...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Convergence of lateral flow along a coastal plain estuary
【24h】

Convergence of lateral flow along a coastal plain estuary

机译：沿沿海平原河口的侧向流汇聚

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

A set of velocity profiles obtained in the James River estuary with an acoustic Doppler current profiler was used in combination with the results of an analytic tidal model to depict the appearance of surface lateral flow convergences (av lar) during both flood and ebb stages of the tidal cycle. The bathymetry of the estuary was characterized by a main channel and a secondary channel separated by relatively narrow shoals. Lateral surface flow convergences appeared over the edges of the channels and were produced by the phase lag of the flow in the channel relative to the shoals. Flood convergences developed in the late tidal stages and ebb convergences appeared soon after maximum currents. Most of these convergences caused fronts in the density field and flotsam lines that also appeared over the edges of the channel and that lasted <2 hours. The transverse flows associated with the convergences were mostly in the same direction throughout the water column. Ln fact, the vertically averaged flow produced the same convergence patterns as those near the surface. The analytic tidal model reproduced well the timing and location of the convergences as observed in the James River. Model results with different bathymetry emulated the results in other estuaries, e.g., axial convergence in an estuary with a channel in the middle. This work showed that the strength of lateral convergences along the estuary was proportional to the tidal amplitude and the channel steepness. It also suggested that the convergences were produced mainly by the tidal flow interacting with the channel-shoal bathymetry, i.e., that they did not require the presence of density gradients. However, the analytic model underestimated the magnitude of the convergences and did not account for vertical circulations associated with fronts. The formation of fronts resulted from the interaction of the tidal flow with the bathymetry and the density field. [References: 24]
机译：结合声波多普勒电流剖面仪在詹姆斯河河口获得的一组速度剖面与分析潮汐模型的结果结合使用，描述了洪水泛滥和退潮阶段表面横向流汇聚的出现。潮汐周期。河口的测深法的特征是主河道和次河道被相对较窄的浅滩隔开。横向水流会聚出现在河道的边缘，是由于水流相对于浅滩的相位滞后而产生的。潮汐收敛在潮汐后期发展，潮汐收敛在最大水流之后很快出现。这些收敛大部分导致了密度场的前沿和漂浮物线，它们也出现在通道的边缘，持续了不到2小时。在整个水柱中，与会聚相关的横向流大多在同一方向上。实际上，垂直平均流产生的收敛模式与表面附近的收敛模式相同。解析潮汐模型很好地再现了詹姆斯河中观测到的收敛时间和位置。具有不同测深法的模型结果模拟了其他河口的结果，例如，河口中部有通道的轴向收敛。这项工作表明，沿河口的侧向收敛强度与潮汐振幅和河道陡度成正比。还表明收敛主要是由潮汐流与河道浅滩测深法相互作用产生的，即它们不需要密度梯度。但是，分析模型低估了收敛的幅度，并且没有考虑与前沿相关的垂直环流。锋面的形成是潮汐流与测深法和密度场相互作用的结果。 [参考：24]

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