...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Observation of the sediment trapping during flood season in the deep-water navigational channel of the Changjiang Estuary, China
【24h】

Observation of the sediment trapping during flood season in the deep-water navigational channel of the Changjiang Estuary, China

机译：长江口深水航道汛期泥沙截留的观测

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

After the construction of the Deep-water Navigational Channel (DNC) in the North Passage of the Changjiang Estuary, siltation in the channel became severe during the flood season in the navigation channel. To investigate the causes, field observations of tidal current, salinity and suspended sediment concentration (SSC) were conducted by 16 anchored boats in the navigation channel of North Passage during spring tide in the flood season. The across-channel differences of salinity, SSC, and near bottom residual sediment transport at the high siltation area of the DNC were observed and analyzed. The results show that the near bottom SSC presented a south-to-north decreasing trend during the flood tide at the lower reach of the North Passage. During the ebb tide, a suspended sediment cloud of extremely high concentration was detected within the channel. The observed longitudinal sediment trapping was not only shown as the turbidity maximum (TM) trapped within the moving salinity front but also as the longitudinal convergence of the residual sediment transport at the middle reach. The mechanism for the longitudinal sediment trapping was due to the tidal asymmetry in mixing. The observed lateral sediment trapping was prominent at the most severe siltation area of the DNC in the section #2. The lateral sediment trapping at the across-channel section #2 was not only shown as the lateral transport of the sediments from the channel flanks during the flood slack but also as the lateral convergence of the residual sediment transport during the entire spring tidal cycle. The mechanism for the lateral sediment trapping was dominated by the advective transport. The lateral impact on the channel sediment trapping was not negligible in view of the depth-mean lateral tidal straining on the water stratification. The observed convergences of both the longitudinal and the lateral residual sediment transports were responsible for the severe channel siltation in the North Passage.
机译：长江口北通道深水航道（DNC）建成后，航道汛期航道淤积严重。为了调查原因，在洪水季节的春季潮汐期间，在北通道航道中的16艘锚船对潮汐流，盐度和悬浮沉积物浓度（SSC）进行了现场观察。观察并分析了DNC高淤积区盐度，SSC和近底残渣输运的跨通道差异。结果表明，在北航道下游河段洪水期间，近底部海南南北呈现南北向下降的趋势。在退潮期间，在河道内检测到浓度很高的悬浮沉积云。观察到的纵向泥沙截留不仅显示为移动的盐度前沿内截留的最大浊度（TM），而且还显示为中游残留泥沙输送的纵向收敛。纵向泥沙截留的机理是由于混合中的潮汐不对称。在第2部分中，在DNC最严重的淤积区域观察到的侧向泥沙截留是突出的。跨通道段＃2的侧向沉积物捕获不仅表现为洪水泛滥期间来自河道侧面的沉积物的横向运移，而且还表现为整个春季潮汐周期中残余沉积物运移的横向收敛。平流运移是侧向泥沙截留的主要机制。鉴于对水分层的深度平均横向潮汐应变，对河道沉积物截留的横向影响不可忽略。纵向和横向残余沉积物运移的观测收敛是造成北通道严重淤积的原因。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号