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首页> 外文会议>2014 IEEE/OES Baltic International Symposium : Measuring and modeling of multi-scale interactions in the marine environment: Book of abstracts >Modeling of sediment resuspension in Neva Bay during strong wind events
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Modeling of sediment resuspension in Neva Bay during strong wind events

机译：内娃湾强风期间泥沙重悬的模拟

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Wind waves play the major role in the bottom sediments resuspension in coastal areas. However, the available results of field observations imply that only the consideration of the combined effect of currents and wind waves can give correct model estimates of resuspension intensity. In present study a three-dimensional circulation model of Neva Bay (Gulf of Finland, Baltic Sea) was used to simulate the bottom sediments resuspension due to currents and wind waves. The characteristics of wind waves are calculated from the wave model SWAN. They are then used to calculate the bottom shear stress resulting from the nonlinear wave-current interaction. The resuspension model takes into account the difference in physical characteristics of two main bottom sediments in Neva Bay: sand and silt, with a possibility to also allow for the presence of clay fraction. The variable sinking velocity of suspended particles is used, account being taken of the effects of settling velocity reduction due to high concentrations called hindered settling, and flocculation. The model also takes into account cohesion and packing effects of the bottom sediments. Satellite images with total suspended matter (TSM) data were used to calibrate the resuspension model. Also the results of model runs aimed at estimating the intensity and frequency of resuspension events during extremely strong winds in 2008 over the Neva Bay are presented. The model runs carried out for the ice-free period from May 1 until November 30 have shown that the significant resuspension events in Neva Bay occurred during autumn from the end of September until the end of November and were caused mainly by strong western winds.
机译：风浪在沿海地区的底部沉积物再悬浮中起主要作用。但是，现场观测的可用结果表明，仅考虑电流和风浪的综合作用才能给出正确的重悬强度模型估算值。在本研究中，使用了涅瓦湾（芬兰湾，波罗的海）的三维循环模型来模拟由于洋流和风浪引起的底部沉积物再悬浮。根据波浪模型SWAN计算风浪的特征。然后将它们用于计算由非线性波流相互作用产生的底部切应力。重悬模型考虑了内娃湾两种主要底部沉积物的物理特征的差异：沙子和淤泥，并且还可能存在粘土部分。考虑到由于高浓度而导致的沉降速度降低的影响（称为阻碍沉降和絮凝），使用了悬浮颗粒的可变沉降速度。该模型还考虑了底部沉积物的内聚和堆积效应。具有总悬浮物（TSM）数据的卫星图像用于校准重悬浮模型。此外，还给出了模型运行的结果，旨在估算内娃湾在2008年极端强风期间的重悬浮事件的强度和频率。从5月1日至11月30日的无冰期进行的模型运行表明，涅瓦湾的重大悬浮事件发生在9月底至11月底的秋季，主要是由强西风引起的。

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