In situ flume measurements of resuspension in the North Sea
In situ flume measurements of resuspension in the North Sea
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北海再悬浮的原位水槽测量
DOI：
10.1016/j.ecss.2011.05.026
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Thompson C
中科院分区：
文献类型：
--
作者：
Thompson C
在北海的三个地点部署了原地环形水槽“旅行者二号”，以调查再悬浮事件，确定海底的物理特性，确定海床再悬浮的阈值，并量化侵蚀速率和侵蚀深度。这是第一个受控的，原位水槽实验，研究再悬浮在北海，并结合长期测量的波浪和电流。再悬浮实验在两个泥泞的地方进行，一个桑迪：Dogger Bank北部（DG：水深约80米，非常细，分选不良，非常细的倾斜沉积物，沿着水体季节性热分层，并伴有氧气耗尽）;牡蛎场（OG：40米，相似的床层特性，全年水柱热分层，大西洋强迫）;以及在Sean气田（SGF：20米，中等分选，非常粗的斜砂，以及混合良好的水柱）。试验期间床面的冲刷阈值分别为0.66-1.04Pa（DG）和0.91-1.27Pa（OG），相应的冲刷深度分别为0.1-0.15mm和0.02-0.06mm。对2007年以来一年流速的评估表明，在OG，由于短期（<30分钟）潮汐强迫，固结床的再悬浮平均仅限于1.8%的时间，但由于波浪影响，冬季可能会增加。在DG，在类似的条件下，这将增加到13%，并在SGF，波浪引起的再悬浮事件发生在全年，与潜在的悬浮阈值大于50%，在1月和3月。再悬浮床料和侵蚀速率密切相关的床面剪切应力，侵蚀深度显着相关的物理性质的床。因此，虽然地球物理因素的复杂变化影响到侵蚀的临界阈值，但一旦超过阈值，侵蚀速率与沉积物的性质有关。
The in situ annular flume, Voyager II, was deployed at three sites in the North Sea in order to investigate resuspension events, to determine the physical characteristics of the seabed, to determine the threshold of resuspension of the bed and to quantify erosion rates and erosion depths. These are the first controlled, in situ flume experiments to study resuspension in the North Sea, and were combined with long-term measurements of waves and currents. Resuspension experiments were undertaken at two muddy, and one sandy site: north of the Dogger Bank (DG: water depths ∼80m, very fine, poorly sorted, very fine-skewed sediment experiencing seasonal thermal stratification of the water column along with oxygen depletion); the Oyster Grounds (OG: ∼40m, similar bed properties, year round water column thermal stratification, Atlantic forcing); and in the Sean Gas Field (SGF: ∼20m, moderately sorted, very coarse-skewed sand, and well mixed water column). The erosion thresholds of the bed were found to be 0.66–1.04Pa (DG) and 0.91–1.27Pa (OG), with corresponding erosion depths of 0.1–0.15mm and 0.02–0.06mm throughout the experiments. Evaluation of a year of current velocities from 2007 indicated that at OG, resuspension of the consolidated bed was limited to on average ∼8% of the time as a result of tidal forcing alone for short (<30min) durations, but would potentially increase during the winter as a result of wave influences. At DG, under similar conditions this would increase to 13%, and in the SGF, wave-induced resuspension events occurred throughout the year, with the potential exceedance of the threshold for suspension greater than 50% in January and March. Resuspension of bed material and erosion rates were closely related to applied bed shear stresses, and eroded depths were significantly correlated with the physical properties of the bed. Therefore, while complex variations in biogeophysical factors affected the critical threshold of erosion, once exceeded, erosion rates were related to the nature of the sediment.
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DOI：
10.1029/2007eo470014
发表时间：
2007-11
期刊：
Eos, Transactions American Geophysical Union
影响因子：
--
作者：
T. Bianchi
通讯作者：
T. Bianchi
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
C. Chen
通讯作者：
C. Chen
影响因子：
2.3
作者：
E. Stanev;M. Dobrynin;A. Pleskachevsky;S. Grayek;H. Günther
通讯作者：
E. Stanev;M. Dobrynin;A. Pleskachevsky;S. Grayek;H. Günther
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DOI：
10.1080/00785326.1995.10431514
发表时间：
1995
期刊：
Ophelia
影响因子：
--
作者：
P. Tett;A. Walne
通讯作者：
A. Walne
波罗的海和北海：一些重要的物理化学生物相互作用过程的区域回顾（20，S）
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
J. Rodhe
通讯作者：
J. Rodhe