particle size of suspended matter in a tidal channel in the Dollard (Dutch Wadden Sea) indicated systematic variations in floc size during the tidal cycle that can be explained by assuming settling during slack tide, resuspension during the early ebb and early flood, flocculation of fine particles into large ones during most of the tide, and deflocculation of large flocs into smaller particles during or after settling to the bottom. There was a characteristic difference in floc-size variation during ebb and during flood. During the ebb maximum floc size coincided with maximum suspended-matter concentration (maximum collision frequency); during the flood maximum floc size continued to increase towards high-water slack tide. The adjacent tidal flats had a marked influence on floc size: where the flats were small, the highest percentages of large flocs (>128 mum) occurred around slack tide when current velocities are low. Where the adjacent flats were broad and extensive, high percentages also occurred during intermediate periods. Flocs of maximum size are probably not in equilibrium with the bulk of the suspended matter: they are mainly formed during periods of high suspended-matter concentrations of short duration.