童朝锋, 郑联枭, 孟艳秋, 时健. 兴化湾悬沙输移机理分析[J]. 水利水运工程学报, 2016, (2): 1-10.
引用本文: 童朝锋, 郑联枭, 孟艳秋, 时健. 兴化湾悬沙输移机理分析[J]. 水利水运工程学报, 2016, (2): 1-10.
TONG Chao-feng, ZHENG Lian-xiao, MENG Yan-qiu, SHI Jian. Mechanism of suspended sediment transport in Xinghua bay[J]. Hydro-Science and Engineering, 2016, (2): 1-10.
Citation: TONG Chao-feng, ZHENG Lian-xiao, MENG Yan-qiu, SHI Jian. Mechanism of suspended sediment transport in Xinghua bay[J]. Hydro-Science and Engineering, 2016, (2): 1-10.

兴化湾悬沙输移机理分析

Mechanism of suspended sediment transport in Xinghua bay

  • 摘要: 隧道工程所在位置河床的最大冲刷深度是过江隧道方案设计的关键参数之一,合理确定最大冲刷深度能为保证工程安全和减少投资提供重要设计依据。在分析近年来河道演变特点和前人所做研究的基础上,以长江下游仪征水道世业洲河段拟建过江隧道为例,分析工程河段的来水来沙特点,采用二维水流泥沙数学模型对不同水文年条件下河段河床最大冲刷深度进行了研究。在验证模型水流和泥沙冲淤相似的前提下,确定了动床模拟的不利水沙系列为2007—2010年+1998年+300年一遇洪水流量过程,并结合地质勘测资料对模拟结果进行了合理预测。最终确定过江隧道断面河床左汊最大冲深为10.85 m,右汊最大冲深为8.87 m,该结果对拟建过江隧道工程而言偏于安全。

     

    Abstract: Based on the calculation of the tide and sediment data measured in the Xinghua bay by use of the mechanism decomposition method, the characteristics of the suspended sediment transport in the Xinghua bay have been illustrated through exploring the mechanism of the advection, tidal pumping effects and the vertical circulation for sediment transport, and the impacts of the sediment transport on the topographic changes in the study area have been discussed in this paper. The analysis results show: offshore sediment moves toward the inner of the bay along the Xinghua and Nanri channels under the action of tide, but it has little influence on the sedimentation in the inner of the bay. The advection and the vertical circulation are the primary factors for the suspended sediment transport, and the sediment transport in the deeper region is mainly controlled by the advection while the vertical circulation has a stronger impact in the shallow regions. The sediment transport under tidal pumping effect is dominated by the correlation between the suspended sediment and the tidal current, which is less than the sediment transport caused by the advection and the vertical circulation. The residual current directions are inconsistent in different vertical layers in the shallow estuary region, which causes the suspended sediment to mix well. The directions of the residual current in the surface and bottom layers are basically the same in the deeper region, and the vertical sediment concentration changes significantly. The deposition in the top of the bay is caused by the sediment transport. The main cause of the changes in the gulf topography is terrigenous sediment.

     

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